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Low-porosity corundum and preparation method thereof

A low-porosity, corundum technology, applied in the field of refractory materials, can solve the problems of heat resistance, strength, toughness, and structural stability, and achieve the effects of low porosity, narrow spacing, and improved structural density

Pending Publication Date: 2019-03-15
贵州大东风机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Corundum has strong acid and alkali resistance, good dimensional stability, good molding, stable crystal phase, and high hardness. It is widely used in the reinforcement and toughening of various plastics, rubber, ceramics, refractory materials and other products; Generally, the porosity of corundum is as high as 30%-45%, and its crystal has a needle-like structure or a plate-like structure. Products made of this corundum will inevitably suffer from heat resistance, strength, toughness and structural stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The low porosity corundum of this embodiment is composed of the following raw materials based on the percentage of the total weight of the raw materials: 90% alumina, 5% yttrium oxide, and 5% lanthanum oxide.

[0023] Specifically, the alumina in this embodiment is preferably alumina with high purity, so as to reduce the impact of impurity elements in alumina on the product. For example, the amount of impurity element sodium in alumina is relatively large. At high temperature, that is, during the transformation process of γ-alumina crystal form to α-alumina, sodium reacts with another impurity element boron in alumina to form Gaseous sodium tetraborate, driven by the chemical potential, the gaseous substance continuously escapes from the alumina lattice to the melt surface, thereby destroying the crystal structure of alumina. In addition, for alumina products with different needs, the requirements for the purity of alumina are also different; the purity of alumina affec...

Embodiment 2

[0038] The present embodiment 2 is similar to the embodiment 1, and the difference from the embodiment 1 is that the low porosity corundum of the present embodiment is composed of the following raw materials according to the percentage of the total weight of the raw materials: 95% alumina, oxidized Yttrium 3.5%, Lanthanum oxide 1.5%.

[0039] In this embodiment, the upper components are taken in proportion, and the preparation method of this embodiment is the same as in Example 1; the porosity of the obtained low porosity corundum is 0.6%, and the density of the obtained low porosity corundum is 4.10g / cm 3 .

Embodiment 3

[0041] The present embodiment 3 is similar to the embodiment 1, and the difference from the embodiment 1 is that the low porosity corundum of the present embodiment is composed of the following raw materials according to the percentage of the total weight of the raw materials: 98% alumina, oxidized Yttrium 1.5%, Lanthanum oxide 0.5%.

[0042] In this embodiment, the upper component is taken according to the proportion, and the preparation method of this embodiment is the same as that in Example 1; the porosity of the obtained low-porosity corundum is 0.9%, and the density of the obtained low-porosity corundum is 4.0g / cm 3 .

[0043] After many experiments, it is found that the performance of the corundum with low porosity obtained in Examples 1-3 is good; the porosity of the formed corundum is below 1%, and the density is 4.0g / cm 3 The above; thereby improving the heat resistance, toughness and stability of corundum, so that the products formed by using it for production hav...

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Abstract

The invention discloses low-porosity corundum and a preparation method thereof. The low-porosity corundum comprises the following raw materials by weight percentage: 90%-98% of aluminium oxide, 1.5%-5% of yttrium oxide and 0.5%-5% lanthanum oxide. The preparation method comprises the following steps: weighing the raw materials by weight percentage, uniformly mixing aluminium oxide, yttrium oxide and lanthanum oxide, and then transferring the mixture to an electric melting furnace for electrofusion; allowing aluminium oxide, yttrium oxide and lanthanum oxide to be completely melted; continuingto keep the melt temperature, performing refining, and preforming natural cooling crystallization after refining is completed to obtain a spheroidal crystal, namely the low-porosity corundum. The low-porosity corundum provided by the invention contains 95% or more than 95% of an alpha-aluminium oxide phase, and the porosity of the low-porosity corundum can reach 1% or less than 1%, therefore, thelow-porosity corundum has the advantages of low porosity, good heat resistance, good toughness and strong stability.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to corundum with low porosity and a preparation method thereof. Background technique [0002] Corundum has strong acid and alkali resistance, good dimensional stability, good molding, stable crystal phase, and high hardness. It is widely used in the reinforcement and toughening of various plastics, rubber, ceramics, refractory materials and other products; Generally, the porosity of corundum is as high as 30%-45%, and its crystals are needle-like or plate-like. Products made of this corundum will inevitably suffer from heat resistance, strength, toughness and structural stability. Therefore, reducing the porosity of corundum and changing the crystal structure of corundum have practical significance for improving the properties of corundum. Contents of the invention [0003] Therefore, in view of the above-mentioned problems, the object of the present invention is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/3225C04B2235/3227C04B2235/5436C04B2235/77
Inventor 钟行佳黄昌辉王小多张宝贵
Owner 贵州大东风机械有限公司
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