370results about How to "No health hazard" patented technology

The invention discloses a simulated fat. The base material for preparing the simulated fat comprises konjaku flour and carrageenin of which the compound weight ratio is 1:0.3-0.45, and the auxiliary material comprises egg white protein, a defoamer, alkaline gel and water. The simulated fat is prepared by using compounded vegetable glue as the base material assisted by the egg white protein and vegetable oil through the steps of stirring with the water, molding, precooking, forming, cooling, mould unloading, recooking and secondary cooling under the action of the gel. The simulated fat product has a plurality of physical characteristics similar to natural fat and has no health hazards. The simulated fat can be used as a substitute in meat products processing and is widely applied to the meat products processing. Sausages, hamburger bakemeat and the like processed from the simulated fat are completely same with animal fat from the appearance and the cross section, have quite similar mouthfeel and flavor and low fat, are rich in dietary fiber, and do not contain cholesterol.

The invention relates to a preparation technique of freeze-dried fermented glutinous rice, which comprises the following steps: elutriating glutinous rice to remove impurities, and soaking; boiling, and cooling to 28-30 DEG C; dispersing, evenly spreading, adding sterilized water, adding distillery yeast, evenly mixing, and fermenting; after finishing fermentation, carrying out solid-liquid separation, pre-freezing the solid part, and carrying out vacuum freeze-drying and vacuum packaging; and carrying out microwave sterilization and vacuum packaging on the liquid part. In the invention, the solid part is subjected to vacuum freeze-drying, so that the original quality of the material is maximally maintained, and the storage time of the freeze-dried fermented glutinous rice is longer. The sweet wine is subjected to microwave sterilization, so that the growth and development of microbes in the sweet wine are postponed, and the microbes can even die, thereby effectively protecting the massive effective constituents in the sweet wine from damage, and maintaining the original shape, color, flavor and nutritional ingredients of the product; and the freeze-dried fermented glutinous rice has the characteristics of energy saving, consumption reduction, no harm to human health, and favorable rehydration property. The technique provided by the invention is simple and convenient to operate; the prepared fermented glutinous rice is free of preservative, has the advantages of no loss of nutritional ingredients, good flavor and long storage time, and is convenient and quick to eat; and the invention is applicable to industrial production.

The invention discloses tea preserved fruit and a preparation method thereof. The tea preserved fruit is prepared from the following raw materials in part by weight: 1 to 10 parts of tea soup, 0.1 to 10 parts of fresh fruit, 0.1 to 10 parts of xylitol, 0.1 to 3 parts of fructooligosaccharide, 0.1 to 5 parts of honey and 0.1 to 1 part of salt. The preparation method comprises the following steps of: crudely smashing a tea raw material and soaking the material in boiled water to prepare the tea soup (the weight ratio of the tea to water is 1:2-10); adding the xylitol, the fructooligosaccharide and the honey into the tea soup and fully dissolving the mixture to prepare sugar soaked solution for later use; cleaning the fresh fruit; blanching the cleaned fruit; salting the blanched fruit; soaking the salted fruit in VC solution and putting the soaked fruit into the sugar soaked solution; soaking the soaked fruit in the sugar soaked solution in vacuum; rinsing the sugar soaked fruit; drying the rinsed fruit at a low temperature; sterilizing the dried fruit; and packaging the sterilized fruit in vacuum to prepare the tea preserved fruit. The tea preserved fruit combines tea flavor with fruit flavor, completely keeps effective ingredients, has nutrient health-care ingredients of the tea and the fresh fruit, improves the mouthfeel of the fresh fruit, overcomes the defect of high sugar content of conventional preserved fruit and has more scientific and reasonable raw material blending. The preparation method is simple and practical.

The invention provides a silicane modified polyurethane cementing sealing glue and method for making same, which comprises end hydroxy polyether 20-45, isocyanate 3-10, plasticizer 15-38, mineral filler 15-50, silicane coupling agent 0.01-0.1 catalyst 0.01-0.3, anti-oxidant 0.01-0.2. The invention also discloses the process of preparation.

The invention relates to a low-temperature anti-crystalized structural adhesive and a preparation method thereof. The structural adhesive is prepared by mixing an A component and a B component according to the weight ratio of 2 to 1, wherein the A component consists of bisphenol A epoxy resin, bisphenol F epoxy resin, a glycidyl ether diluent, a flexibilizer, a coupling agent, a fumed silica thixotropic agent and fillers; the B component comprises an alicyclic amine curing agent, an accelerant, a fumed silica thixotropic agent and fillers. According to the low-temperature anti-crystalized structural adhesive, the bisphenol A epoxy resin and bisphenol F epoxy resin are compounded for use, and the diluent containing polyfunctional groups is adopted, so that not only can a good dilution effect be achieved, but also the usage amount of the bisphenol F epoxy resin can be reduced so as to prevent the crystallization of the epoxy resin; the viscosity and shrinkage can be reduced, and therefore the production cost is lowered; the preparation method is simple and feasible, no volatile substances are generated during production, and the low-temperature anti-crystalized structural adhesive is a green and environment-friendly building material and has no harm to the health of production personnel and users.

The invention discloses preparation of coated sand by the use of a phosphate inorganic binder and a molding method thereof. Preparation of the coated sand comprises the following steps: uniformly mixing the phosphate inorganic binder and quartz sand; heating and drying to a semi-dry state; adding calcium stearate with the granularity being 600 meshes and uniformly mixing; and drying and cooling so as to obtain the phosphate inorganic binder coated sand which is in a dry arenaceous state. During molding of the coated sand, the coated sand undergoes hydration only by high temperature steam, the binder is dissolved, sand grains are connected, and finally hot-air is blown for drying and curing molding. The hardening speed is fast. During preparation and curing molding of the coated sand, smell or any harmful gas or substance is not generated. The sand mould has low gas-forming property, is harmless to the health of workers, causes no pollution to the environment and is energy-saving and environmentally friendly. The coated sand provided by the invention has characteristics of high strength, high temperature resistance, low gas evolution, no curing agent required for molding and good storage stability.

The invention discloses an inflaming-retarding flexible heat preservation facing material in building and a preparing method thereof, which is prepared from the following components in part by weight: 1-50 parts of soil particles, 1-50 parts of hollow filler, 1-10 parts of reinforced fibers, 10-50 parts of flexible emulsion, 0-1 part of pigment, 1-10 parts of accessory ingredient and 10-40 parts of water, that are mixed to form slurry with appropriate viscosity, are formed in a template with decorative patterns, so as to prepare a composite material with functions of inflaming retarding, heat preservation and decoration after gradient temperature control, drying and demoulding. According to the invention, the production process is environmental-friendly, the construction process is simple, convenient and feasible, and the inflaming-retarding flexible heat preservation facing material in building is particularly suitable for external facing of high-rise buildings and old town transformation.

The invention discloses a super-hydrophilic oil water separation net film with antifouling and antibacterial functions and preparation as well as application thereof. The net film is provided with a special three-layer structure, and is formed by a water-sensitive agent bottom layer, a crosslinking agent interlayer and a super-hydrophilic ternary polymer surface layer; a super-hydrophilic ternary polymer at the outermost layer is obtained by polymerizing three monomers of HEA, SPP and DMHB through a water solution, and adopted raw materials and a reaction system (water) are environment-friendly, cannot cause secondary pollution, and also cannot infect the health of an operator. In the super-hydrophilic ternary polymer, long carbon chain quaternary ammonium salt groups of the DMHB exist and can effectively kill bacteria, and meanwhile SPP glycine betaine groups simultaneously having positive and negative charges also exist and can effectively prevent molecular adsorption of protein and the like. The net film is stable in film layer structure, can better keep super hydrophilicity and antifouling and antibacterial properties, and can be applied to treatment of oily wastewater.

The invention provides a method for leaching vegetable fat with dimethly carbonate (DMC), comprising the following steps of: screening, drying, crushing and feeding oil plant seeds into an extracting tank; adding solvent of dimethly carbonate (DMC) and leaching; subjecting the leaching mixture to the reduced pressure filtration to separate out mixed oil and seed meal; subjecting the mixed oil to the reduced pressure distillation under the protection of the nitrogen gas and recovering the solvent and simultaneously obtaining fat with clear color and no off flavor; and repeatedly leaching the recovered seed meal and the solvent for 1-4 times until the oil is not generated any longer after the reduced pressure distillation. According to the process for leaching vegetable fat, the green solvent of dimethly carbonate (DMC) with high safety is taken as the solvent, so that the leached vegetable fat more meets the requirement of food safety, has no harm to operators exposed in the productionenvironment and no pollution to the environment, thus the danger in the production is reduced.

The invention relates to a plant wound healing agent containing sodium alginate oligosaccharide. The healing agent contains 0.001%-0.02% of sodium alginate oligosaccharide and one or more of a resistance inducer, a nutrient, a bactericide, a pesticide and a film forming agent. The plant wound healing agent can be used for spraying or smearing. The plant wound healing agent is used for treating wounds before and after trimming, girdling or grafting, so that the morbidity of the wounds can be reduced, and the healing of the wounds can be promoted. The plant wound healing agent is applicable to fruit trees and flowers.

The invention relates to a body posture training method. According to the method, after action key frames of a coach and action key frames of a learner are collected, action video data of the coach and action video data of the learner are collected, then a DTW algorithm is used first to make an action video of the coach and an action video of the learner consistent in duration and time sequence, afirst feature plane set based on the action key frames of the coach and a second feature plane set based on the action key frames of the learner are established, and the action key frames of the coach are matched with the action key frames of the learner through comparison of an included angle between normal vectors of the first feature plane set and an included angle between normal vectors of the second feature plane set; and then an included angle between edge vectors in the second feature plane set is acquired through detailed coordinates of body joint points and is compared with an included angle between edge vectors in the first feature plane set, and the action similarity of the learner is confirmed. The method has the advantages that the training and exercise effect of the learneris improved, and actions are safe enough without hidden danger of health; and the learner can obtain enough training experience from one action, so that the training effect of the learner is improved.

The invention relates to a method for preparation of a waterborne polyurethane impregnated superfine fiber synthetic leather base. The method includes the steps: coating waterborne polyurethane slurry on release paper, pasting a superfine fiber nonwoven fabric and carrying out infrared heating and hot-air drying; after cooling, carrying out impregnation to obtain the waterborne polyurethane impregnated superfine fiber synthetic leather base. Since only moisture volatilization exists in a production process, environment friendliness is realized; no harmful gas is generated in a production environment, and operators are protected from health hazards; due to the fact that waterborne materials in the waterborne polyurethane impregnated superfine fiber synthetic leather base have hydrophilic groups, excellent moisture permeability is achieved; after alkali deweighting and splitting, the waterborne polyurethane impregnated superfine fiber synthetic leather base is excellent in breathability. Compared with a traditional methylbenzene deweighting process, the alkali deweighting process in production of the waterborne polyurethane impregnated superfine fiber synthetic leather base has the advantage of high sustainability.

The invention relates to a method for determining the content of nitrogen in nitrate and / or nitrite of a water sample and a device thereof. According to the method, the water sample, deionized water and a buffer solution of which the pH value is 5.2-8.6 are mixed to prepare a mixed liquor, then the mixed liquor is heated at the temperature of 50-80 DEG C and then is irradiated under ultraviolet light, or the obtained mixed liquor is directly mixed with a sulfanilamide color-developing agent, and the content of the nitrogen in the nitrate and / or the nitrite of the water sample is detected by an ultraviolet and visible spectrophotometer. The device disclosed by the invention comprises a sample introduction device, a sampling ring, a multi-ported valve, a peristaltic pump, a heating module, an ultraviolet digestion module, a knitting reactor, a flow cell, the ultraviolet and visible spectrophotometer, a deionized water container, a buffer solution container, a color-developing agent container, a first three-way valve, a second three-way valve, a first back pressure regulator, a second back pressure regulator, a waste liquor groove and a computer. The method is nontoxic, and has no pollution on the environment; and the device is high in test sensitivity and good in accuracy.

The invention relates to a crank type rubbish bag chipper, and belongs to the technical field of the apparatus for splitting materials into pieces through a knife or other cutting methods or a ripping part, especially relates to a crank type rubbish bag chipper. The present invention provides a crank type rubbish bag chipper with functions of high automaticity, high efficiency, and no harm to thehealth of the rubbish treating staff. The crank style rubbish bag chipper comprises a bag breaking box. The structure characteristics of the bag breaking box are that: an upper end of the bag breaking box is provided with a rubbish bag inlet, a lower end of the bag breaking box is provided with a material outlet; slitters are arranged inside the bag breaking box, and are arranged on slitter inserting frames; the slitter inserting frames are connected with a power device.

The invention provides a method for preparing beta-silicon nitride whiskers. Based on the principle that aperture walls are utilized for supporting and aperture cavities provide growth spaces for whiskers, a porous ceramic block body composed of a mass of bird nest type microstructures is prepared through the method, wherein the bird nest type microstructure is constructed from a mass of beta-silicon nitride whiskers which are weakly combined together thus beta-silicon nitride whiskers can be obtained only by a grinding process. The method which can prepare a porous ceramic block body composed of a mass of bird nest type microstructures is a colloidal state foaming method. The silicon nitride whisker preparation method provided by the invention is a colloidal state foaming method which has the advantages of simple operation, high purity, high output, environmentally friendly characteristics, and no harm on human health.

The invention relates to a modified emulsified asphalt waterproof coating, and in particular relates to a low temperature resisting polymer modified emulsified asphalt waterproof coating which is waterproof, moisture-proof and corrosion-proof and is used in the fields of house roofs, undergrounds, indoors, roads and bridges and the like. The coating comprises the following ingredients in parts by weight: 20-40 parts of asphalt A, 1-10 parts of asphalt B, 10-30 parts of polymer emulsion, 0.5-3.0 parts of emulsifying agent, 20-40 parts of water, 10-30 parts of antifreeze agent, 0.1-0.6 part of drier and 0-1 part of thickening agent. The coating is large in film forming strength, high in extension, good in rebound resilience and good in low temperature performance; the formed film can be bent at the temperature of minus 40 DEG C repeatedly without crack and can be stored, transported and adopted for construction application in cold winter; and the coating is fast in film formation, short in drying time in winter construction and free from health damage on construction working personnel.

The invention relates to a water-based organic ceramic sprayed aluminum veneer and a manufacturing method thereof, and belongs to the technical field of curtain wall decorative boards. The water-based organic ceramic sprayed aluminum veneer comprises a passivation layer I, an aluminum baseplate, a passivation layer II, a bottom paint layer and a surface paint layer in sequence from top to bottom, wherein the bottom surface and the surface of the aluminum baseplate are conducted by passivation processing to obtain the passivation layer I and the passivation layer II respectively; the bottom paint layer is formed by spraying a water-based organic ceramic material for 15-20 <Mu>m on the passivation layer II; the surface paint layer is formed by spraying the water-based organic ceramic material for 20-30 Mum on the bottom paint layer. The sprayed aluminum veneer has the advantages that the aluminum veneer is controllable in range of glossiness, high in intensity and hardness, scratch resistant, acidproof, highly flame-retardant, and aging-resistant, provided with self-cleaning performance, and large in color choosing space.

The invention provides a transfer printing drawing device for drawing multicolor pattern, mainly including a computer and a control circuit, a multidirectional lever travel mechanism and a transfer printing head. The transfer printing head has a convenient detachable colour slurry box mechanism, the rotation of the transfer printing wheel on the colour slurry box mechanism is drived by the step motor or the servo motor, the transfer printing wheel of different width can transfer printing strokes of different width and replace different colours. The multicolour lever travel mechanism can travel on the flat working face. The transfer printing head is mounted on the multidirectional lever travel mechanism, which is controlled and mounted on the controlled computer on the drawing machine to complete the drawing by the manner of wireless network via main controlled computer. Comparing to the silk net printing technique, without plate making procedure and silk net, using the common textile fabric printing colour slurry with viscosity and the paint colour slurry as printing material, the colour can be prepared at will, the pattern with multicolour can be drawn on the cloth, road and so on material surface suitable for colouring.

The invention discloses a tool electrode high-speed rotation electromachining electric conduction device. The device comprises an air pump, a rubber tube, an upper end cover, a reducing valve, a revolution joint, a conducting solution, a fixed joint and an electric conduction screw. By the adoption of the device, the abrasion problem of an electric brush in a traditional electric conduction mode can be solved, and the advantages of being safe, green and free of pollution are achieved compared with a mercury electric conduction mode. Meanwhile, compared with a wireless electric conduction mode, the device is simple and easy to implement, the process difficulty and cost are low, and the practicability is good.

The invention discloses a mixture for improving the quality of rice noodles, a preparation method and an application thereof. Proportioning according to parts by weight, the mixture comprises a formula of the following raw materials: 1-10 parts of potato esterification crosslinked starch, 0.1-5 parts of soybean polysaccharide and 0.1-5 parts of other additives, wherein the potato esterification crosslinked starch, the soybean polysaccharide and other additives are all in an edible grade; other additives comprise one or more than one of carageenan, sodium alginate, single-glycerin ester, potatostarch and cassava starch. The preparation method comprises the following steps: weighing the potato esterification crosslinked starch, the soybean polysaccharide and other additives according to theformula of the raw materials, directly mixing the potato esterification crosslinked starch, the soybean polysaccharide and other additives evenly and preparing the mixture for improving the quality of the rice noodles. The rice noodles produced by adding the mixture have high transparence, are not easy to stick strips and have better toughness, and the rehydration performance, the mouth feel, thetoughness, the chawing strength, the soup turbidness, the strip breakage and the like of the rice noodles are all improved more obviously.

The invention discloses water-based environment-friendly rust removal and prevention film covering liquid and a production process thereof. The water-based low-VOC environment-friendly rust removal and prevention film covering liquid is prepared by adding coalescing agent, base material wetting agent, import antifoaming agent and other pollution-free auxiliaries with tannic acid as rust removal and prevention agent and vinyl multi-copolymerization emulsion as film forming material. Raw materials of the liquid are easy to obtain, rust removal labor is saved, anti-corrosion performance is high, and safety, environment protection and acid and alkali corrosion resistance are achieved.

The invention provides a biological insecticide containing methoprene as well as preparation and application methods thereof. The biological insecticide is prepared from the following components: 0.01-10% of methoprene, 0.01-5% of surfactant, 0.01-10% of light stabilizer and 75-99% of solvent. The biological insecticide has the advantages that: by adopting the mixed solvent and the surfactant at the same time, the effective ingredients can be uniformly dispersed in the solution, and the uniformity of the effective ingredients in the using process can be ensured; the light stabilizer is added, thus the attenuation rate of methoprene is obviously reduced, the storage life of the insecticide is prolonged, and the using effect of the insecticide is enhanced; and the biological insecticide has very obvious killing effects on mosquitoes and flies in water as well as beetles, flour moths and other lepidoptera, diptera, coleoptera, homoptera and other insects in grain and tobacco, and can be applied to prevention and control of mosquitoes and flies in tap water, storage of grain and tobacco as well as disinfection and insect disinfection of carpets and the like.

The invention provides a method for making soybean milk with a soybean milk machine and the soybean milk machine. The method includes sequentially performing soybean milk making and boiling. The boiling includes heating pulverized raw material, and performing ultrasonic defoaming on foams generated during heating. The defoaming treatment includes detecting foam volume and ultrasonically defoaming when abnormal foam volume is detected. The soybean milk machine includes a control module, a foam detection module and an ultrasonic defoaming device. The soybean milk machine allows the foam detection module to detect foams generated during soybean milk boiling and to transmit a signal when abnormal foam volume is detected to the control module, which sends an instruction to start the ultrasonic defoaming device for rapid defoaming through ultrasonic wave generated by the ultrasonic defoaming device. The method shortens soybean milk making time, has no foam in produced soybean milk, is convenient, rapid and safe, and has no danger to human health.

The invention discloses a manufacturing method for a mothproof writing brush. Pure natural plants are adopted, water boiled through camphorwood and camphorwood chips serve as a natural mothproofing agent to be used for conducting the mothproof treatment on the writing brush. In the whole treatment process, only a small amount of carrageen needs to be added to serve as a bonding agent, no chemical agent needs to be added, and insecticide and other harmful chemical substances are replaced to achieve insect prevention and mothproofing. A brush head can be placed for a long time, the mothproof effect is very good, and the manufacturing method is particularly suitable for storage of brush heads obtained after large-batch production. The problems existing in the industry all the time are solved. The cost is low, the mothproof effect is good, pollution will not be caused, or harm to the health of a user will not be caused. Brush bristles are not damaged, and the quality of the manufactured writing brush, especially Huzhou writing brushes is guaranteed; and during using, only the brush head needs to be scattered firstly, residual wood powder can automatically fall down, the writing effect cannot be affected, the ink absorbing amount is increased instead during ink dipping, and ink is more uniform during writing.

The invention provides a preparation method of a thalictrum plant extract. The preparation method comprises ultrasonic-assisted ethanol extraction of thalictrum plant(s). Preferably, the thalictrum plant(s) are / is radix thalictri simplicis and / or radix et rhizoma thalictri. The invention further provides the thalictrum plant extract obtained according to the preparation method, and application of the thalictrum plant extract in preparation of a medicine composition used for inhibiting citrus postharvest pathogen(s). The thalictrum plant extract has a strong inhibitory effect on the citrus postharvest pathogen(s), and no chemical residue exists after the thalictrum plant extract is used for fresh citrus preservation, so that the thalictrum plant extract is harmless to health of human bodies, free from environmental pollution, and low in drug resistance causing possibility.

The invention relates to a hydrophobic and oleophobic antibacterial wave-absorbing material. The hydrophobic and oleophobic antibacterial wave-absorbing material is prepared from, by mass, 87% to 93% of wave-absorbing material adhesive, 6% to 12% of wave absorbing material, 0.5% to 1% of antibacterial material and 0.5% to 1% of additive. The wave-absorbing material adhesive is a hydrophobic and oleophobic material. In the preparation process, all the components are mixed to be uniform. The hydrophobic and oleophobic antibacterial wave-absorbing material can be applied to kitchen electric products, and has the advantages of being easy to wash, free of potential health danger, good in temperature-resisting performance, simple in production process, good in antibacterial performance and wave-absorbing performance, saving time and materials and the like.

The invention relates to a method for preparing a plant extract for inhibiting orange post-harvest pathogenic bacteria, which comprises the following steps: drying the washed caulis impatientis at temperature of 45-50 DEG C, crushing and sieving the dried caulis impatientis with a 40-mesh sieve, and taking minus sieve powder for extraction; adding ethanol with the concentration of 70-95% based onfeed liquid volume ratio of 1:10 for carrying out ultrasonic circulated extraction at ultrasonic frequency of 30-40kHz at temperature of 45-55 DEG C for 3-5 hours; and carrying out reduced pressure concentration on the extract, and recovering a reagent so as to be prepared into a caulis impatientis stock solution with the content of 1g / mL. When in use, Tween 80 with the concentration of 0.01% is added to the stock solution of the extract to be diluted by 10 times. The orange fruits are soaked in the diluent for 1 minute, dried in the air, and packed into polyethylene film bags. The caulis impatientis extract has stronger inhibiting effect on the post-harvest pathogenic bacteria, belongs to a natural plant extract, and is used for retaining the freshness of the oranges without chemical residuals, health hazard to human bodies, and environmental contamination.

The invention provides infant toothpaste having an all-food-grade raw material formula. The infant toothpaste comprises the following components: a humectant, an adhesive, a stabilizer, abrasives, a sweetening agent, a nutrition enhancer, a flavouring agent, pigment, and the rest of water, wherein cellulose with the fibre length of 40-80 mu m and the granularity of 10-40 mu m is used as an abrasive, and the weight of cellulose is 15-72% of the total weight of the abrasives of the toothpaste. The toothpaste disclosed by the invention is good in teeth cleaning effect and lower in deciduous teeth abrasion; the toothpaste is particularly applied to cleaning infant deciduous teeth in low calcification extent, so that a delicate infant oral environment can be cared better; simultaneously, all selected components are edible components or food additives meeting national relevant safety and health standards; children are also safe even little toothpaste is remained and swallowed mistakenly, so that health potential accidents are avoided.

The invention provides a method for preparing self-toughening silicon nitride ceramics, and the method comprises the following steps that first a silicon nitride foam ceramic billet is prepared, then sintered to prepare a silicon nitride crystal whisker skeleton body, and finally a silicon nitride organic precursor is dipped, cracked and made into ceramics and the self-toughening silicon nitride ceramics is prepared. According to the method for preparing self-toughening silicon nitride ceramics, the silicon nitride ceramic foam body is obtained by directly foaming; then the silicon nitride ceramic foam body is sintered; a long column-shaped beta-silicon nitride crystal bar is fully grown through the special structure of a large number of pore spaces of the ceramic foam when in sintering; the grown long column-shaped beta-silicon nitride (Si3N4) crystal bar is nearly fully filled in each foam pore in the silicon nitride foam ceramic body; the average slenderness ratio of the beta-Si3N4 crystal bar is 20, and the maximum slenderness ratio can reach about 30; and the silicon nitride crystal whisker skeleton body which is obtained by sintering the silicon nitride foam ceramic billet is dipped and cracked to obtain the self-toughening silicon nitride ceramics, and the toughening effect is good.