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Method for manufacturing silicon carbide ceramics based on silane-zirconium aluminate two-component coupling agent

A technology of coupling agent silicon carbide and a manufacturing method, which is applied in the field of high-density silicon carbide ceramic manufacturing, and can solve the problems of high cost of sol-gel, reduced density, large-scale industrial waste water, etc.

Inactive Publication Date: 2010-12-15
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sol-gel is costly, time-consuming, and produces a large amount of industrial wastewater, which makes it difficult to adapt to industrial production requirements.
[0008] In fact, YAG starts to produce liquid phase at 1760°C, but it is difficult for us to make high-density (>98%) silicon carbide ceramics at a temperature of about 1800°C. The key is whether the YAG sintering aid can be completely wrapped in the carbide Around the silicon particles, those parts that are not covered by YAG are difficult to fuse through their own thermal diffusion in the absence of liquid phase at a lower temperature of about 1800 ° C, resulting in voids in the matrix and a decrease in density

Method used

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  • Method for manufacturing silicon carbide ceramics based on silane-zirconium aluminate two-component coupling agent
  • Method for manufacturing silicon carbide ceramics based on silane-zirconium aluminate two-component coupling agent

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: get 97wt% silicon carbide powder (average particle size is 5 microns), 3wt% silane coupling agent γ-aminopropyltriethoxysilane mixture, in high-energy ball mill (rotating speed is 300r / min, ball material ratio 5) grinding for 3 hours to obtain material I; 68wt%Al 2 o 3 , 27wt% Y 2 o 3 , 5wt% trade mark is that the aluminum-zirconium coupling agent of C grinds 4 hours and obtains material II in high-energy ball mill (rotating speed is 300r / min, ball-to-material ratio is 5); 90wt% material I, 6wt% material II, 4wt% PVA was mixed and ball-milled in a high-energy ball mill for 6 hours to obtain a sintered precursor powder. The precursor powder was dried at 80°C for 2 hours, crushed and sieved, put into a cylindrical mold and allowed to stand at 230Mpa for 5 minutes to obtain a green body. The green body was heat treated at 250° C. for 20 minutes to remove the PVA binder. Place the biscuit in a vacuum carbon tube furnace to evacuate to a vacuum degree of 5...

Embodiment 2

[0020] Embodiment 2: get 98wt% silicon carbide powder (average particle size is 5 microns), 2wt% silane coupling agent cyclohexylaminopropyl methyl dimethoxysilane mixture, in high-energy ball mill (rotating speed is 300r / min, Ball-to-material ratio is 5) grinds 5 hours and obtains material I; With 50wt%Al 2 o 3 , 48wt% Y 2 o 3 , 2wt% trade mark is the aluminum zirconium coupling agent of CPM in high-energy ball mill (rotating speed is 300r / min, ball-to-material ratio is 5) grinding obtains material II for 6 hours; 88wt% material I, 8wt% material II, 4wt% PVA was mixed and ball-milled in a high-energy ball mill for 9 hours to obtain a sintered precursor powder. The precursor powder was dried at 80°C for 2 hours, crushed and sieved, put into a cylindrical mold and allowed to stand at 230Mpa for 5 minutes to obtain a green body. The green body was heat treated at 250° C. for 20 minutes to remove the PVA binder. Place the biscuit in a vacuum carbon tube furnace to evacuate t...

Embodiment 3

[0021] Embodiment 3: get 95wt% silicon carbide powder (average particle size is 5 microns), 5wt% silane coupling agent triaminopropyl methyl dimethoxysilane mixture, in high-energy ball mill (rotating speed is 300r / min, ball Material ratio is 5) grinding obtains material I in 4 hours; With 35wt%Al 2 o 3 , 60wt% Y 2 o 3 , 5wt% trade mark is that the aluminum-zirconium coupling agent of CPG is ground in high-energy ball mill (rotating speed is 300r / min, ball-to-material ratio is 5) and grinds material II for 8 hours; 93wt% material I, 5wt% material II, 2wt% PVA was mixed and ball-milled in a high-energy ball mill for 10 hours to obtain a sintered precursor powder. The precursor powder was dried at 80°C for 2 hours, crushed and sieved, put into a cylindrical mold and allowed to stand at 230Mpa for 5 minutes to obtain a green body. The green body was heat treated at 250° C. for 20 minutes to remove the PVA binder. Place the biscuit in a vacuum carbon tube furnace to evacuate ...

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Abstract

The invention relates to a method for manufacturing silicon carbide ceramics based on a silane-zirconium aluminate two-component coupling agent, which is characterized by adopting a silane-zirconium aluminate two-component coupling agent bonded SiC-Al2O3-Y2O3 system, wherein Al2O3 and Y2O3 are sintering auxiliary agents of the system; the two-component coupling agent forms firm chemical bonding on the surface of the main SiC and the surfaces of the auxiliary agents of Al2O3 and Y2O3 by hydroxyl; meanwhile, the two coupling agents are mutually bonded on the surface layer of the main SiC by carboxyl and amidogen to form a firm and dense sintering auxiliary agent coating; and main raw materials of SiC powder (0.5-5microns), a silane coupling agent A, a zirconium aluminate coupling agent B and sintering auxiliary agents of Al2O3 and Y2O3 (smaller than 200nano) are subjected to the main process steps of screening, moulding, solidification, high-temperature sintering, and the like after high-energy ball-milling by steps to form a silicon carbide ceramic product. In the method, dense silicon carbide ceramics with the relative density beyond 98 percent can be prepared by sintering at the low temperature of 1,800 DEG C through simple process, thereby greatly reducing the energy consumption in the production process of silicon carbide.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing high-density silicon carbide ceramics at low temperature. Background technique [0002] Silicon carbide ceramic materials have excellent characteristics such as high temperature strength, high temperature oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness, thermal shock resistance and chemical corrosion resistance. Automobiles, mechanical chemicals, environmental protection, space technology, information electronics, energy and other fields have increasingly wide applications, and have become an irreplaceable structural ceramic with excellent performance in many industrial fields. [0003] The dynamic seal in mechanical equipment is carried out through the rotation and sliding of two sealing end materials. As the sealing end material, it is required to have high hardness and wear resis...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/565
Inventor 水淼任元龙舒杰王青春黄峰涛宋岳
Owner NINGBO UNIV