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ZrB2-SiC composite powder and preparation method thereof

A composite powder, zrb2-sic technology, applied in the field of ZrB2-SiC composite powder and preparation, high-performance ceramic powder or new refractory material and preparation, can solve the problems of high price, limitation of refractory materials, etc., and achieve synthesis time Short, promote sintering, low synthesis temperature effect

Inactive Publication Date: 2013-05-08
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the current ZrB 2 Expensive, a large number of problems that are limited for refractory materials, the purpose of the present invention is to provide a more excellent performance, cheaper ZrB for refractory materials 2 -SiC composite powder

Method used

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  • ZrB2-SiC composite powder and preparation method thereof
  • ZrB2-SiC composite powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Weigh 42g of finely ground zircon, 35g of boric acid, 23g of carbon black powder, and add a small amount of Y 2 o 3 Put it into a ball mill jar as a catalyst, use absolute ethanol as the medium, and dry the mixed powder after ball milling for 3 hours. The mixed powder is pressed into a green body of Φ20mm×20mm with a pressure of 50MPa, and the green body is dried and put into a microwave oven. Vacuumize the furnace before heating up, then feed high-purity argon (>99.9%), and keep the furnace pressure at 0.1MPa throughout the heating process. Heat the green body to 900°C at a heating rate of 15°C / min, then heat the green body to 1450°C at a heating rate of 30°C / min and keep it for 30 minutes, and cool it to room temperature with the furnace after the holding. Take out the green body after the heat treatment, then grind for 1 hour and pass through a 200 mesh sieve to obtain the figure 1 The particle size shown is less than 200 mesh, and the purity is about 97...

Embodiment 2

[0038] Example 2: Weigh 50g of finely ground zircon, 22g of boron trioxide, 28g of activated carbon powder, and add a small amount of AlF 3 Put it into a ball mill jar as a catalyst, use absolute ethanol as the medium, and dry the mixed powder after ball milling for 9 hours. The mixed powder is pressed into a green body of Φ20mm×20mm with a pressure of 100MPa, and the green body is dried and put into a microwave oven. Vacuumize the furnace before heating up, then feed high-purity argon (>99.9%), and keep the furnace pressure at 0.1MPa throughout the heating process. Heat the green body to 900°C at a heating rate of 45°C / min, then heat the green body to 1480°C at a heating rate of 80°C / min and hold it for 60 minutes, and cool it to room temperature with the furnace after the holding. Take out the green body after heat treatment, then grind for 2 hours and pass through a 200 mesh sieve to obtain ZrB with a particle size of less than 200 mesh and a purity of about 96%. 2 -SiC co...

Embodiment 3

[0039] Example 3: Weigh 37g of finely ground zircon, 43g of borax, 20g of activated carbon powder, and add a small amount of FeCl 3 Put it into a ball mill jar as a catalyst, use absolute ethanol as the medium, and dry the mixed powder after ball milling for 15 hours. The mixed powder is pressed into a green body of Φ20mm×20mm with a pressure of 100MPa, and the green body is dried and put into a microwave oven. Vacuumize the furnace before heating up, then feed high-purity argon (>99.9%), and keep the furnace pressure at 0.1MPa throughout the heating process. Heat the green body to 900°C at a heating rate of 50°C / min, then heat the green body to 1400°C at a heating rate of 150°C / min and keep it warm for 120 minutes. Take out the green body after heat treatment, then grind for 1 hour and pass through a 200 mesh sieve to obtain ZrB with a particle size of less than 200 mesh and a purity of about 95%. 2 -SiC composite powder.

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Abstract

The invention discloses ZrB2-SiC composite powder and a preparation method thereof. According to the invention, zircon sand, a boron raw material and a carbon raw material are adopted as main materials. The main materials are mixed, grinded, and are heated under a temperature of 1350 to 1480 DEG C, such that the powder is obtained. The powder comprises components of, by weight: 37 to 63% of ZrSiO4, 16 to 32% of B2O3, and 20 to 28% of C, wherein the boron raw material is calculated according to the amount of B2O3, and the carbon raw material is calculated according to the amount of C element. According to the invention, natural zircon sand with a relatively low price is used as a raw material for producing high-grade ZrB2-SiC. The advantages of ZrB2 and SiC are combined. Mutual complement of advantages can be realized when ZrB2 and SiC are used in the field of high-temperature materials. ZrB2-SiC provides relatively high thermal conductivity, excellent thermal shock resistance and corrosion resistance. When ZrB2-SiC is introduced into the composite powder, high-temperature mechanical properties, oxidative stabilities and corrosion resistances of ultra-high temperature ceramics and refractory materials can be improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and relates to a high-performance ceramic powder or a new refractory material and a preparation method, in particular to a ZrB 2 -SiC composite powder and its preparation method. technical background [0002] ZrB 2 With high melting point, low thermal expansion coefficient, high thermal conductivity and excellent thermal shock resistance and corrosion resistance, ZrB 2 It also has good oxidation resistance in an oxidizing atmosphere below 1100 ° C, so it has good application prospects in the fields of ultra-high temperature ceramics and refractory materials. [0003] But when the temperature exceeds 1100°C, the B produced by oxidation 2 o 3 Volatilization leads to a rapid decline in its antioxidant capacity, which limits the ZrB 2 applications at higher temperatures, and due to the ZrB 2 The high price limits its extensive application in refractory materials. St...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/58C04B35/565C04B35/626
Inventor 刘新红钟香崇周超杰贾全利葛铁柱张磊
Owner ZHENGZHOU UNIV
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