Method for preparing silicon carbide refractory material by taking polycarbosilane as binding agent

A technology of polycarbosilane and refractory materials, which is applied in the field of preparing silicon carbide refractory materials, and can solve problems such as low operating temperature, low grade of silicon carbide refractory materials, and difficulty in preparing thick-sized products.

Active Publication Date: 2014-03-26
LUOYANG SHENJIA KILN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems that the silicon carbide refractory materials prepared by the current existing methods are of low grade, or the use temperature is not high, and the thick-sized products

Method used

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  • Method for preparing silicon carbide refractory material by taking polycarbosilane as binding agent
  • Method for preparing silicon carbide refractory material by taking polycarbosilane as binding agent

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Embodiment 1

[0032] Polycarbosilane is used as a binder, and silicon carbide particles (particle sizes are 1.43-2.5mm, 0.5-1.43mm, 240 mesh, 2000 mesh) are used to form raw materials, and the mass percentages are 3% and 67% respectively. , 10%, 15%, 5% of the proportion of weighing. The above raw materials were kneaded on a planetary forced mixer for 10 minutes, and the uniformly mixed materials were machine-pressed into a green body, and then the green body was dried in an oven at 100°C for 6 hours. The dried samples were placed in a vacuum furnace and sintered at 1300 °C for 5 h. see figure 1 , the phase composition of the product detected by XRD is mainly silicon carbide phase, a small amount of Si 2 N 2 O is due to slight oxidation of the sample during sintering; see figure 2 , after the precursor is sintered, a large number of fibrous nano-whiskers are formed inside the product; the product body density is 2.55g cm -3 , The flexural strength is 30.6MPa.

Embodiment 2

[0034] Polycarbosilane is used as a binder, and silicon carbide particles (particle sizes are 1.43-2.5mm, 0.5-1.43mm, 240 mesh, 2000 mesh) are used to form raw materials, and the mass percentages are 7% and 60% respectively. , 8%, 16%, 9% weighing. The above raw materials were kneaded on a planetary forced mixer for 20 minutes, and the uniformly mixed materials were pounded to form a green body, and then the green body was dried in an oven at 110°C for 4 hours. The dried samples were placed in an argon atmosphere furnace and sintered at 1500 °C for 1 h. The phase composition of the product detected by XRD is mainly silicon carbide phase, and the volume density of the product is 2.58g cm -3 , The flexural strength is 31.1MPa.

Embodiment 3

[0036] Polycarbosilane is used as a binder, and silicon carbide particles (particle sizes are 1.43-2.5mm, 0.5-1.43mm, 240 mesh, 2000 mesh) are used to form raw materials, and the mass percentages are 10% and 55% respectively. , 5%, 20%, 10% of the proportion of weighing. The above raw materials were kneaded on a planetary forced mixer for 5 minutes, and the uniformly mixed materials were machine-pressed to form a green body, and then the green body was dried in an oven at 80°C for 12 hours. The dried samples were placed in a vacuum furnace and sintered at 1400 °C for 3 h. The phase composition of the product detected by XRD is mainly silicon carbide phase, and the volume density of the product is 2.6g cm-3 , The flexural strength is 35.4MPa.

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Abstract

The invention discloses a method for preparing a silicon carbide refractory material by taking polycarbosilane as a binding agent. According to the method, a raw material is made up of a silicon carbide precursor, namely, polycarbosilane, as a binding agent, and silicon carbide in grain composition, and the silicon carbide formed through in-situ reaction in the sintering process of polycarbosilane is used as binding phase to ultimately prepare a pure silicon carbide product. The added polycarbosilane plays the role of the binding agent in the pressing process, so that a blank has certain strength, the operability is improved, and meanwhile the polycarbosilane can be converted into silicon carbide in situ in the sintering process, so that the function of binding silicon carbide grains is achieved, and the property of a silicon carbide refractory material product is improved.

Description

technical field [0001] The invention relates to a method for preparing a silicon carbide refractory material, in particular to a method for preparing a silicon carbide refractory material by using polycarbosilane as a binder. Background technique [0002] Silicon carbide refractories are widely used in various smelting furnace linings, high-temperature kiln components, supports, crucibles and non-ferrous metal smelting due to their excellent properties such as high temperature strength, high thermal conductivity, high temperature resistance, corrosion resistance and impact resistance. Industrial high-temperature indirect heating materials and other fields. [0003] At present, the preparation of silicon carbide refractories can be divided into those that are bonded with silicon dioxide, those that are bonded with clay, those that are bonded with alumina, and those that are bonded with silicon nitride. The biggest feature of silicon carbide refractories is their high strengt...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/567C04B35/634C04B35/622
Inventor 蔡泽
Owner LUOYANG SHENJIA KILN
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