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Low-temperature hot-pressing sintering method of boron nitride multi-phase ceramic side sealing plate

A technology of multiphase ceramics and hot pressing sintering, which is applied in the field of sintering boron nitride multiphase ceramic side sealing plates, can solve the problems of high sintering temperature, reduced mechanical properties, residual sintering aids, etc., so as to reduce sintering temperature and reduce preparation Effects of cost, good thermal shock resistance and friction and wear resistance

Active Publication Date: 2015-12-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of high sintering temperature and excessive residue of low melting point sintering aids in the preparation of existing boron nitride composite ceramics, which leads to the reduction of mechanical properties, the invention provides a low-temperature hot-pressing sintering of side sealing plates of boron nitride composite ceramics method

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0017] Specific implementation mode 1: In this implementation mode, the low-temperature hot-pressing sintering method of the boron nitride composite ceramic side sealing plate is as follows:

[0018] 1. Mix the boron-containing compound, transition metal oxide and silicon carbide according to the molar ratio of 3-6:(3-8):5 and add it to the dispersion medium. After ball milling for 10-48 hours, heat the Vacuum dry at high temperature for 10 to 48 hours, then ball mill and crush the dried mixed powder through a 200-mesh sieve to obtain a uniformly mixed composite sintering aid powder;

[0019] 2. Add the composite sintering aid powder and boron nitride powder into the dispersion medium according to the volume ratio of (10~25):(75~90), after ball milling for 24 hours, dry at 100℃~150℃ for 24h , and then passing the dried mixed powder through a 200-mesh standard sieve to obtain a uniformly mixed boron nitride-based composite powder;

[0020] 3. Put the boron nitride-based compos...

specific Embodiment approach 2

[0027] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the dispersion medium in step 1 is an aqueous ethanol solution or absolute ethanol with an ethanol content of 55-95%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the boron-containing compound, transition metal oxide and silicon carbide are mixed according to the molar ratio of 3:3:5 and then added to the dispersion medium middle. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a low-temperature hot-pressing sintering method of a boron nitride multi-phase ceramic side sealing plate and relates to a boron nitride multi-phase ceramic side sealing plate sintering method. The invention aims at solving the technical problem that the mechanical performance is decreased for reasons that the sintering temperature during boron nitride multi-phase ceramic preparation is high and low-melting-point sintering assistants are excessively remained. The method comprises the following steps: 1) preparing composite sintering assistant powder; 2) preparing boron nitride composite powder; 3) containing the boron nitride composite powder in a hot-pressing mold and performing sintering at three stages to obtain the boron nitride multi-phase ceramic side sealing plate. The compactness of the boron nitride multi-phase ceramic side sealing plate prepared through 1300 to 1400 DEG C hot-pressing sintering by adopting the method disclosed by the invention can reach more than 96 percent, the crystal grains of the boron nitride multi-phase ceramic material are fine, the comprehensive mechanical performance is excellent and the anti-bending strength can reach 300MPa. The invention belongs to the field of preparation of multi-phase ceramic side sealing plates.

Description

technical field [0001] The invention relates to a sintering method of a boron nitride composite ceramic side sealing plate. Background technique [0002] Hexagonal boron nitride ceramic material has the advantages of high-temperature self-lubrication, low thermal expansion coefficient, high thermal conductivity, good thermal shock resistance, good high-temperature chemical stability, good peeling of solidified matter, and no infiltration with molten metal. It is an important member of the family of advanced ceramic materials and can be widely used in key engineering fields such as aerospace, high temperature bearing, heat wave protection, metal smelting, and high temperature friction and wear. However, boron nitride has physical characteristics such as high melting point, strong covalent bond and low self-diffusion coefficient, and it is easy to form a card house structure during sintering, which is difficult to destroy even if external force is applied. Using the general c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/645C04B35/583
Inventor 陈磊王玉金姚绵懿贾德昌周玉
Owner HARBIN INST OF TECH
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