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Alpha-SiAlON/BN composite ceramic material and preparation method thereof

A technology of composite ceramics and raw materials, applied in the field of composite ceramic materials, to achieve high-temperature mechanical properties, simple preparation process, and good thermal shock resistance

Inactive Publication Date: 2011-06-15
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are no patent reports on α-SiAlON / BN composite ceramics abroad

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  • Alpha-SiAlON/BN composite ceramic material and preparation method thereof
  • Alpha-SiAlON/BN composite ceramic material and preparation method thereof
  • Alpha-SiAlON/BN composite ceramic material and preparation method thereof

Examples

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Embodiment 1

[0028] It is doped with yttrium oxide with a purity higher than 99.9%, and uses α-phase silicon nitride, aluminum nitride and aluminum oxide powder as raw materials. Select the dosing point in the α-SiAlON single-phase plane, according to the molecular formula Y m / 3 Si 12-(m+n) Al m+n o n N 16-n Calculate the mass percentage of silicon nitride, aluminum nitride, aluminum oxide and yttrium oxide in the raw material powder when 1.0<m<1.5, n=1.4, and then weigh hexagonal boron nitride according to 20% of the total mass of the above powder Powder, weighed powder in a polytetrafluoroethylene tank, using absolute ethanol as a dispersion medium, silicon nitride balls as a ball milling medium, and ball milling for 24 hours. After the mixed slurry is dried, it is put into a graphite mold covered with graphite paper, and then the mold filled with powder is placed in a hot-press furnace. In order to prevent the powder from sticking to the graphite mold, graphite paper is used to sep...

Embodiment 2

[0030] Compared with Example 1, the molecular formula of its Y-α-SiAlON ceramics is Y m / 3 Si 12-(m+n) Al m+n o n N 16-n , where m=1.2, 0.8<n<1.5, the dosage of hexagonal boron nitride is 5% of the total mass of Y-α-SiAlON powder, and the specific preparation method is the same as in Example 1.

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Abstract

The invention relates to an alpha-SiAlON / BN composite ceramic material and a preparation method thereof. The preparation method comprises the following steps: adopting the hot pressing sintering technology and alpha-silicon nitride powder, aluminum nitride powder, alumina powder and yttrium oxide powder as raw materials to design components according to the general formula of alpha-SiAlON, namelyYm / 3Si12-(m+n)Alm+nOnN16-n, wherein m and n are the parameters of the selected components; and adding hexagonal boron nitride, performing ball milling to the raw powder, drying, granulating, filling in a graphite mould, heating in a heating rate of 10-40 DEG C / min under dynamic nitrogen atmosphere to 1800-1950 DEG C, and sintering for 30-120min under 15-35MPa. The alpha-SiAlON / BN composite ceramic prepared by the method of the invention is characterized by high temperature resistance and high high-temperature strength.

Description

technical field [0001] The invention belongs to the technical field of composite ceramic materials, and specifically relates to a preparation method of α-SiAlON / BN composite ceramic materials. Background technique [0002] α-SiAlON (α') is suitable for use in harsh environments due to its good thermal stability, chemical stability and excellent mechanical properties, and is a very excellent structural engineering material. Compared with silicon nitride, α-SiAlON has the advantage of being easy to sinter, and after sintering, the liquid phase can be solid-dissolved into the α-SiAlON lattice, thereby reducing the grain boundary glass phase and improving high-temperature performance. Hexagonal boron nitride has good chemical inertness, self-lubrication, small dielectric constant, excellent thermal shock resistance and machinability, especially its lamellar lamellar crystal structure and comparative The large anisotropic thermal expansion characteristics make it more and more w...

Claims

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Application Information

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IPC IPC(8): C04B35/599C04B35/622
Inventor 单英春徐久军王光
Owner DALIAN MARITIME UNIVERSITY
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