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Method for synthesizing MgAlON/beta-sialon composite ceramic material

A technology of multiphase ceramics and synthesis method, applied in the field of refractory materials, can solve the problems of high difficulty, complex composition and high cost, and achieve the effects of good mechanical properties, pollution reduction and efficient utilization

Inactive Publication Date: 2011-11-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the composition of pure raw coal gangue and used refractories, it is more difficult to simply separate out the purer phases, and the cost is higher, which is one of the reasons why solid waste is often simply piled up and buried

Method used

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  • Method for synthesizing MgAlON/beta-sialon composite ceramic material
  • Method for synthesizing MgAlON/beta-sialon composite ceramic material
  • Method for synthesizing MgAlON/beta-sialon composite ceramic material

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Embodiment 1

[0022] The raw materials are coal gangue, used skateboard brick powder, used magnesia-carbon brick powder and carbon black, and their ratios are shown in Table 1. At a temperature of 1600° C., ordinary nitrogen (purity: 99.5%) was passed through, and the multi-phase material was synthesized at normal pressure for 4 hours.

Embodiment 2

[0024] The raw materials are coal gangue, used skateboard brick powder, used magnesia-carbon brick powder and carbon black, and their ratios are shown in Table 2. At a temperature of 1650° C., ordinary nitrogen gas (purity 99.5%) was introduced, and the multi-phase material was synthesized at normal pressure for 6 hours. Carry out X-ray diffraction analysis to synthetic sample 2, the result is as follows figure 2 shown. It can be seen that magnesium allon and β-sialon are the main phases in the carbon thermal reduction synthesis phase, which has a high nitrogen oxide phase content. Analysis shows that the content of magnesium allon in the composite material is 86%, and β-sialon The content of longan is 14%.

[0025] image 3 It is the SEM photo of sample 2. It can be seen that the large particle phase is a synthetic magnesium-Aron phase, and the columnar β-sialon is interspersed and anchored between the large particles, which will help improve the thermodynamic properties ...

Embodiment 3

[0027] The raw materials are coal gangue, used skateboard brick powder, used magnesia-carbon brick powder and carbon black, and their ratios are shown in Table 3. Common nitrogen gas (99.5% purity) was introduced at a temperature of 1650° C., and the multi-phase material was synthesized at normal pressure for 4 hours.

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Abstract

The invention discloses a method for synthesizing an MgAlON / beta-Sialon diphase ceramic material, which belongs to the technical field of structural ceramics and refractory materials. According to the mixture ratio, synthetic raw materials of the invention comprises 1 to 40 percent of coal gangue, 45 to 90 percent of the used slide gate brick powder, 5 to 15 percent of the used magnesia carbon brick powder, and 2 to 12 percent of carbon. The raw materials are mixed and then are subjected to heat treatment synthesis in nitrogen atmosphere, the synthesis temperature is between 1,500 and 1,850 DEG C, the holding time is between 1 and 10 hours, the nitrogen pressure is between 0.1 and 20MPa, and the synthesized diphase material comprises 65 to 95 percent of MgAlON and 5 to 35 percent of beta-Sialon. The method has low synthesis cost, is favorable for reducing the pollution of solid waste to the environment, can also utilize the coal gangue and a small amount of carbon residue in a used refractory material as a reducing agent for a carbothermal reduction nitridation reaction to further reduce the synthesis cost, and provide a new way for the application of the solid waste such as the coal gangue and the used refractory material; and the synthesized diphase material has better mechanical property.

Description

Technical field: [0001] The invention belongs to the field of refractory materials, and in particular relates to a method for synthesizing magnesium aron / β-sialon composite materials by carbothermal reduction and nitriding using coal gangue and used refractory materials as main raw materials. Background technique: [0002] Coal gangue is a mineral associated with coal, and its inorganic components are mostly more than 80%. my country is a large coal country, and its raw coal reserves rank first in the world, accounting for 60-70% of my country's energy, but it also causes billions of tons of waste. Coal gangue, a large amount of coal gangue piled up like a mountain, not only occupies land, but also a lot of coal gangue spontaneously ignites in the air because it contains some carbon, and at the same time releases a large amount of harmful gas, becoming a secondary pollution source and causing serious environmental pollution. my country's iron and steel industry has developed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/599C04B35/622
Inventor 张梅岳昌盛郭敏彭犇王习东
Owner UNIV OF SCI & TECH BEIJING