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Method for manufacturing low-temperature high-density silicon carbide ceramics based on silane coupling agent

A silane coupling agent and silicon carbide ceramic technology, which is applied in the field of high-density silicon carbide ceramic manufacturing, can solve the problems of time-consuming, high sol-gel cost, and difficulty in adapting to industrialized production requirements.

Inactive Publication Date: 2013-04-10
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 low-temperature high-density silicon carbide ceramics based on silane coupling agent
  • Method for manufacturing low-temperature high-density silicon carbide ceramics based on silane coupling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: get 97wt% silicon carbide powder (average particle size is 0.5-5 micron), 3wt% silane coupling agent γ-aminopropyltriethoxysilane mixture, in high-energy ball mill (rotating speed is 300r / min, ball Material ratio is 5) grinding obtains material I in 3 hours; With 68wt%Al 2 o 3 , 27wt% Y 2 o 3 , 5wt% silane coupling agent chloropropyltrimethoxysilane was ground in a high-energy ball mill (rotating speed is 300r / min, ball-to-material ratio is 5) to grind material II for 4 hours; 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...

Embodiment 2

[0021] Embodiment 2: get 98wt% silicon carbide powder (average particle size is 0.5-5 micron), 2wt% silane coupling agent cyclohexylaminopropyl methyl dimethoxysilane mixture, in high energy ball mill (rotating speed is 300r / Minutes, ball-to-material ratio is 5) grinding 5 hours obtains material I; With 50wt%Al 2 o 3 , 48wt% Y 2 o 3 , 2wt% silane coupling agent γ-propyl methacrylate trimethoxysilane was ground in a high-energy ball mill (rotating speed is 300r / min, ball-to-material ratio is 5) to grind material II for 6 hours; 85wt% material I, 10wt %Material II and 5wt%PVA were 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 furn...

Embodiment 3

[0022] Embodiment 3: get 95wt% silicon carbide powder (average particle size is 0.5-5 micron), 5wt% silane coupling agent hexamethylenediaminomethyltriethoxysilane mixture, in high-energy ball mill (rotating speed is 300r / min, Ball-to-material ratio is 5) grinds 4 hours and obtains material I; With 35wt%Al 2 o 3 , 62wt%Y 2 o 3 , 3wt% silane coupling agent vinyltriethoxysilane was ground in a high-energy ball mill (rotating speed is 300r / min, ball-to-material ratio is 5) to grind for 8 hours to obtain material II; 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 t...

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Abstract

The invention relates to a method for manufacturing low-temperature high-density silicon carbide ceramics based on double-component silane coupling agent. The invention is characterized in that the SiC-Al2O3-Y2O3 system bonded by double-component silane coupling agent is adopted; Al2O3 and Y2O3 are used as the sintering additives of the system; the coupling agent is hydrolyzed by alkoxy groups toform firm chemical bonds on the surfaces of the main body SiC and the additives Al2O3 and Y2O3; a firm and dense sintering additive coating layer is formed on the surface layer of the main body silicon carbide by the group reaction between the two coupling agents; and the main material silicon carbide powder (0.5-5 micrometers), double-component silane coupling agent, and sintering additives Al2O3, Y2O3 (smaller than 200 nanometers) are processed by step-by-step high-energy ball milling, screening, molding, solidifying, sintering at high temperature and the like to form the silicon carbide ceramics. The method can be used for manufacturing dense silicon carbide ceramics the density of which exceeds 98%, at the low temperature of 1800 DEG C by using a simple sintering process, thereby greatly reducing the energy consumption in the silicon carbide production process.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/64C04B35/63C04B35/565
Inventor 水淼任元龙舒杰王青春黄峰涛宋岳
Owner NINGBO UNIV