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Preparation method of lamellar silicon carbide/zirconium carbide ultrahigh-temperature ceramic

A technology of ultra-high-temperature ceramics and silicon carbide, which is applied in the field of preparation of ultra-high-temperature ceramics, can solve problems such as easy generation of air bubbles and affect material properties, and achieve the effects of preventing stress from spreading, good dispersion, and avoiding air bubbles

Active Publication Date: 2015-04-01
嘉兴睿创新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (CN101844925A) provides a process for preparing multilayer zirconium boride-silicon carbide composite ultra-high temperature ceramic materials by casting method, which overcomes the limitation of soft interlayer toughening, but in the casting process, Easy to generate bubbles, affecting the performance of the material

Method used

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  • Preparation method of lamellar silicon carbide/zirconium carbide ultrahigh-temperature ceramic
  • Preparation method of lamellar silicon carbide/zirconium carbide ultrahigh-temperature ceramic

Examples

Experimental program
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Embodiment 1

[0029] Mix 45g of silicon carbide powder with a particle size of about 800nm, 12g of polymethacrylate, 12g of polyethylene glycol, and 231g of absolute ethanol in a beaker, and ultrasonically disperse it in a water bath at 60°C for 1 hour. Add 3g of n-octanol to the mixture, mix well, and pour the slurry into a glass mold. After drying at room temperature for 6 hours, a silicon carbide cast sheet is obtained, and the thickness of the layer is about 0.8mm. Zirconium carbide (zirconium carbide powder) is obtained by the same method particle size of 30nm) casting sheet. Silicon carbide casting sheets and zirconium carbide casting sheets are alternately stacked and put into a vacuum sintering furnace for debinding. The heating rate is 10°C / min, and the temperature is kept at 600°C for 1.5 hours to obtain layered silicon carbide / zirconium carbide Green body of ultra-high temperature ceramics. Finally, the green body was put into a graphite mold and sintered in a vacuum hot-pressin...

Embodiment 2

[0031] Mix 45g of silicon carbide powder with a particle size of about 10μm, 7.5g of polymethacrylate, 7.5g of polyethylene glycol, and 240g of absolute ethanol in a beaker, and ultrasonically disperse it in a water bath at 60°C for 1 hour. Add 4.5g n-octanol in the beaker, mix well, obtain slurry and pour in the glass mould, after drying at room temperature for 6 hours, obtain silicon carbide casting sheet, layer thickness is 0.6mm, and similar method makes zirconium carbide (zirconium carbide Powder particle size is 25nm) casting sheet. Silicon carbide casting sheets and zirconium carbide casting sheets are alternately stacked and placed in a vacuum sintering furnace for debinding. The heating rate is 8°C / min, and they are kept at 600°C for 1.2 hours to obtain layered silicon carbide / zirconium carbide Green body of ultra-high temperature ceramics. Finally, the green body was put into a graphite mold and sintered in a vacuum hot-pressing sintering furnace. The sintering temp...

Embodiment 3

[0033]Mix 45g of silicon carbide powder with a particle size of about 5μm, 15g of polymethacrylate, 15g of polyethylene glycol, and 225g of absolute ethanol in a beaker, and ultrasonically disperse it in a water bath at 60°C for 1 hour. Add 3.5g n-octanol to the mixture, mix well, and pour the slurry into a glass mould. After drying at room temperature for 6 hours, a silicon carbide casting sheet is obtained, and the layer thickness is 0.7mm. The same method is used to obtain zirconium carbide (zirconium carbide powder Particle size is 35nm) casting sheet. Silicon carbide casting sheets and zirconium carbide casting sheets are alternately stacked and placed in a vacuum sintering furnace for debinding. The heating rate is 5°C / min, and they are kept at 600°C for 1.0 hours to obtain layered silicon carbide / zirconium carbide Green body of ultra-high temperature ceramics. Finally, the green body was put into a graphite mold and sintered in a vacuum hot-pressing sintering furnace. ...

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Abstract

The invention belongs to the technical field of preparation of an ultrahigh-temperature ceramic, and particularly relates to a preparation method of a lamellar silicon carbide / zirconium carbide ultrahigh-temperature ceramic. The preparation method comprises the following steps of: preparing a silicon carbide tape-casting sheet and a zirconium carbide tape-casting sheet by adopting a tape-casting method; then alternately stacking the silicon carbide tape-casting sheet and the zirconium carbide tape-casting sheet; then carrying out glue discharge and vacuum sintering. According to the preparation method, the usage amounts of polymethyl methacrylate, polyethylene glycol, ethanol and n-octyl alcohol are limited, so that a prepared tape-casting sheet is smooth in surface and generates no bubble; the glue discharge, sintering temperature, temperature increase speed and sintering pressure are limited in regulation and control, so that the prepared lamellar ultrahigh-temperature ceramic has the advantages of clearness in interface, moderation in strength and good ceramic compactness and is enhanced in fracture toughness by changing a crack propagation path.

Description

technical field [0001] The invention belongs to the technical field of preparation of ultra-high temperature ceramics, and in particular relates to a preparation method of layered silicon carbide / zirconium carbide ultra-high temperature ceramics. Background technique [0002] Layered composite structure design is one of the methods of ceramic toughening, which is a bionic mechanism design based on biological materials such as shells. Usually layered composite ceramics are made by adding different materials or tougher interlayers between brittle ceramic layers. The material of this structure is an energy dissipation structure in the stress field, which can overcome the Achilles heel of sudden fracture of ceramics. Silicon carbide and zirconium carbide ultra-high temperature ceramic composite materials have the advantages of high temperature resistance, corrosion resistance, and oxidation resistance. In recent years, they have become a research hotspot of ultra-high temperatu...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/565C04B35/622C04B35/634B32B18/00
Inventor 栗媛媛李庆刚王志史国普吴超刘美佳
Owner 嘉兴睿创新材料有限公司
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