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A kind of preparation method of the composite ceramics resisting pest

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

Active Publication Date: 2019-05-17
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 preparation method of a PEST-resistant composite ceramic, the steps are as follows:

[0014] Weigh MoSi in proportion 2 91.8g, C 3g, B 4 C 5g, Si 0.1g, B 0.1g, ball milled for 48hr after uniform mixing. After adding the above powder into a mixture of 20 g of phenolic resin and alcohol, mix and mold it. Air dry and then dry in a 110 degree oven. Move to the vacuum sintering furnace covered with 12g metal silicon powder for sintering. The heating rate is 3°C / min, and the vacuum degree is 10 -3 Pa or so. Raise the temperature to 1400-1430°C and keep it for 30 minutes; after filling with argon, raise the temperature to 1500°C and keep it for 30 minutes. Raise the temperature to 1550°C, keep it warm for 10 minutes, and keep the vacuum at 10 -3 Pa, and then cooled with the furnace, the temperature was lowered to take out the material, and then heated in an air furnace at 500 °C for 3 hours. The measured residual strength of the composite ceramic was 130 MPa, and no ...

Embodiment 2

[0016] A preparation method of a PEST-resistant composite ceramic, the steps are as follows:

[0017] Weigh MoSi in proportion 2 90.5g, C3.75g, B0.25g, B 4 C 5g, Si 0.5g, ball milled for 48hr after uniform mixing. After adding the above powder into the mixture of 25g of phenolic resin and alcohol, mix and mold. Air dry and then dry in a 110 degree oven. Move to a vacuum sintering furnace covered with 15g metal silicon powder for sintering. The heating rate is 5°C / min, and the vacuum degree is 10 -3 Pa or so. Raise the temperature to 1400-1430°C and keep it for 20 minutes; after filling with argon, raise the temperature to 1500°C and keep it for 20 minutes. Raise the temperature to 1550°C, keep it warm for 10 minutes, and keep the vacuum at 10 -3 Pa. Then cool with the furnace, cool down and take the material. Then it was heated in an air furnace at 500°C for 3 hours, and the residual strength of the composite ceramic was measured to be 127 MPa. No 'PEST' ​​phenomeno...

Embodiment 3

[0019] A preparation method of a PEST-resistant composite ceramic, 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, ball mill for 48hr after uniform mixing. After adding the above powder into a mixture of 30 g of phenolic resin and alcohol, mix and mold it. Air dry and then dry in a 110 degree oven. Move to the 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. Raise the temperature to 1400-1430°C and keep it for 20 minutes; after filling with nitrogen, raise the temperature to 1500°C and keep it for 25 minutes. Raise the temperature to 1550°C, keep it warm for 15 minutes, and the vacuum degree is 10 -3 Pa. Then cool with the furnace, cool down and take the material. Then it was heated in an air furnace at 500°C for 3 hours, and the residual strength of the composite ceramic was measured to be 119 MPa. No 'PEST' ​​pheno...

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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 preparation technology of 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 perspective of high-temperature materials, although metal matrix composites have good comprehensive properties, due to their high cost, they are limited to aerospace, and only metal materials reinforced with particles or short fibers have the possibility of being widely used in civilian applications. Due to the intermetallic compound MoSi 2 , with high melting point (2030°C), moderate density (6.24×10 3 kg / m 3 ), good...

Claims

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Application Information

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Patent Type & Authority Patents(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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