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Beta-SiC combined SiC refractory material with low binding phase content as well as preparation method and product thereof

A refractory material and bonding phase technology, applied in the field of refractory materials, can solve the problems of low purity of silicon carbide refractory material, complex preparation process, low content of bonding phase, etc., and achieve high density, simple preparation method and low energy consumption for firing Effect

Active Publication Date: 2022-08-05
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of complex preparation process, unfriendly to the environment and low purity of the prepared silicon carbide refractory in the existing self-bonded silicon carbide refractory technology, and to provide a β-SiC bonded β-SiC with low bonded phase content SiC refractory material and its preparation method and product

Method used

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  • Beta-SiC combined SiC refractory material with low binding phase content as well as preparation method and product thereof
  • Beta-SiC combined SiC refractory material with low binding phase content as well as preparation method and product thereof
  • Beta-SiC combined SiC refractory material with low binding phase content as well as preparation method and product thereof

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Embodiment 1

[0061] Raw materials and formulas used: more than 98% silicon carbide particles, 5-3mm accounting for 5%, 3-1.5mm accounting for 20%, 1.5-0.5mm accounting for 35%, 0.5-0mm accounting for 15%; more than 97% carbide Silicon fine powder - 320 mesh accounts for 12%, more than 95% silicon carbide powder D50 = 8.0μm accounts for 7.5%; 98% metal silicon powder - 320 mesh adds 3.5%, and the weight ratio of ball clay and silica powder is 1: 2. Add 2.0%; particle size-320 mesh MoSi 2 Plus 0.1%. In the preparation of mud, the above-mentioned raw materials are fully mixed with phenolic resin with a residual carbon rate of 40%, and 4.0% of phenolic resin is added. It is molded into a 600×400×100mm green body, and the molding density is 2.84g·cm -3 , drying temperature 130 ℃, drying time 12h. The furnace is fired in an electric heating atmosphere, and the air in the furnace is removed in advance by passing argon gas. During the firing process, a slight positive pressure of 120mm water co...

Embodiment 2

[0069] Raw materials and formula used: more than 98% silicon carbide particles, 5-3mm accounted for 25%, 3-1.5mm accounted for 12%, 1.5-0.5mm accounted for 25%, 0.5-0mm accounted for 8%; more than 97% carbide Silicon fine powder-240 mesh accounts for 24%, silicon carbide micropowder above 95% D50=3.0μm accounts for 2%; 98% metal silicon powder-320 mesh adds 2.1%, silicon dioxide micropowder adds 1.9%; -320 mesh MoSi 2 1:1 with ferrosilicon plus 0.2%. When preparing the mud, the above-mentioned raw materials are fully mixed with the phenolic resin with a residual carbon rate of 55%, and 3.4% of the phenolic resin is added. It is molded into a green body of 695×470×165mm, and the molding density is 2.85g·cm -3 , drying temperature 120 ℃, drying time 15h. The furnace is fired in an electric heating atmosphere, and the air in the furnace is removed in advance by passing through argon. The bulk density of the product after burning is 2.80g cm -3 , the content of β-SiC binding ...

Embodiment 3

[0071]The raw materials and formula used, more than 98% of silicon carbide particles, 5-3mm accounted for 15%, 3-1.5mm accounted for 10%, 1.5-0.5mm accounted for 25%, 0.5-0mm accounted for 15%; more than 97% carbide Silica fine powder - 240 mesh accounts for 17%, more than 95% silicon carbide powder D50 = 5.0μm accounts for 12%; 98% metal silica powder - 320 mesh accounts for 4.8%, ball clay and activated alumina powder 2:1 add 1.2%; -320 mesh silicon manganese and ferrosilicon alloy 2:1 plus 0.15%. When preparing mud, the above-mentioned raw materials are fully mixed with phenolic resin with a residual carbon rate of 50%, and 4.2% of phenolic resin is added. It is molded into a 400×350×70mm green body, and the molding density is 2.80g·cm -3 , drying temperature 130 ℃, drying time 12h. The furnace is fired in an electric heating atmosphere, and the air in the furnace is removed in advance by passing through argon. During the firing process, a slight positive pressure of 150m...

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Abstract

The invention discloses a beta-SiC combined SiC refractory material with low binding phase content as well as a preparation method and a product thereof, and belongs to the technical field of refractory materials. The beta-SiC combined SiC refractory material with the low binding phase content comprises a binding phase and a principal crystalline phase, the binding phase is beta-SiC, and the mass percentage of the binding phase is 3%-7%; the main crystal phase is alpha-SiC, and the mass percentage of the main crystal phase is 92%-95%; and the beta-SiC binding phase covers the surface of the main crystal phase in a nanowire form. The liquid-state high-viscosity organic matter adopted by the invention is a carbon source and a binder, and the formability of the pug and the ignition loss in the sintering process can be ensured by adjusting the addition amount and the residual carbon rate of the liquid-state high-viscosity organic matter, so that the density of a finished product is ensured. The beta-SiC combined SiC refractory material disclosed by the invention is low in binding phase content, the purity of silicon carbide can reach 96% or above, the preparation method is simple, the sintering process is carried out in a low-temperature, micro-pressure and oxygen-free atmosphere, the environment pollution is avoided, and the sintering energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a β-SiC combined SiC refractory material with low binding phase content and a preparation method and products thereof. Background technique [0002] There are existing reports in the international market that self-bonding silicon carbide refractory products of the same material are mainly used for the lining of high-temperature furnaces such as iron-making blast furnaces and waste incineration ash melting furnaces. Among them, self-bonding silicon carbide products for iron-making blast furnaces have some applications in China. In the preparation process, in order to improve the molding performance of the mud, micro-powder-grade raw materials, shaped aggregate particles, machine pressing and casting are usually added. Mostly at 2.55-2.70g·cm -3 Within the range, the SiC content is more than 80%; the F.C content is not more than 4%, and the SiC content of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/565C04B35/622C04B35/64
CPCC04B35/66C04B35/565C04B35/622C04B35/64C04B2235/3418C04B2235/428C04B2235/349C04B2235/3217C04B2235/9607C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96Y02W30/91
Inventor 吕春江黄志刚李杰张新华吴吉光王文武常赪王建栋
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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