46results about How to "Anti-oxidation temperature is high" patented technology

The invention relates to a tungsten-cemented aluminium carbide sintered body, and the expression is(W1-xAlx)C-Co, in which x=0.1-0.86, which is alloy block-shaped material with good crystalline shape and fine texture. Proved by X-ray powder diffraction analysis and scanning electron microscope analysis, the tungsten-cemented aluminium carbide sintered body is of stable structure, improved crystallinity and higher degree of compactness. The tungsten-cemented aluminium carbide sintered body of this invention not only has glass hard and high-wearing feature of tungsten carbide, but also has lightweight, oxidation resistance and fine ductility of aluminium, which makes the alloy have high hardness, high bending strength and lower density and develop into new carbide alloy with high hardness, high strength, good workability and high oxidation-resistance temperature. The said material is hoped to be used in mechanical tool, glass-cutting, bolt die, broaching die, bowl, well drill, mine drill, cutting drill and electrical contact material.

The invention relates to a method for preparing a Y2Si2O7 whisker-toughened mullite composite coating. The method comprises the following steps: preparing a SiC porous internal coating on the matrix surface of a C / C composite material through an embedding method, preparing Y2Si2O7 whiskers, and then performing surface modification to the Y2Si2O7 whiskers with a composite surface active agent to obtain a mixed liquor; and performing ultrasonic electrophoretic selective assembly deposition to the C / C composite material prepared with the SiC porous internal coating and the mixed liquor to obtain a Y2Si2O7 whisker pinning layer, and finally preparing the Y2Si2O7 whisker-toughened mullite composite coating through a hydrothermal electrophoretic deposition method. Compared with other coatings, the prepared Y2Si2O7 whisker-toughened mullite composite coating can effectively increase the oxidation-resistance temperature, can realize the anti-oxidation protection of 400 hours for the C / C composite material under the condition of dynamic brush of high temperature (1700 DEG C) gas, and the oxidation loss rate is lower than 0.77 percent.

The invention discloses a preparation method of an Y4Si3O12 whisker toughened mullite composite coating. The preparation method comprises the following steps of: preparing a SiC porous internal coating on the surface of a C / C composite material substrate by using an embedding method; preparing Y4Si3O12 whisker and performing surface modification on the Y4Si3O12 whisker by using composite surfactant to obtain mixed solution; performing ultrasonic electrophoresis selective assembly and deposition by using the C / C composite material prepared with the SiC porous internal coating on the surface and the mixed solution to obtain a Y4Si3O12 whisker pinning layer; and finally preparing the Y4Si3O12 whisker toughened mullite composite coating by using a hydrothermal electrophoretic deposition method. Compared with other coatings, the Y4Si3O12 whisker toughened mullite composite coating has the advantages that the anti-oxidation temperature can be effectively improved, anti-oxidation protection of 450 hours for the C / C composite material can be achieved under the high-temperature gas dynamic erosion condition of 1,500 DEG C, and the oxidation weight loss ratio is less than 0.62 percent.

The invention provides a C / C composite and a preparation method of a surface oxidation resistant composite coating of the C / C composite. The preparation method of the surface oxidation resistant composite coating of the C / C composite comprises the following steps: horizontally laying inner layer oxidation resistant powder on the surface of the C / C composite, and then horizontally laying outer layer oxidation resistant powder to obtain green bodies; placing green bodies into a discharge-produced plasma sintering furnace for sintering for 30 s-1 min at the temperature of 1200-1400 DEG C under an oxygen-free environment, tapping off to obtain the products, wherein the inner layer oxidation resistant powder mainly comprises the following components in parts by weight: 60-70 parts of elementary substance Si and 20-30 parts of elementary substance C; the outer layer oxidation resistant powder is mainly SiC powder. According to the C / C composite and the preparation method of the surface oxidation resistant composite coating of the C / C composite, provided by the invention, the preparation steps of the outer layer coating and the inner layer coating is not required to be carried out separately, the preparation temperature is low, the preparation time is short, the prepared oxidation coating is uniform, compact, well combined with the matrix and high in oxidation resistance temperature.

The invention belongs to the technical field of powder metallurgy, and relates to a low-cobalt hard alloy resistant to high temperature, abrasion and corrosion and a preparation method thereof. The low-cobalt hard alloy resistant to high temperature, abrasion and corrosion comprises the following ingredients in parts by mass: 0.1-1.0 part of Co, 0.4-0.6 part of Cr3C2, 6.0-8.0 parts of TaC, 0.6-1.0 part of NbC, 2.0-4.0 parts of TiC and 75-90 parts of WC. The low-cobalt hard alloy provided by the invention is relatively small in WC grain size and is uniform in distribution, and has an average grain size being 0.30-0.35 [mu]m; meanwhile, the low-cobalt alloy has hardness of HRA94.6-96.5, bending strength of 2300-2700N / mm<2>, has good high temperature resistance, good abrasion resistance and good corrosion resistance, can effectively prolong the service life of a tool, and can improve cutting efficiency of the tool.

The invention discloses a doped high-infrared reflection rare-earth sesquisulfide gamma-Ce2S3 coated mica pearlescent pigment and a preparation method thereof. The preparation method comprises the following steps: preparing a mixed oxide coated mica pearlescent pigment with soft pearly luster by a sol-gel process; uniformly mixing the mixed oxide / mica pearlescent pigment with appropriate additive; and performing high-temperature sulfurizing reduction to obtain a doped rare-earth sesquisulfide Ce(2-x)MxS3 (M=Y<3+> or Nd<3+>) coated mica pearlescent pigment. The hue and tinting strength of the doped rare-earth sulfide pearlescent pigment prepared by the method change along with the type, dosage and coating rate of the doping metal M. Moreover, the sintering degree of the composite pigment is low, and the properties such as brightness and oxidation resistance of the product are remarkably improved over pure rare-earth sulfide pigment; and meanwhile, the synthesized Ce(2-x)MxS3 (M=Y<3+> or Nd<3+>) coated mica pearlescent pigment has a high ultraviolet absorption property in an ultraviolet region and a high infrared reflection property in a near infrared region and has broad application prospects in the field of anti-ultraviolet and solar heat-reflection thermal insulation coatings.

The invention discloses a heat-resistant and wear-resistant composite board and a preparation method thereof, and specifically relates to the technical field of composite boards, including: a substrate, a wear-resistant alloy board, a heat-resistant glue layer and a wear-resistant coating powder. In the present invention, the heat resistance of the heat-resistant and wear-resistant composite board can be effectively improved, so that the internal heat distribution of the composite board is more uniform, the internal damage of the composite board is reduced, the service life is prolonged, and the wear resistance of the composite board is improved at the same time; modified nano tin oxide Antimony and modified nano-boron nitride can improve the heat resistance of the heat-resistant adhesive layer; modified silicon carbide whiskers and modified nano-titanium diboride can enhance the heat resistance and wear resistance of the wear-resistant coating, thereby improving the composite The heat-resistant and wear-resistant performance of the board, the connection between the substrate and the wear-resistant alloy plate is realized by two methods of glue connection and brazing, which can effectively strengthen the stability of the connection of the composite board, and the multi-layer circular distribution avoids direct transfer of local heat to the substrate , more evenly heated.

The invention provides a wolframium (W) doped diamond-like coating and a preparation method thereof. The coating comprises a Cr bottom layer, a CrC transition layer and a W doped diamond-like layer, wherein the Cr bottom layer is deposited on the surface of a substrate, the CrC transition layer is prepared on the Cr bottom layer, and the W doped diamond-like layer is prepared on the CrC transition layer. The preparation method comprises the following steps: firstly carrying out plasma cleaning on the substrate, opening a column electric arc Cr target to prepare the Cr bottom layer on the surface of the substrate, opening a plane magnetron sputtering C target to prepare the CrC transition layer on the Cr bottom layer, and finally closing the column electric arc Cr target and opening a plane magnetron sputtering W target to prepare the W doped diamond-like layer on the CrC transition layer. According to the preparation method provided by the invention, the electric arc and magnetron sputtering composite coating technology is adopted, so that the prepared coating is smooth and compact in surface, high in hardness, high in film bonding strength, low in friction coefficient and good in oxidization resistance and chemical stability, and can meet relatively high requirements for oxidization resistance, wear resistance and antifriction performance, therefore the coating has wide application prospects.