4results about How to "Dense tissue structure" patented technology

The application relates to the field of advanced structural ceramics, and particularly discloses a gel injection molding method for preparing high-performance silicon nitride ceramics and a preparation method thereof. Raw materials include beta-SiN submicron powder 75 parts, YO submicron powder 8 parts, TiC submicron powder 5 parts, AlO superfine powder 5 parts, ZrO submicron powder 2 parts and wollastonite 5 parts in terms of mass ratio, a complex whisker regulator and an entry liquid are used, and ceramics are prepared through gel injection molding, dehydration, degreasing and gas pressure sintering. The grain morphology and interface combination are optimized through the whisker regulator, the slurry dispersion and the green body uniformity are improved through the entry liquid, and the product has a density greater than or equal to 99%, a Vickers hardness greater than or equal to 1700HV and a bending strength greater than or equal to 930MPa through 1700-1850 DEG C. gas pressure sintering, and the product has high density, high hardness, high toughness, wear resistance, corrosion resistance and long service life.

The present application relates to a kind of high-temperature impact wear strengthening layer and its preparation method and application, belong to laser processing material technical field.High-temperature impact wear strengthening layer is prepared using high carbide content alloy powder, the high carbide content alloy powder is in mass percentage, chemical composition is as follows:Al:2.7%~3.0%, C:5.8%~6.3%, Cr:63.5%~64.5%, B:0.02%~0.04%, O≤200ppm, N≤50ppm, H≤5ppm, the balance is Ni.The strengthening layer of the present application, high hardness, high-temperature impact wear resistance is good, can satisfy the demand of the surface performance of heavy-duty diesel engine key component.

A method for preparing a binary formula for Dai pottery clay and its application is disclosed. The method involves taking Dai pottery clay from the Honghe River basin, five-colored clay from Honghe County, and charcoal powder. The Dai pottery clay and five-colored clay are sun-dried and weathered for at least three months. The Dai pottery clay from the Honghe River basin has a SiO2 content of not less than 50%, an Al2O3 content of not less than 15%, an Fe2O3 content of not less than 10%, and a loss on ignition of less than 10%. The five-colored clay from Honghe County has a SiO2 content of 72-82%, an Al2O3 content of 9-12%, and an Fe2O3 content of 3-5%. The method involves soaking the Dai pottery clay and five-colored clay in water until fully saturated, then ball-milling them. The slurry is sieved, and then charcoal powder is added. After stirring evenly, the clay is pressed to drain water and then kneaded to remove air. This invention can improve the throwing and molding performance of Dai pottery clay, increase the sintering temperature and the density and strength of its structure, and reduce the burn-off rate.

The invention discloses an Al2O3-NiAl double-layer coating and a preparation method thereof, and belongs to the technical field of metal material plating. In order to solve the problem that in the prior art, the service performance of the aluminum alloy surface is limited, the Al2O3-NiAl double-layer coating on the aluminum alloy surface and the preparation method are provided, the Al2O3-NiAl double-layer coating is formed by spraying a NiAl coating on an aluminum alloy matrix, the NiAl coating is obtained by mixing nickel powder and aluminum powder and then conducting spraying reaction, and the coating containing NiAl and Ni3Al compounds is obtained. And then the NiAl coating is subjected to oxidation treatment, so that a compact Al2O3 ceramic layer is formed on the surface. The Al2O3-NiAl double-layer coating is of a compact structure, corrosion medium permeation and crack propagation can be effectively hindered, and good corrosion resistance and wear resistance are shown.