227 results about "Ceramic knife" patented technology

This is a kind of Al2O3/ZrO2(Y2O3) nanometer compound ceramics knife material and its producing method. The material components include substance material and tenacity increasing phase. The substance material is Al2O3, and its grain granularity is 60 - 200 nm; according to volume percentage, its content is 65% - 90%, and the tenacity increasing phase ZrO2(Y2O3) nanometer powder containing 1.5% - 3.5% Y2O3 according to mol percentage; its grain granularity is 50 - 100 nm, and according to volume percentage, its content is 10% - 35%; its producing craft steps include producing substance material and nanometer powder of tenacity increasing phase by hydrochemistry method, produce grains, prepare material, ball mill to mix material, flan equal static pressure molding and sinter. The anti-bending strength of the prepared ceramics knife material ªÊ= 750 - 950 MPa, the fracture toughness KIC = 7.8 - 9.6 MPaíñm1/2, Weibull modulus m = 10 - 11.7, and durable intensity can get to 4 - 6 hours.

The invention discloses a ceramic cutting tool and the preparation method thereof special for a smashing line board or a circuit board, and belongs to the art of the smashing equipment. The ceramic cutting tool takes crystal whisker as the plasticizing material; tungsten carbide as the substrate material; titanium carbide as anti-friction agent; carbon as deoxidizing agent; and chromic compound, lanthanum oxide and cerium oxide as additive. The ingredients are evenly blended and directly molded by heat pressing. The raw material is not taken out until being fully mixed, and is then positioned into the sample heat pressing groove of a hot-press machine. The thermo-compression intensity of pressure is 10-40MPa, and the hot-press temperature ranges from 1,480 to 1,600DEG C. The flexible ceramic cutting tool of the invention is provided with good resilience, wearlessness, high rigidity and chemical stability. The technique of the cutting tool is quite simple and the production period is far shorter than the production period of the conventional preparation method that carries the compression molding of the evenly mixed raw materials first and then the sinter molding. The cutting tool material is fit for the cutting tool special for the making of a waste line board and the smashing equipment of the circuit board.

An electrically powered knife sharpener for ceramic (or other brittle, crystalline or amorphous media which could be used for blades) knives includes at least one pre-sharpening stage with a sharpening member(s) and includes a final stage with a sharpening member(s). There are one or more motor driven shafts on which the abrasive surfaced sharpening members, such as disks, are mounted. Guide structure is provided to guide the knife for aligning and positioning the knife facet precisely at a defined location on the abrasive surface of each rotating sharpening member. The pre-sharpening stage sharpening member(s) moves in a first direction. The final stage sharpening member(s) moves in a second direction which differs from the first direction.

The invention discloses a ceramic cutting tool cutting parameter optimization method on interrupted cutting conditions. The method comprises the steps that parameters of a ceramic cutting tool are determined; the initial state value and the critical state value of microscopic damage to the ceramic cutting tool are determined; parameters of workpiece materials are determined; geometrical shapes of the cutting tool and workpieces are set in finite element simulation software, and all the relevant parameters of cutting tool materials and the workpiece materials are imported; cutting parameter combinations adopted in the finite element simulation process are determined through an orthogonal experimental design method; the maximum damage equivalent stress value is calculated; the cutting parameter combination with the minimum value is selected. According to the ceramic cutting tool cutting parameter optimization method, the influences of the cutting tool microscopic damage state and external loads on invalidation of the cutting tool are considered, and meanwhile the orthogonal experimental design method is adopted, so that the optimization precision of the cutting parameter combinations is higher; the cutting parameter combinations are optimized, and the cutting parameter optimization cost is greatly reduced; the ceramic cutting tool cutting parameter optimization method can be widely applied to optimization of the cutting parameter combinations on the various interrupted cutting conditions, and the purpose of prolonging the service life of the cutting tool is achieved finally.

The invention aims to provide a high-performance ceramic knife which has high strength and high toughness and has high sharpness after putting the first edge on the knife as well as a method for preparing the ceramic knife. The high-performance ceramic knife comprises the following components in percentage by weight: 93-94 percent of mixture of ZrO2 and HfO2, 5-6 percent of Y2O3 and 0.2-1 percent of Al2O3. The method for preparing the ceramic knife comprises the following steps: (1) preparing a cutter blank; (2) sintering at the first stage; (3) sintering at the second stage; and (4) sintering and forming. According to the ceramic knife prepared by utilizing the method, the bending strength is improved from the original 900MPa to the 1100MPa, toughness is obviously improved, the initial sharpness of the ceramic knife is improved from the original 80mm to 95mm, and the durable sharpness is improved from 1100mm to 1500mm. The method can be applied to the field of manufacturing of ceramic knives.

The invention relates to an anisotropic graphene-toughened Al2O3 nano composite ceramic cutting tool material and a preparation method thereof. According to the ceramic cutting tool material, Al2O3 is used as the matrix, graphene nanosheets are used as a reinforcement phase, and MgO, Mo and Ni are used as sintering aids. The preparation method of the ceramic cutting tool material comprises the following steps: graphene dispersion, composite powder preparation, drying and screening, cold-pressed mold filling and hot-pressed sintering. In the graphene toughened Al2O3 nano composite ceramic material, the graphene has obvious graphene toughening effects, and has obvious orientation in the matrix. The mechanical properties of the ceramic cutting tool have obvious anisotropy in the directions which are perpendicular and parallel to the hot pressing direction.

The invention relates to a ceramic knife. By adopting advanced ceramic (zirconia) technology in domestic, the invention is to balance high hardness and abrasion resistance and characteristics of being easy to be broken and frangibility of ceramic materials to further improve sharpness and tool life of products and achieve Rockwell hardness of the ceramic materials up to HRC 80 degrees, which is much better than HRC 60 degrees of the present most excellent carbon steel and stainless knife. As the ceramic knife is made of novel and fine materials and the surface of the materials is similar to glass, the invention is uneasy to be polluted and is clean and sanitary, and can be cleaned quite conveniently.

The invention discloses a ceramic knife and a manufacturing method thereof. The ceramic knife comprises a plastic hilt, a ceramic blade and a metal piece, wherein, the ceramic blade is spliced in the plastic hilt through a connecting sheet; the metal piece is arranged in the outer position of the connecting sheet; a position equipped with the metal piece on a structure to be heated is heated through a thermatron when the ceramic knife is manufactured, molten plastic material is welded on the metal piece and the connecting sheet, and the ceramic knife is obtained after the molten plastic material is cooled down. The ceramic knife has a simple structure, the connection stability between the ceramic blade and the plastic hilt is easy to control, the finished product ratio is high, the manufacture effect can be controlled effectively, the manufacturing cost can be lowered greatly, the firm degree of formed structure is improved greatly by compared with the gluewater connection, the ceramic knife also has the advantage of compact and beautiful appearance, and the installing and fixing speed of the ceramic knife can be increased greatly; in addition, the metal piece in the ceramic knife can be detected through a metal detector when security inspection is carried out, so that safety accidents caused by the ceramic knife can be avoided.

The invention relates to a Si3N4/TiC/graphene composite ceramic cutter material with mechanical aeolotropy and a preparation method thereof. In the ceramic cutter material, silicon nitride serves as a matrix, TiC is a hard phase while graphene is a toughening phase, and MgO, Al2O3 and Y2O3 are adopted as composite sintering aids; and the ceramic cutter material is prepared by the processes of independent dispersion, composite dispersion, ball milling, drying and screening and hot-pressing sintering of the raw materials. According to the invention, in the prepared Si3N4/TiC/graphene composite ceramic cutter material, the graphene realizes an obvious toughening and reinforcing effect on the ceramic cutter material; and due to the oriental distribution of the graphene in the material, the mechanical properties of the Si3N4-based composite ceramic cutter material have aeolotropy. Moreover, by adding graphene, the friction coefficient of the composite ceramic cutter material is reduced, and the wear resistance is improved.

The invention discloses a processing method for an antibacterial ceramic knife. The processing method comprises the following steps that zirconium oxide powder with stable yttrium oxide, an antibacterial agent, a dispersing agent and deionized water are mixed and then prepared into slurry through ball milling, wherein the particle size of the zirconium oxide powder is 10-30 nm, and the particle size of the antibacterial agent is 10-50 nm; a binding agent is added into the slurry, the materials are stirred to be uniform, and granulating is performed to obtain zirconium oxide ceramic granulation powder; the zirconium oxide ceramic granulation powder is processed through preforming pressing and then processed through isostatic pressing treatment, and a green body is obtained; the green body is sintered to obtain a blank; the blank is polished, burnished and edged to obtain the antibacterial ceramic knife. According to the processing method for the antibacterial ceramic knife, the made ceramic knife is uniform in internal structure, higher in density and bending strength and better in tenacity, and the processed knife edge is sharp; in addition, due to the fact that the antibacterial agent is added, the antibacterial ceramic knife can have the better antibacterial property.

The invention belongs to the technical field of microwave sintering materials, and relates to an Al2O3-TiC-TiN micron composite ceramic cutter material and a microwave sintering method thereof. The Al2O3-TiC-TiN micron composite ceramic cutter material and the microwave sintering method thereof are characterized in that material dosing is conducted by the materials, by weight, 55%-75% of submicrons, 10%-15% of microns, 15%-20% of submicrons, 5%-10% of molybdenum powder and nickel powder, and the balance MgO and Y2O3; through protection of high-purity argon atmosphere, the microwave sintering process is conducted, and the Al2O3-TiC-TiN micron composite ceramic cutter material is successfully prepared. The Al2O3-TiC-TiN micron composite ceramic cutter material is high in compactness, high mechanical property is achieved, and the material is suitable for being using for manufacturing and processing cutters of materials difficult to process. The Al2O3-TiC-TiN micron composite ceramic cutter material prepared by the microwave sintering method is high in material performance, simple in process, saving in energy and time, low in cost, and prone to industrialization.

The invention discloses an Al2O3-Ti(C,N)-cBN ceramic tool material and a preparation method thereof, belonging to the technical field of materials. The ceramic tool material comprises main ingredients, auxiliary ingredients and additive ingredients, wherein the volume contents of Al2O3 and Ti(C,N) in the main ingredients are respectively 65-85% and 15-35%; the volume content of the auxiliary ingredients is 0.5-5% of that of the main ingredients; the content volume of the additive ingredients is 0.5-5% of that of the main ingredients. The preparation method comprises the following steps: (1) preparing main ingredients; (2) preparing auxiliary ingredients; (3) preparing additives; (4) ball-milling, mixing and drying the prepared main ingredients and a primary dispersing agent solution; (5) placing the main ingredients and the additives into a secondary dispersing agent solution, and performing ultrasonic dispersing treatment; and (6) ball-milling and mixing, then drying for at least 24h, then hot-pressing at the temperature of 1350-1450DEG C under the pressure of 30-45MPa. The ceramic material obtained by utilizing the method has high mechanical performance, can be used for processing intractable materials and the preparation cost is lower.

The invention relates to a ceramic knife and a preparation method thereof, and belongsto the technical field of new materials. The ceramic knife comprises the following materials by weight percentage: 50-70% of Al2O3, 15-40% of ZrO2, and 5-20% of a sintering aid. The sintering aid is one or two selected from MgO and TiO2, the ZrO2 is stabilized by Y2O3 or CeO2, and mass fraction of Y2O3 or CeO2 in ZrO2 is 2-4%. The preparation method of the ceramic knife comprises the following steps: weighing the raw materials according to the mass percentage and mixing; compacting the raw materials into a ceramic knife blank; placing the ceramic knife blank into a vacuum furnace for sintering and insulating by segment; and finally cooling with the furnace to obtain the ceramic knife. The ceramic knife provided by the invention has reasonable compatibility of materials and is prepared from a specific energy-saving and environment-friendly method with easy operations; and the ceramic knife has the advantages of light weight, high precision, high hardness, high bending strength, high fracture toughness, wear resistance and chemical corrosion resistance.

The invention relates to an antibacterial ceramic fruit paring knife and belongs to the technical field of production of functional ceramic knives. The antibacterial ceramic fruit paring knife comprises a ceramic knife body and a plastic handle. The antibacterial ceramic fruit paring knife is characterized in that a special ceramic with higher strength is adopted as the knife body, so that mechanical strength, thermal stability and dielectric strength of the ceramic knife are enhanced, corrosion caused by liquid and gas can be prevented, and the ceramic knife is durable; a negative ion layer is arranged on the outer surface of the ceramic knife body, an antibacterial effect can be achieved, and a common ceramic knife is upgraded into a functional high-grade kitchen utensil.

The invention belongs to the technical field of ceramics, and discloses high-thermal-conductivity and high-wear-resistance silicon nitride ceramic as well as a preparation method and application thereof. The preparation method of the silicon nitride ceramic comprises the following steps: adding diamond with a metal coating, Si3N4, a sintering aid MgO and Yb2O3 powder into ethanol and a Si3N4 ball-milling medium, carrying out ball-milling and mixing, and carrying out ball-milling and drying to obtain mixed powder; and heating the mixed powder to 1600-1700 DEG C under the axial pressure of 30-100 Mpa and under a protective atmosphere, conducting heat preservation, and carrying out spark plasma sintering. The silicon nitride ceramic provided by the invention has high thermal conductivity andwear resistance, good cutting performance and long cutting life, and can be applied to the field of ceramic cutters.

A device facilitating cake cutting comprises a disc. A center shaft is perpendicularly fixed to the center of the disc. The bottom end of the center shaft is fixedly provided with a blade. The side of the periphery of the disc is fixedly provided with four handles. The blade is in the shape like a Chinese character 'mi'. The center of the blade shaped like the Chinese character 'mi' is fixed to the bottom end of the center shaft. The four handles are evenly fixed to the circumference of the periphery of the disc, and the included angle formed between every two adjacent handles is 90 degrees. When the device is used, a user holds two handles with the left and right hands, the blade shaped like the Chinese character 'mi' is placed on a cake, the center shaft is aligned to the center of the cake, the user cuts the cake with the strength of the two hands, the cake can be cut into eight pieces at a time, the cut cake pieces are orderly and uniform, attractiveness is achieved, and unnecessary unhappiness caused by non-uniform distribution is avoided, so that the device is convenient to use and practical. The disc is made of transparency organic glass, the blade can be made of stainless steel materials or ceramic knife materials, the center shaft is made of stainless steel materials, and therefore the device is beautiful and safe.

The invention belongs to the field of microwave sintering material science and relates to an Al2O3/TiC composite ceramic knife material and microwave preparation method thereof. The microwave preparation method is characterized by including: determining content according to mass percent, wherein Al2O3 which is a matrix phase is 61.4-81.4%, TiC which is a reinforcement phase is 10-30%, Mo and Ni which are additives are 4-6%, MgO and Y2O3 are 1-1.5%, and Cr3C2 is 1-2.5%. The microwave preparation method includes: blending according to the above formula, utilizing a QM-3SP2 planetary ball mill for material mixing to prepare mixed powder, and pressing to form a biscuit; utilizing a microwave sintering temperature-holding device to successfully prepare the Al2O3/TiC composite ceramic knife material through high-purity argon protection and microwave sintering process. The composite material is high in compactness, and the microwave preparation method is suitable for manufacturing knives made of materials difficult to process and high in preparation efficiency. The material prepared by the method is good in performance and low in energy source consumption.

The invention discloses a wear-resistant carbide-based metal ceramic knife and a manufacturing method thereof. The wear-resistant carbide-based metal ceramic knife is manufactured by, by weight, 40-50 parts of titanium carbide, 45-60 parts of silicon carbide, 20-30 parts of copper powder, 3-11 parts of asbestos powder, 3-6 parts of maldonite powder, 1-5 parts of diaspore powder, 3-8 parts of graphene, 3-6 parts of potassium oxide, 10-15 parts of glass fiber and 11-15 parts of paraffin. Compared with conventional metal ceramic knives, the wear-resistant carbide-based metal ceramic knife manufactured by the method has higher wear resistance and heat resistance and excellent cutting performance; through optimization of components and content, compactness and bending resistance of metal ceramic tissue are improved remarkably, and the wear-resistant carbide-based metal ceramic knife can be widely used for high-speed cutting of low-medium-carbon steel and low-alloy steel.

The invention provides a SiC whisker synergistic silicon nitride particle toughened alumina-based ceramic cutter material and a preparation process thereof. The preparation method comprises the following steps: preparing SiC whiskers and a sintering aid into slurry, uniformly mixing the slurry with Al2O3 and Si3N4, drying to obtain composite ceramic powder, pre-pressing the composite ceramic powder into a green body, and carrying out vacuum hot-pressing sintering on the green body to obtain the alumina-based ceramic cutter material, wherein the heating process of the vacuum hot pressing sintering comprises the following steps: heating to 190-210 DEG C at a first heating rate, keeping the temperature, heating to 1350-1450 DEG C at a second heating rate, keeping the temperature, heating to 1500-1650 DEG C at a third heating rate, and keeping the temperature; in the heating process of vacuum hot-pressing sintering, the green body is firstly kept pre-pressed, when the temperature rises to1050-1150 DEG C, the pressure of the green body is started to be increased and kept, and when the temperature continues to rise from 1350-1450 DEG C, the pressure of the green body continues to be increased until the temperature rising is ended, and the pressure is kept.

A process for machining a pull ring mold mainly relies on working procedure selection and arrangement, selection of a cutting tool, control over machining allowances, the rotating speed of a spindle and the feeding speed, and detection steps performed between key steps. The process includes the steps that a, vacuum heat treatment is conducted on mold steel, so that the hardness of the steel reaches HRC 58-60; b, the machining allowance of 0.3 mm is reserved, a blank is machined into an outer square shape through an accurate grinding angle rule, and the machining precision reaches the range within 0.01 mm; c, a part machined in the previous step is used as a positioning datum plane, semi-finish machining forming of an inner outline is conducted, a ball cutter is adopted, the machining allowance of 0.5 mm is reserved, and the rotating speed of a machine is controlled to range from 20000 r/min to 21000 r/min; d, vacuum heat treatment is conducted, so that the hardness of a workpiece reaches HRC 58-60; e, an outer square outline is machined through a hexahedral angle rule, the allowance of 0.02 mm is reserved, it is guaranteed that the requirements for the parallelism and perpendicularity of the part are both in the range within 0.005 mm, and the perpendicularity of the upper surface and the side surface is smaller than 0.003 mm; f, a numerically-controlled machine tool is adopted for clamping, the superhard ceramic cutting tool is selected, the rotating speed of the machine is 25000 r/min, the feeding speed is 1200 mm/min, and the tool is moved according to a procedure; and g, precise forming grinding is conducted on the shape until the shape is within the dimensional tolerance.