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Refractory material as well as preparation method and applications thereof

A refractory material and silicon dioxide technology, applied in the field of refractory materials, can solve the problems of scarcity of resources, unstable quality of sand and powder, difficulty in eliminating differences, etc., and achieve the effect of low price, good social and economic benefits

Inactive Publication Date: 2014-01-08
广东凯斯特尔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural zircon / sand has the following defects and deficiencies: (1) Scarcity, natural zircon / sand is a mineral resource with few reserves on the earth and scarce resources
(2) The difference in quality, natural zircon / sand in the process of natural mineralization due to different ore-forming conditions, resulting in differences in its active ingredients and impurities, existing processing methods are difficult to eliminate the difference
Causes the unstable quality of sand and powder produced by its processing
(3) Radioactivity. Natural zircon / sand will be associated with radioactive elements such as radium, uranium, and hafnium during the mineralization process, and they all have certain radioactivity, which will cause adverse effects on the environment and human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 2.8 tons of aluminum oxide (Al2O3) powder with a purity of 99.9% and 1.21 tons of quartz sand with a silicon dioxide content of 99%, and mix them well to become a spare mixture. Take 500KG of aluminum oxide powder with a purity of 99.9% and put it into the electric arc furnace, start the arc with a voltage of 205V and a current of 3500A, and the melting temperature is 1970 degrees. After the aluminum oxide powder is completely melted, the current is adjusted to 3000 amps, and the melting temperature is adjusted to 1950 degrees. After that, add the spare mixture into the electric arc furnace at a constant speed of 1 ton per hour. After all the spare mixture is put into the furnace and fully melted, add 700KG of aluminum oxide powder with a purity of 99.9% into the electric arc furnace. The melting temperature is 1950 degrees, after the added aluminum oxide powder is completely melted, stop the furnace. After three days, wait for the furnace charge to completely coo...

Embodiment 2

[0029] Take 7 tons of aluminum oxide (Al2O3) powder with a purity of 99.99% and 2 tons of quartz sand with a silicon dioxide content of 98.5%, and mix them thoroughly to become a spare mixture for use. Take 400KG of aluminum oxide powder with a purity of 99.99% and add it to the electric arc furnace, start the arc with a voltage of 260V and a current of 4000A, and the melting temperature is 2010 degrees. After the aluminum oxide powder is completely melted, the current is adjusted to 3500 amps and the melting temperature is adjusted to 1990 degrees. After that, add the spare mixture into the electric arc furnace at a constant speed of 1.2 tons per hour. After all the spare mixture is put into the furnace and fully melted, add 600KG of aluminum oxide powder with a purity of 99.99% into the electric arc furnace. The melting temperature is 1990 degrees, after the added aluminum oxide powder is completely melted, stop the furnace. Three days later, after the furnace charge is com...

Embodiment 3

[0031] Take 23.75 tons of aluminum oxide (Al2O3) powder with a purity of 99.9% and 5.25 tons of quartz sand with a silicon dioxide content of 99%, and mix them well to become a spare mixture for use. Take 2.6 tons of aluminum oxide powder with a purity of 99.9% and add it to the electric arc furnace, start the arc with a voltage of 280V and a current of 4800A, and the melting temperature is 2050 degrees. After the aluminum oxide powder is completely melted, the current is adjusted to 4300 amps, and the melting temperature is adjusted to 2030 degrees. After that, add the spare mixture into the electric arc furnace at a constant speed of 1.7 tons per hour. After all the spare mixture is put into the furnace and fully melted, add 3.4 tons of aluminum oxide powder with a purity of 99.9% into the electric arc furnace. It is 2030 degrees, and after the added aluminum oxide powder is completely melted, stop the furnace. Three days later, after the furnace charge is completely cooled...

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PUM

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Abstract

The invention discloses a refractory material. The refractory material comprises the following compositions in percentage by weight: 10%-30% of silicon dioxide, and 70%-90% of alumina. A preparation method comprises the steps: by taking quartz sand containing more than 98% of high-purity industrial aluminum powder and silicon dioxide as raw materials, performing high-temperature melting to generate a blocky corundum phase and mullite phase co-existed aluminum silicate complex phase crystal structure. The refractory material is abundant in raw materials, stable in quality, environment-friendly and low-cost. The refractory material has enough high refractoriness, proper heat-conducting coefficient and small linear expansion coefficient, and can be used as a refractory material for a surface layer of a mold case precisely cast by silica sol instead of the original zircon sand.

Description

technical field [0001] The invention relates to a refractory material, in particular to a refractory material which can be used for the shell surface layer in the field of silica sol precision casting. Background technique [0002] "Silica sol type membrane shell" has been recognized by the global silicon precision casting field as the best process plan for producing precision castings. Its main features are: high casting surface quality, low repair rate, low scrap rate, good quality stability, wide material applicability, etc. The cost performance of investment castings largely depends on the quality and cost of the "shell", which is not only determined by the binder but also closely related to the refractory materials (sand, powder) that account for 90% of the shell material by weight. At present, the refractory material for the surface layer of the mold shell commonly used in the field of silica sol precision casting in the world is sand and powder made of natural zircon...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 何林壮
Owner 广东凯斯特尔科技有限公司
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