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Grain boundary enhanced nitride bonded silicon carbide kiln furniture

A silicon carbide kiln and nitride technology, which is applied in the field of grain boundary enhanced nitride combined with silicon carbide kiln furniture, can solve the problems of high firing temperature, complicated process and expensive raw materials, and achieves good oxidation resistance and thermal conductivity. High and stable mechanical properties

Active Publication Date: 2021-03-16
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The patent "An anti-corrosion silicon carbide shelving board and its preparation method" with the application number "201510402345.4" discloses a technical solution that introduces 10-15% graphene, the firing temperature is 2100-2300°C and finally uses plasma spraying two Molybdenum sulfide and grease achieve high strength, the raw materials used are expensive, the firing temperature is high, and the process is complicated

Method used

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  • Grain boundary enhanced nitride bonded silicon carbide kiln furniture
  • Grain boundary enhanced nitride bonded silicon carbide kiln furniture
  • Grain boundary enhanced nitride bonded silicon carbide kiln furniture

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Embodiment 1

[0026] The composition of a grain boundary enhanced nitride bonded silicon carbide kiln furniture: the proportion of silicon carbide is 70%, the proportion of nitride is 20%, and the proportion of oxide film is 10%; hydrogenated amorphous silicon with a critical particle size of 90nm is nitridated to generate nitrogen The proportion of compound is 10%, the nitriding temperature is 1550°C, the pre-oxidation temperature is 1550°C, the apparent porosity of the product is 6.0%, and the bulk density is 2.79g / cm 3 , Normal temperature strength 60.0Mpa, 1400℃ high temperature strength 70.0Mpa, 1550℃×50h (saturated water vapor oxidation) △m% is 0.8%, △V% is 0.5%.

Embodiment 2

[0028] The composition of a grain boundary enhanced nitride bonded silicon carbide kiln furniture is: the proportion of silicon carbide is 87%, the proportion of nitride is 10%, and the proportion of oxide film is 3%. The proportion of nitrides formed by the nitridation reaction of hydrogenated amorphous silicon with a critical particle size of 80nm is 1%. The nitriding temperature is 1400°C, the pre-oxidation temperature is 1400°C; the apparent porosity of the product is 12.8%, and the bulk density is 2.68g / cm 3 , Normal temperature strength 50.0Mpa, 1000℃ high temperature strength 55.0Mpa, 1550℃×50h (saturated water vapor oxidation) △m% is 1.8%, △V% is 2.0%.

Embodiment 3

[0030] The composition of a grain boundary enhanced nitride bonded silicon carbide kiln furniture is: the proportion of silicon carbide is 78%, the proportion of nitride is 15%, and the proportion of oxide film is 7%. The proportion of nitrides formed by the nitridation reaction of hydrogenated amorphous silicon with a critical particle size of 50nm is 5%. The nitriding temperature is 1450°C, and the pre-oxidation temperature is 1500°C. The apparent porosity of the product is 9.0%, and the bulk density is 2.74g / cm 3 , Normal temperature strength 50.0Mpa, 1000℃ high temperature strength 55.0Mpa, 1550℃×50h (saturated water vapor oxidation) △m% is 1.3%, △V% is 1.5%.

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Abstract

The invention relates to a grain boundary enhanced nitride combined silicon carbide kiln furniture which takes a nitride and oxide film as a combined phase and silicon carbide as a main crystalline phase. The grain boundary enhanced nitride combined silicon carbide kiln furniture is composed of 10-20% of nitride, 3-10% of oxide film and 70-87% of silicon carbide. The nitride comprises a nitride generated by carrying out a nitridation reaction on hydrogenated amorphous silicon at 1,400-1,550 DEG C in a nitrogen atmosphere and another nitride; the content of nitride generated by nitridation reaction of hydrogenated amorphous silicon in a nitrogen atmosphere at 1,400-1,550 DEG C in the grain boundary enhanced nitride combined silicon carbide kiln furniture is 1-10%. The material has the characteristics of high heat conductivity coefficient, high high-temperature strength and good oxidation resistance, and is beneficial to stabilization of mechanical properties of related kiln furniture materials such as shed plates and stand columns under the condition of long-term use.

Description

technical field [0001] The present invention relates to a silicon carbide refractory material, and relates to a grain boundary enhanced nitride bonded silicon carbide refractory material. The grain boundary enhanced nitride bonded silicon carbide refractory material is the key to be used in industries such as alumina ceramics and lining bricks. A supporting material for kiln furniture, in particular to a grain boundary enhanced nitride bonded silicon carbide kiln furniture. Background technique [0002] Nitride bonded silicon carbide kiln furniture has a high market share in the alumina ceramic ball industry, especially for medium and high alumina ceramic balls with a firing temperature of 1500°C~1580°C and an alumina content of 92% and 95%. It has a high cost performance and has monopolized the industry for more than ten years. The normal loss (according to the output of alumina ceramic balls) caused by the oxidation and decay of silicon carbide materials is about 6.5kg / to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/66
CPCC04B35/565C04B35/66C04B2235/3873C04B2235/3418C04B2235/46C04B2235/428C04B2235/96C04B2235/77
Inventor 曹会彦张新华万龙刚程竹李杰黄志刚石会营吴吉光许海洋相宇博
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES