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A kind of ternary composite silicon carbide refractory material and preparation method thereof

A technology of composite silicon carbide and refractory materials, which is applied in the field of refractory materials, can solve the problems of difficulty in improving the quality of silicon carbide refractory materials, difficulty in producing chemical bonding, unstable product quality, etc., to achieve good wettability, weaken thermal stress, The effect of lowering the thermal expansion coefficient

Active Publication Date: 2020-05-29
JINGDEZHEN CERAMIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) Most of the raw materials used in the prior art (such as mullite, corundum, etc.) are mainly artificially synthesized, and the silicon carbide aggregate is a mixture of two solid phases, which is not only difficult to mix evenly, but also The combination of the two belongs to physical contact, and it is difficult to produce chemical bonding, so it is easy to cause shortcomings such as unstable product quality and low strength, making it difficult to improve the quality of silicon carbide refractories
[0005] (2) The thermal expansion coefficient of mullite and corundum is high (the thermal expansion coefficient of the former is 5.3×10 -6 ·℃ -1 , the latter is 8.8×10 -6 ·℃ -1 ), resulting in generally high coefficient of thermal expansion and poor thermal shock resistance for this related product

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  • A kind of ternary composite silicon carbide refractory material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] 1. A ternary composite silicon carbide refractory material in this embodiment includes a base material and a binder. The base material is composed of silicon carbide aggregate (80-325 mesh) 30wt%, andalusite (180 mesh) 30wt%, α-Al 2 o 3 (325 mesh) 20wt%, cordierite (325 mesh) 20wt%, the binding agent is a PVA solution with a concentration of 5wt%, and its consumption is 8wt% of the base material.

[0024] 2. In this embodiment, a corundum-silicon carbide composite ceramic material using natural minerals as raw materials is as follows:

[0025] After mixing the above-mentioned base materials, add a binder and mix them evenly; after stirring and trapping the materials, select an appropriate pressure according to the size of the product for compression molding, and dry at a temperature of 110°C to obtain a green body (moisture content in the kiln <0.5%); then Firing at 1300°C for 1 hour, the cordierite-mullite-silicon carbide refractory material is obtained.

Embodiment 2

[0027] 1. In this embodiment, a ternary composite silicon carbide refractory material includes a base material and a binder. The base material is composed of silicon carbide aggregate (60-325 mesh) 35wt%, sillimanite (180 mesh) 40wt% , γ-Al 2 o 3 (325 mesh) 15wt%, cordierite (325 mesh) 10wt%, the binding agent is a PVA solution with a concentration of 5wt%, and its consumption is 10wt% of the base material.

[0028] 2. In this embodiment, a corundum-silicon carbide composite ceramic material using natural minerals as raw materials is as follows:

[0029] After mixing the above-mentioned base materials, add a binder and mix them evenly; after stirring and trapping the materials, select an appropriate pressure according to the size of the product for compression molding, and dry at a temperature of 110°C to obtain a green body (moisture content in the kiln <0.5%); then Firing at 1400°C for 1 hour, the cordierite-mullite-silicon carbide refractory material is obtained.

Embodiment 3

[0031] 1. In this embodiment, a ternary composite silicon carbide refractory material includes a base material and a binder. The base material is composed of silicon carbide aggregate (60-325 mesh) 30wt%, kyanite (180 mesh) 25wt% , Al(OH) 3 (325 mesh) 30wt%, cordierite (325 mesh) 15wt%, the binding agent is a PVA solution with a concentration of 5wt%, and its consumption is 6wt% of the base material.

[0032] 2. In this embodiment, a corundum-silicon carbide composite ceramic material using natural minerals as raw materials is as follows:

[0033] After mixing the above-mentioned base materials, add a binder and mix them evenly; after stirring and trapping the materials, select an appropriate pressure according to the size of the product for compression molding, and dry at a temperature of 110°C to obtain a green body (moisture content in the kiln <0.5%); then Firing at 1340°C for 2 hours, the cordierite-mullite-silicon carbide refractory material is obtained.

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Abstract

The invention discloses a ternary composite silicon carbide refractory material, which comprises a base material and a binder. The base material is composed of 30-40 wt% silicon carbide aggregate, 10-55 wt% silicate minerals, 5-35wt% of the base material, 10-35wt% of the cordierite, and the amount of the binder is 6-12wt% of the base material. In addition, a preparation method of the above-mentioned ternary composite silicon carbide refractory material is also disclosed. The present invention introduces a high-strength, low-expansion mullite-cordierite matrix between silicon carbide aggregate particles as a binding phase by in-situ synthesis, effectively solving the problem of difficulty in mixing uniform synthetic powder and aggregate in the prior art. The problem of difficult combination avoids the resulting technical defects such as low strength and poor thermal shock resistance, and significantly improves the quality of silicon carbide refractories. The process of the invention is simple, not only reduces the firing temperature, but also greatly reduces the manufacturing cost, has broad market prospects, and is conducive to promoting the progress of industrial technology and application development.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a ternary composite silicon carbide refractory material and a preparation method thereof. Background technique [0002] Refractory materials are widely used in metallurgy, cement, glass, ceramics and other industries, and their quality is directly related to the quality and production cost of fired products. Due to long-term use at high temperatures, refractory materials need to have high strength, low thermal expansion, high fire resistance, high creep resistance and other properties, as well as good thermal and chemical stability. Silicon carbide is widely used as a refractory material due to its high temperature strength, high load softening temperature, good thermal stability and thermal conductivity. [0003] The material system of existing silicon carbide refractories is mainly clay-silicon carbide, mullite-silicon carbide, etc., that is, silicon carbide is us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/567C04B35/622C04B35/634
CPCC04B35/565C04B35/622C04B35/63416C04B35/66C04B2235/3217C04B2235/3218C04B2235/3463C04B2235/3481C04B2235/96C04B2235/9607
Inventor 劳新斌江伟辉梁健徐贵荣苗立锋李亚格
Owner JINGDEZHEN CERAMIC UNIV