37results about How to "Increase wear ratio" patented technology

Disclosed is a diamond grinding wheel with resin binder. High-thermal-conductivity rigid and crispy material which is phosphotungstic bronze alloy powder is used as filler for the grinding wheel. According to a formula of the grinding wheel, volume ratio of the phosphotungstic bronze alloy powder is 5%-25%, volume ratio of diamond is 5%-37.5%, volume ratio of resin binder is 10%-70%, volume ratio of chromic oxide is 0-15%, and volume ratio of zinc oxide is 0-15%. Without changing the prior art, the phosphotungstic bronze alloy powder is used as the filler for improving service performance of the diamond grinding wheel with resin binder. The diamond grinding wheel is fine in self-sharpening and high in sharpening degree, and abrasive ratio is increased greatly. Coarseness of the surface of a grinding piece is reduced, which corresponds with the trend that modern machining industry increasingly requires high precision.

The invention belongs to the field of preparation of composite materials, and in particular relates to a multi-principal alloy-diamond composite material and its preparation method and application. The raw materials of the composite material include 80-95vol.% binder phase powder and 5-20vol% diamond. The binder phase powder used is composed of Cu, Ni, Co, Cr in atomic ratio (20-40):(20-30):(20-30):(10-20). The preparation method is as follows: after fully mixing the bonding phase powder and the diamond powder, the spark plasma sintering process is used to sinter at 800-1000°C to obtain the product. The material has good interfacial bonding, diamond stability, and friction and wear properties. The multi-principal element alloy-diamond composite material designed and prepared by the present invention can be used to prepare grinding diamond-like tools such as diamond grinding discs and diamond grinding wheels.

The invention discloses a super-hard grinding tool of an inorganic and organic composite binder and a preparation method of the super-hard grinding tool. The super-hard grinding tool is characterized by being prepared by the following materials in percentage by volume: 10%-30% of super-hard grinding material, 30%-50% of thermosetting resin powder, 8%-12% of phosphate binder, 10%-29% of curing agent and 10%-29% of filler. The preparation method comprises the following steps of carrying out hot press molding after the composite binder and the grinding material are uniformly mixed, and then curing to obtain the super-hard grinding tool of the composite binder. Compared with a super-hard grinding tool of a resin binder, the super-hard grinding tool prepared by the preparation method has higher strength and higher heat resistance, and meanwhile, the super-hard grinding machine has good grinding performance.

The invention discloses a synthetic process of a compound superhard material. The synthetic process comprises the following steps: (1) putting an assembled hard alloy and a superhard material into a pyrophyllite body, putting the pyrophyllite body into a cubic press, pressurizing the pyrophyllite body to 8MPa-10MPa, and heating to 700-800 DEG C; and (2) further pressurizing the pyrophyllite body to 90MPa-100MPa, and heating to 1400-1700 DEG C. By virtue of the synthetic process, the dialysis of hard alloy elements in the compounding process of the superhard material can be reduced, the metal content in the superhard material can be reduced, the yield of the superhard material can be increased, the thermal stability of the superhard material can be improved, and the abrasive ratio can be increased.

The invention discloses a diamond saw blade and a preparation method thereof. The cutter head includes a first cutting area and a second cutting area; the first cutting area includes the following raw materials in parts by weight: 8-14 parts of polycrystalline diamond particles, iron powder 48-55 parts, copper powder 25-32 parts, zinc powder 4-6 parts, tin powder 2-3 parts, nickel powder 1.5-2.5 parts, cobalt powder 2-3 parts, manganese powder 1.5-2 parts, tungsten carbide and 2.5-5 parts of titanium carbide mixture powder, 0.4-0.7 part of lanthanum nickel five powder; the second cutting zone includes the following raw materials by weight: 10-16 parts of polycrystalline diamond and boron carbide mixture particles, 45-50 parts of iron powder, copper 27-33 parts of powder, 4-6 parts of zinc powder, 2-3 parts of tin powder, 1.5-2.5 parts of nickel powder, 2-3 parts of cobalt powder, 1.5-2 parts of manganese powder, 2.5-4 parts of titanium carbide powder, lanthanum 0.4 to 0.7 parts of nickel five powder. The diamond saw blade of the invention has excellent comprehensive performance.

A process for preparing an improved synthetic diamond sintered body includes such steps as screening, matching, and purification on diamond micro powder, deposition of a boron silicon oxide film, binder matching, ionizing plasma sintering, etc. The invention effectively reduces the requirement of high temperature and high pressure in the prior preparation technology, shortens the preparation time,improves the preparation efficiency of the synthetic diamond sintered body, reduces the preparation energy consumption, greatly improves the hardness and the wear ratio of the sintered product, and improves the quality of the product.

The invention discloses a diamond saw blade for dry-cutting of ceramic and a preparation method of the diamond saw blade. The diamond saw blade for dry-cutting of ceramic comprises a base body and a cutter bit; and the cutter bit comprises a first cutting zone, a second cutting zone and a third cutting zone. The diamond saw blade for dry-cutting of ceramic is divided into the first cutting zone, the second cutting zone and the third cutting zone, by selecting raw material compositions of the first cutting zone, the second cutting zone and the third cutting zone of the cutting bit carefully andoptimizing the contents of all raw materials, the diamond saw blade for dry-cutting of ceramic has good mechanical properties such as hardness and cutter bit abrasive ratio, during cutting, the cut surface of cut ceramic can be smoother, the cutting efficiency is high, edge breakage is not prone to occurring, and the diamond saw blade has broad application prospects.

The invention discloses a formula of an elastic grinding piece. The formula comprises a fine material layer and a thick material layer compounded up and down; the thick material layer comprises the raw materials of SG abrasives, high-temperature calcined corundum, white corundum, liquid phenolic resins, liquid butyronitrile rubber, powder-shaped phenolic resins, decolored and dewaxed lac powder, diamond powder, nanoscale gas-phase silicon dioxide, magnesium oxide powder, titanium white powder and phthalein green; and the fine layer material comprises the raw materials of corundum, white corundum, liquid phenolic resins, liquid butyronitrile rubber, powder-shaped phenolic resins, decolored and dewaxed lac powder, potassium fluoborate, nanoscale gas-phase silicon dioxide, magnesium oxide powder, titanium white powder and phthalein green. The prepared elastic grinding piece needs no flexible bending and softening, is excellent in polishing hand feel, breaks no edges, is high in durability, is excellent in flexibility, can reach the biggest bending angle of 52 degrees, is high in adaptability, can satisfy the demands on such precise machining as finish grinding and polishing in the bearing industry, and is high in surface precision of machined workpieces.

The invention belongs to the technical field of machining, and discloses a mining drill bit comprising a tool bit and a base body. The tool bit comprises, by weight, 100-120 parts of nickel powder, 85-90 parts of barium titanate powder, 70-75 parts of tungsten powder, 69-72 parts of silicon nitride powder, 65-68 parts of chromium carbide powder, 50-55 parts of alumina powder, 45-48 parts of chromium powder, 30-32 parts of copper powder, 25-28 parts of tungsten carbide powder, 20-22 parts of titanium carbide powder, 5-8 parts of water glass and 2-3 parts of silica gel. The invention further discloses a drill bit matrix. The drill bit has good bending strength, impact toughness and abrasive ratio.

The invention provides a polycrystalline diamond cubic boron nitride composite sheet, which includes a cemented carbide substrate, a polycrystalline diamond composite layer, a polycrystalline cubic boron nitride composite layer and a hard alloy protective layer arranged sequentially from bottom to top; The polycrystalline diamond composite layer is composed of diamond micropowder and nano metal bonding agent, and the polycrystalline cubic boron nitride composite layer is composed of cubic boron nitride micropowder and metal ceramic bonding agent. The present invention also provides a method for preparing the polycrystalline diamond cubic boron nitride composite sheet, using diamond micropowder and nano-metal binder to prepare diamond bond mixture; using cubic boron nitride micropowder and cermet bond to prepare cubic nitride Boron binder mixture; put the cemented carbide substrate into the tantalum cup, pour the diamond bond mixture and the cubic boron nitride binder mixture in turn; and put the cemented carbide protective layer, and then carry out high temperature after vacuum heat treatment High pressure sintering. The composite sheet has high impact toughness and strength.

The invention provides a method for machining an elliptic polycrystalline diamond for drilling. The machining method comprises the following steps of: adding a certain amount of boron into diamond powder, silicon and metallic nickel serving as basic raw materials and mixing; adding the mixture into a carbon synthetic mold; putting the synthetic mold into a vacuum furnace; heating the synthetic mold in vacuum; putting semi-finished products heated in the vacuum into a diamond hexahedron press for high temperature and high pressure synthesis; and releasing the pressure after the high temperature and high pressure synthesis to obtain a product of the invention, namely the elliptic polycrystalline diamond TSP for drilling. The polycrystalline diamond TSP prepared by the technical scheme has the advantages of higher thermal stability, higher anti-impact strength, higher abrasion resistance, capability of meeting the requirement of complicated bottom layer drilling, and over 85 percent of high product yield.

The preparation process of a polycrystalline diamond composite sheet with a mixed particle size provided by the present invention comprises the following steps: 1) preparation of a hard alloy part; 2) preparation of a composite transition layer; 3) selection of spherical micron diamond, which includes a particle size of The first diamond powder of ~7 microns, the second diamond powder of 15-19 microns, the third diamond powder of 25-27 microns and the fourth diamond powder of 35-39 microns, the first diamond powder , the second diamond micropowder, the third diamond micropowder and the fourth diamond micropowder are mixed and ball-milled with the bonding agent; dried under the protection of an inert gas and pressed into a polychip. The invention improves the proportion of the polycrystalline diamond, which greatly improves the abrasion ratio, impact toughness and Knoop microhardness of the polycrystalline diamond composite sheet with mixed particle size.

The invention belongs to the technical field of resin grinding wheels, and particularly relates to an elastic abrasive disc and a preparing method thereof. The elastic abrasive disc comprises, by weight, 25-35 parts of white corundum 80#, 20-40 parts of green silicon carbide 100#, 20-40 parts of ceramic corundum 100#, 20-25 parts of phenolic resin powder, 8-12 parts of phenolic resin liquid, 8-12 parts of potassium fluoroaluminate, 3-5 parts of modified nitrile rubber powder and 1-3 parts of iron oxide red. A toughening agent is added in the phenolic resin powder so that the elastic abrasive disc can have certain toughness, and a hardening curve for abrasive disc manufacturing is set more easily; the solid content of the phenolic resin liquid is high, and accordingly the abrasion resistance and cutting efficiency are improved; through adding of the modified nitrile rubber powder, the made elastic abrasive disc does not need to be bent or smoothened, the polishing and grinding feeling is good, durability is high, flexibility is good, and the requirements for machining of glass stone, hard alloys and the like can be met.

The invention discloses a method for plating boron carbide on a diamond surface. The method comprises the following steps: boriding on the diamond particle surface under the conditions that the vacuum degree is less than 100 Pascal, the temperature is preserved to 300 DEG C for 30 minutes and the temperature is preserved to 1200 DEG C for 3-12 hours, thereby plating a boron carbide film on the diamond surface. According to the diamond of which the surface is plated with the boron carbide film prepared by the invention, the binding force between a metal matrix and the diamond can be improved, the erosion resistance of the diamond to oxygen, iron, nickel and cobalt can be greatly improved, and the phenomena such as oxidation and graphitization of the diamond in the process of preparing a diamond-impregnated drill bit can be effectively avoided, so that the diamond inlaid into the metal matrix is complete in appearance, clear in edges and stable in performance. Therefore, the abrasive ratio of the manufactured appliances is greatly improved, and the service life is obviously prolonged.

The invention relates to a nanometal bonding agent. The bonding agent consists of the following raw materials in percentage by weight: 35-40% of TiN powder, 20-25% of TiC powder, 15-20% of Si3N4 powder, 15-20% of Co powder and 10-20% of Al powder. The invention also discloses a polycrystal CBN (cubic boron nitride) composite sheet made by using the nanometal bonding agent. The polycrystal CBN composite sheet comprises a CBN polycrystal layer and a hard alloy substrate, wherein the CBN polycrystal layer consists of the following raw materials in percentage by weight: 55-95% of CBN powder and 5-45% of nanometal bonding agent. In the polycrystal CBN composite sheet provided by the invention, by adopting the nanometal bonding agent in the formula of polycrystal layer, the technical bottleneck in high impact toughness and high bending strength of a PCBN composite sheet is broken, the impact resistance of a tool is enhanced, and the service life of the tool is prolonged.

The invention discloses a method for processing drilling hexagonal polycrystalline diamond. The processing method of the invention comprises the following steps of: adding a certain amount of boron into basic raw materials including diamond powder, silicon and metal nickel; blending the raw materials including the diamond powder, the silicon and the nickel with the boron and adding the mixed materials into a carbon synthesizing mold; putting the carbon synthesizing mold into a vacuum furnace for heating under vacuum; placing the semi-finished product after the vacuum heating into a diamond hexagonal heading press for high-temperature and high-pressure synthesizing; and relieving pressure after the high-temperature and high-pressure synthesizing to obtain the product of drilling hexagonal polycrystalline diamond TSP of the invention. The polycrystalline diamond TSP prepared by the technical scheme of the invention has relatively high thermal stability, relatively high impact resistanceand high wear resistance and can meet the requirements of complicated substrate drilling completely; and the qualification rate of the product is as high as over 88 percent.