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Preparation method of PEST resistant composite ceramics

A technology of composite ceramics and total mass is applied in the field of low-cost preparation of new high-temperature strength ceramics, which can solve the problems of reducing the service life of molybdenum disilicide and achieve the effect of low preparation cost

Active Publication Date: 2017-01-04
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We know that molybdenum disilicide (MoSi 2 ) is usually used under high temperature environmental conditions, every time the temperature rises, it will pass through this low temperature range, and this is often repeated, molybdenum disilicide (MoSi 2 ) service life will be greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for preparing composite ceramics resistant to PEST, the steps are as follows:

[0014] Weigh MoSi in proportion 2 91.8g, C 3g, B 4 C 5g, Si 0.1g, B0.1g, uniformly mixed and ball milled for 48 hours. After adding the above powder to 20g of a mixture of phenolic resin and alcohol, mixing and compression molding. After drying in the air, it is dried in an oven at 110 degrees. Move to a vacuum sintering furnace with 12g of metal silicon powder for sintering. The heating rate is 3℃ / min, and the vacuum degree is 10 -3 Around Pa. The temperature is increased to 1400-1430°C and the temperature is maintained for 30 minutes; after being filled with argon, the temperature is increased to 1500°C and the temperature is maintained for 30 minutes. Warm up to 1550℃, keep for 10min, vacuum degree is 10 -3 Pa, then the furnace is cooled, the temperature is lowered and the material is taken, and then heated in an air furnace at 500°C for 3 hours. The residual strength of the comp...

Embodiment 2

[0016] A method for preparing composite ceramics resistant to PEST, the steps are as follows:

[0017] Weigh MoSi in proportion 2 90.5g, C3.75g, B 0.25g, B 4 C 5g, Si 0.5g, uniformly mixed and ball milled for 48hr. After adding the above powder to 25g of a mixture of phenolic resin and alcohol, mixing and molding. After drying in the air, it is dried in an oven at 110 degrees. Move to a vacuum sintering furnace spread with 15g of metallic silicon powder for sintering. The heating rate is 5℃ / min, and the vacuum degree is 10 -3 Around Pa. The temperature is increased to 1400-1430°C and the temperature is kept for 20 minutes; after filling with argon, the temperature is raised to 1500°C and the temperature is kept for 20 minutes. Warm up to 1550℃, keep for 10min, vacuum degree is 10 -3 Pa. Then it is cooled with the furnace, and the temperature is lowered to take the material. Then it was heated in an air furnace at 500°C for 3 hours, and the residual strength of the composite...

Embodiment 3

[0019] A method for preparing composite ceramics resistant to PEST, the steps are as follows:

[0020] Weigh MoSi in proportion 2 95g, C 1.25g, B 4 C 5g, B 0.5g, Si 0.25g, uniformly mixed and ball milled for 48hr. After adding the above powder to 30g of a mixture of phenolic resin and alcohol, mixing and compression molding. After drying in the air, it is dried in an oven at 110 degrees. Move to a vacuum sintering furnace covered with 18g metal silicon powder for sintering. The heating rate is 5°C / min, and the vacuum degree is about 10-3Pa. The temperature is increased to 1400-1430°C and the temperature is kept for 20 minutes; after nitrogen is filled, the temperature is raised to 1500°C and the temperature is kept for 25 minutes. Heat up to 1550℃, keep for 15min, and the vacuum degree is 10 -3 Pa. Then it is cooled with the furnace, and the temperature is lowered to take the material. Then it was heated in an air furnace at 500°C for 3 hours, and the residual strength of th...

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Abstract

The invention discloses a preparation method of PEST resistant composite ceramics. The method comprises the following steps of (1) uniformly mixing C, Si, B, B4C and MoSi2; then, adding bonding agents; performing ball milling, material mixing, compression moulding forming and drying to obtain a blank material; (2) transferring the blank material into a vacuum sintering furnace with Si powder; maintaining the vacuum degree at 10<-2> to 10<-3> Pa; maintaining the temperature rise speed at 1 to 10 DEG C / min; then, performing heat insulation for 5 to 60min at 1400 to 1430 DEG C; then, inflating nitrogen gas or argon gas; raising the temperature to 1450 to 1500 DEG C; performing heat insulation for 5 to 60min; performing vacuum pumping; raising the temperature to 1500 to 1550 DEG C; performing heat insulation for 5 to 40min; finally performing cooling to obtain the composite ceramics. The PEST resistant composite ceramics obtained by the method have low preparation cost and are suitable for industrial mass production.

Description

Technical field [0001] The invention relates to a technology for preparing composite ceramics resistant to ‘PEST’, and belongs to the technical field of low-cost preparation of novel high-temperature strength ceramics. Background technique [0002] The three most important parameters for selecting high-temperature structural materials for aviation are the melting point, specific gravity and high-temperature oxidation resistance of the substance. High temperature ceramics are widely used in aviation, aerospace, metallurgy and transportation fields. From the point of view of high-temperature materials, although metal matrix composites have good overall performance, due to their high cost, they are only limited to aerospace. Metal materials reinforced with particles or short fibers are likely to be widely promoted for civilian use. Due to the intermetallic compound MoSi 2 , With high melting point (2030°C), moderate density (6.24×10 3 kg / m 3 ), good thermal and electrical conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/65
CPCC04B35/58092C04B35/65C04B2235/3821C04B2235/3891C04B2235/421C04B2235/422C04B2235/428C04B2235/602
Inventor 张小立孙斌李佳科沈松钦
Owner ZHONGYUAN ENGINEERING COLLEGE
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