163results about How to "Sintered dense" patented technology

The invention discloses a crystalline silicon solar cell front silver paste and a preparation method thereof. The front silver paste comprises the following components in percentage by weight: 85-90%of silver powder, 5-10% of an organic carrier, 5-10% of an organic carrier, 1.5-5% of composite glass powder, and 0.05-1% of a silver paste additive. The silver powder in different particle size distribution is cooperatively used, the slurry is good in ink permeability, and the silver powder particles in the grid line are more uniformly and tightly filled, so that the sintering density of the gridline is facilitated, the resistance of the grid lines is reduced, and the photoelectric conversion efficiency is improved. The preparation process of the glass powder is simple, the control is facilitated; the glass powder with different components is compounded and used, so that a series of particles are uniform, the softening temperature is low, and the composite glass powder has good wettability to the silver powder and the silicon substrate, a front silver paste prepared from the composite glass powder is sintered on the front surface of the cell, the silver electrode and the silicon havegood ohmic contact and welding performance, and the adhesion strength of the electrode is high.

The invention provides an aluminum nitride aluminum-coated base plate and a preparation method thereof. The base plate comprises an aluminum nitride ceramic substrate and an aluminum layer positioned on at least one surface of the aluminum nitride ceramic substrate, wherein an oxide modification layer and an aluminum-silicon alloy soldering terminal layer are sequentially arranged between the aluminum nitride ceramic substrate and the aluminum layer, and the modification layer contains Cu2O and also contains at least one group of the following two groups of compounds: (1) CuAlO2, CuAl2O4 and Al2O3; and (2) CuSiO2 and SiO2. The aluminum nitride aluminum-coated base plate provided by the invention has good binding force and strong heat shock resistance.

The invention relates to a preparation method of metal material or metal composite material, and in particular to a method for preparing metal material or metal composite material by adding phenolic resin powder. The preparation method comprises two sets of schemes; the first scheme comprises the following steps of uniformly mixing raw materials, and pressing and sintering to obtain the metal material, wherein the raw materials comprise metal powder and phenolic resin powder; and the second scheme comprises the following steps of ball milling reinforcing bodies and matrix metal A to obtain metal powder with the reinforcing bodies embedded in the surface and the interior, carrying out ultrasonic treatment, low-temperature heating and chilling on the metal powder embedded with the reinforcing bodies to remove reinforcing particles on the surface of the metal powder to obtain a standby material, mixing the standby material with the phenolic resin powder for pressing and sintering, or mixing the standby material with the phenolic resin powder and granular phase B for pressing and sintering to obtain carbon / metal composite material. The method has the advantages that the preparation process is simple, obtained products are excellent in performance, and the method is convenient for large-scale application.

The invention discloses a preparation method of Al<4>SiC<4> and Al composite reinforced silicon carbide honeycomb ceramic. The preparation method comprises the following steps: taking silicon carbidepowder A, silicon carbide powder B, Al<4>SiC<4> and Al powder as main materials, adding a metal oxide accounting for 5-15 wt% of the main materials as a sintering aid, on the basis of the mass of themain material, dissolving 7.5wt% of cellulose, 3-5 wt% of a surfactant, 1.5-3.5 wt% of vegetable oil and 1-4 wt% of glycerol in equal mass of water to obtain a binding agent, mixing the main materials, the sintering aid and the binding agent uniformly, so as to obtain a mixture; pouring the mixture into a vacuum extruder for forming, performing drying, so as to obtain a honeycomb ceramic green body; heating the honeycomb ceramic green body to 2000-2200 DEG C under an argon atmosphere condition, preserving heat for 1-3 hours; and performing natural cooling, so as to obtain the Al<4>SiC<4> and Al composite reinforced silicon carbide honeycomb ceramic. According to the Al<4>SiC<4> and Al composite reinforced silicon carbide honeycomb ceramic prepared by the method, raw material utilization rate is high, the production efficiency is high, the structure of the product is wall-flow type, the purification capacity on the waste gas is improved, the microstructure is good, the micropore distribution is uniform, and the mechanical strength is high.

The invention discloses a preparing method for zirconium boride dispersion strengthening tungsten powder, and relates to metal tungsten powder preparing. In the preparing method, deionized water, ammonium metatungstate and nano zirconium boride particles are prepared into a solution according to the needed proportion, after being subjected to uniform stirring and ultrasonic scattering, the solution is injected into liquid nitrogen, a frozen precursor is obtained, the frozen and dried precursor is roasted in the argon atmosphere with the temperature ranging from 400 DEG C to 600 DEG C, reduction of (500 DEG C-650 DEG C)*2h+ (700 DEG C-900 DEG C)*1 h is conducted in the hydrogen atmosphere, the temperature rise rate is (2-10) DEG C / min, the hydrogen flow is (0.1-1.0) L / min, and the dispersion strengthening tungsten powder is obtained. A tungsten base body obtained through the tungsten powder is sintered, particles are evenly dispersed in the interiors of crystal grains and grain boundaries, the size of the particles is the nano level, an obtained block is subjected to the mechanical test, and it is proved that the mechanical performance of the block is obviously improved. The dispersion strengthening tungsten prepared through the method has very high grain-boundary strength; and meanwhile, compared with traditional metal carbide and rare earth oxide dispersion particles, zirconium boride dispersion strengthening can reach a higher strengthening and toughening effect under the smaller adding amount.

The invention relates to a sintering method of electrolytes for a solid oxide fuel cell, and belongs to the field of solid oxide fuel cells. The method comprises the steps as follows: a binder is added to solid oxide electrolyte powder which is pressed into a block; different electric fields are applied to different electrolytes; the field intensity can be adjusted from 30Vcm<-1> to 200Vcm<-1>; meanwhile, the electrolytes are heated in a furnace; the current is instantly increased when the electrolytes are heated to 500-1250 DEG C; the current is limited; and constant-current heat-insulated sintering is carried out, so that the electrolytes are densely sintered. Compared with a conventional electrolyte sintering method, the sintering method provided by the invention has the advantages that the sintering method is low in furnace temperature requirements and high in sintering rate; electrolyte ceramic which is difficult to sinter can be densified; a sintering aid does not need to be added; and a device is simple and convenient.

The invention discloses a preparation method for silicon-dioxide-coated copper electronic paste used for an LTCC substrate. Copper powder is preprocessed by diluted hydrochloric acid firstly; then TEOS is pre-hydrolyzed; the surface of the copper powder is coated with silicon dioxide by adopting a sol-gel method; an organic carrier is prepared additionally; finally, the silicon-dioxide-coated copper powder and the organic carrier are mixed, and are screen printed on the LTCC substrate; and then the mixture is sintered under a nitrogen atmosphere at a temperature of 850-910 DEG C to obtain the silicon-dioxide-coated copper electronic paste / LTCC composite substrate. The copper / LTCC composite substrate prepared by the invention is relatively high in density, excellent in conductivity and low in sheet resistance; uniform diffusion of the silicon dioxide binder in the paste is realized; and in addition, the preparation method is simple in process, capable of lowering the cost, non-toxic and environment-friendly.

The invention discloses a zirconia ceramic piece. The zirconia ceramic piece is prepared by employing zirconia as a main raw material and through a ceramic production technological process. Correspondingly, the invention also discloses a preparation method of the zirconia ceramic piece. The preparation method includes the steps: carrying out dry pressing molding and isostatic pressing molding of the main raw material for preparing the zirconia ceramic piece to obtain a piece green body; carrying out high-temperature sintering of the molded green body in an electric furnace with the high-temperature sintering temperature of 1400-1600 DEG C; processing the sintered green body with a piece pattern by an ultrasonic technology; painting a ceramic glaze on the pattern on the surface of the green body; carrying out glaze firing of the glazed green body; and grinding flatly and polishing the glaze-fired green body to obtain the zirconia ceramic piece product. By adopting the preparation method, the zirconia ceramic piece is glittering, translucent, bright, high-grade and elegant, has high degree of finish, jade texture, compact structure, high strength and high hardness, and creates a new piece species.

The invention relates to a microwave dielectric ceramic by low-temperature co-fired ceramics and a preparation method thereof. The microwave dielectric ceramic consists of ywt% of [(1-x)Ba5Nb4O15-xBaWO4] ceramic material and zwt% of BaO-B2O3-SiO2 glass material, wherein the ranges of x, y and z are as follows: x is more than or equal to 0.3 and less than or equal to 0.85, z is more than or equal to 1% and less than or equal to 15%, and the sum of y and z is 100%. The zwt% BaO-B2O3-SiO2 glass material is prepared from the components in percentage by weight: 5-35wt% of BaO, 10-40wt% of B2O3 and 5-25wt% of SiO2, and is obtained by mixing powder of all the components and melting at the temperature of 1000-1300 DEG C. The [(1-x)Ba5Nb4O15-xBaWO4] ceramic material with the percent of ywt% and BaO-B2O3-SiO2 glass material with the percent of zwt% are mixed and then sintered. The material is sintered at a low temperature of 880-900 DEG C for 0.5-4 hours, has the range of dielectric constant of 11.5-30.4, and is applicable to the range from a medium dielectric constant to a low dielectric constant. The microwave dielectric ceramic has the excellent characteristics of low dielectric loss, high quality factor, low temperature frequency coefficient and low capacitance coefficient and the like, and can be co-fired with a noble metal electrode (silver) in the atmospheric environment.

The invention discloses a method for preparing lithium iron phosphate having high tap density. The method for preparing lithium iron phosphate having high tap density is characterized in that on the basis of existing solid phase method preparation of lithium iron phosphate, a carbon source is reduced or not added at a precursor mixing phase so that the failure in sintering densification of lithium iron phosphate grains caused by coated carbon is avoided; at a high temperature area of a sintering phase, a front phase attaches importance to nitrogen atmosphere or weak reducing atmosphere protection, the coated carbon is deposited in a CVD method at a later phase, and accordingly lithium iron phosphate having high tap density is obtained. According to the method, sintering densification is performed first and then uniform carbon deposition is performed, and accordingly high-performance lithium iron phosphate having high tap density and uniformly coated with carbon is obtained. The method is improved based on existing industrialization and is easy to achieve.

The invention relates to the technical field of researches and developments of refractory materials, and discloses a refractory material with high strength and mechanical property. A large number of non-clay silicate components in iron pyrite are used; zirconium oxide and silicon dioxide are used as skeleton structures and raw materials; aluminum oxide, ferric oxide and the like are used as combustion aids; a multiphase material is sintered to be compact by using a toughening mechanism of a rare earth element to a zirconium oxide material through a liquid phase sintering mechanism of the rareearth element under a reducing atmosphere, so that the mechanical property of the refractory material is improved; furthermore, an optimal raw material proportion, an optimal granularity and an optimal sintering temperature are researched to improve the compaction degree and the physical property of the material, so that the refractory material with high strength and mechanical property is prepared; furthermore, the recycling and utilization rate is high.