Unlock instant, AI-driven research and patent intelligence for your innovation.

High-hardness silicon nitride ceramic and preparing method thereof

A technology of boron nitride and high hardness, which is applied in the field of ceramic production, can solve the problems of affecting the mechanical properties of reaction sintered boron nitride, reducing the strength of products, increasing the brittleness of products, etc., so as to improve uniformity and compactness, improve fracture toughness, Improves strength and density

Inactive Publication Date: 2015-12-23
徐明
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the density of boron nitride is high, and the product is heavy. Because the high free silicon content in the product will increase the brittleness of the product, reduce the strength of the product, and seriously affect the mechanical properties of reaction sintered boron nitride, it has been subject to certain restrictions in use. limit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A high-hardness boron nitride ceramics, made of the following raw materials in parts by weight: boron nitride 100, aluminum oxide 3, kaolin powder 4.5, zirconia powder 1.2, calcium oxide powder 2.8, titanium dioxide powder 4.4, carbon black powder 2.5, Antimony trioxide powder 2.9, carbon fiber 2.1, surfactant 0.15, polyethylene 1.7, absolute ethanol 26, glycerin 4.6, deionized water 68.

[0024] Wherein, the length of the carbon fiber is 4mm, and the surfactant is glyceryl monostearate and sodium lauryl sulfonate.

[0025] The method for preparing above-mentioned high-hardness boron nitride ceramics comprises the following specific steps:

[0026] (1) Mix boron nitride, alumina, kaolin powder, zirconia powder, carbon black powder, calcium oxide powder, titanium dioxide powder, antimony trioxide powder, and deionized water into a grinding ball equipped with high-purity alumina Mill in a ball mill tank for 90 minutes, then add polyethylene, absolute ethanol and glycerin...

Embodiment 2

[0032] A high-hardness boron nitride ceramic, made of the following raw materials in parts by weight: boron nitride 115, aluminum oxide 6, kaolin powder 7, zirconia powder 2, calcium oxide powder 4, titanium dioxide powder 6, carbon black powder 2, Antimony trioxide powder 3.5, carbon fiber 3, surfactant 0.3, polyethylene 3, ethanol 30, glycerin 5, deionized water 75.

[0033] Wherein, the length of the carbon fiber is 8 mm, and the surfactant is glyceryl monostearate, polysorbate, sorbitan fatty acid, sodium dioctyl succinate sulfonate, sodium lauryl sulfonate.

[0034] The method for preparing above-mentioned high-hardness boron nitride ceramics comprises the following specific steps:

[0035] (1) Mix boron nitride, alumina, kaolin powder, zirconia powder, calcium oxide powder, titanium dioxide powder, carbon black powder, antimony trioxide powder, and deionized water into a grinding ball equipped with high-purity alumina Mill in a ball mill tank for 60 minutes, then add po...

Embodiment 3

[0041] A high-hardness boron nitride ceramic, made of the following raw materials in parts by weight: boron nitride 85, aluminum oxide 1, kaolin powder 2, zirconia powder 0.6, calcium oxide powder 1.5, titanium dioxide powder 2, carbon black powder 3, Antimony trioxide powder 1.5, carbon fiber 0.6, surfactant 0.05, polyethylene 0.5, absolute ethanol 20, glycerin 2, deionized water 65.

[0042] Wherein, the length of the carbon fiber is 5 mm, and the surfactant is polysorbate, sodium dioctyl succinate sulfonate, sodium dodecylbenzene sulfonate.

[0043] The method for preparing above-mentioned high-hardness boron nitride ceramics comprises the following specific steps:

[0044] (1) Mix boron nitride, alumina, kaolin powder, zirconia powder, calcium oxide powder, titanium dioxide powder, carbon black powder, antimony trioxide powder, and deionized water into a grinding ball equipped with high-purity alumina Mill in a ball mill tank for 80 minutes, then add polyethylene, absolut...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
lengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses high-hardness silicon nitride ceramic and a preparing method thereof. The high-hardness silicon nitride ceramic is characterized by being prepared from, by weight, 85-115 parts of silicon nitride, 1-6 parts of aluminum oxide, 2-7 parts of kaoline powder, 0.6-2 parts of zirconium oxide powder, 1.5-4 parts of calcium oxide powder, 2-6 parts of titanium dioxide powder, 1.5-3.5 parts of antimony trioxide powder, 0.6-3 parts of carbon fibers, 0.05-0.3 part of surfactant, 0.5-3 parts of polyethylene, 20-30 parts of absolute ethyl alcohol, 2-5 parts of glycerol and 65-75 parts of deionized water. The strength of the silicon nitride ceramic is improved obviously, the technology is simple and reasonable, and the raw materials are easy to obtain.

Description

technical field [0001] The invention relates to a high-hardness boron nitride ceramic and a preparation method thereof, belonging to the technical field of ceramic production. Background technique [0002] Boron nitride ceramics have high mechanical strength, high chemical stability, good thermal conductivity and good thermal shock stability, etc. These characteristics make them widely used in machining and other fields. However, boron nitride ceramics are difficult to process. Boron nitride is a typical covalently bonded stable compound with a low diffusion coefficient. It is difficult to achieve densification by conventional sintering methods. It is necessary to add some sintering aids to reduce the surface density. It can or increase the surface area, and adopt special process to obtain dense boron nitride ceramics to improve the strength and yield of finished products. At present, the main boron nitride sintering methods are reaction sintering and pressureless sintering....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/583C04B35/78C04B35/622
Inventor 徐明
Owner 徐明