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Method for preparing fine-grain high-strength high-purity alumina ceramics

A technology of high-purity alumina and alumina ceramics is applied in the technical field of preparing fine-grained, high-strength, and high-purity alumina ceramics and low-temperature pressureless sintering, and can solve the problems of being unsuitable for large-scale industrial production, high cost, and large investment. Achieve the effect of fine grain, lower sintering temperature and high strength

Active Publication Date: 2011-03-30
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the pressureless sintering process, the above process requires special sintering equipment, high investment and high cost, and is not suitable for large-scale industrial production

Method used

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  • Method for preparing fine-grain high-strength high-purity alumina ceramics
  • Method for preparing fine-grain high-strength high-purity alumina ceramics
  • Method for preparing fine-grain high-strength high-purity alumina ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Put 8000g of high-purity alumina ceramic balls and 800g of domestic commercial high-purity alumina powder into the sand mill, then add 1600g of deionized water as the grinding medium, and add 1.6ml of organic dispersant DOLAPIX CE 64 [by Sima Chemical Co., Ltd. Provided by the company], 4g inorganic dispersant (NH 4 ) 2 SO 4 , 0.4g of sintering aid MgO, wet grinding for 3 hours; put the ground slurry in a 90°C oven, and dry for 24 hours; pass through a 200-mesh nylon sieve, and then put it in a muffle furnace for calcination at 600°C for 2 Hours; after dry pressing and cold isostatic pressing at 200 MPa, the alumina ceramic green body is obtained; the alumina ceramic green body is placed in a muffle furnace and sintered at 1450°C for 2 hours without pressure to obtain alumina Ceramic samples.

[0036] The high-purity alumina ceramic balls used refer to alumina ceramic balls with an alumina content greater than 99.9% and a diameter of 3 mm.

[0037] The domestic comm...

Embodiment 2

[0050] The only difference between this example and Example 1 is that the alumina ceramic green body is placed in a muffle furnace and subjected to pressureless sintering at 1500° C. for 2 hours to obtain an alumina ceramic sample.

[0051] The rest of the content is exactly the same as described in Example 1.

[0052] The present invention also tested the relative density, flexural strength and Vickers hardness of the alumina ceramic samples prepared in this example according to the test method described in Example 1, and the test results are shown in Table 2.

[0053] The cross-sectional morphology of the alumina ceramic sample test strip prepared in this embodiment is shown in Figure 6 shown by Figure 6 It can be seen that the density of the alumina ceramics prepared in this example is higher than that of the alumina ceramics prepared in Example 1, but the grain size is slightly larger, about 3 μm.

Embodiment 3

[0055] The only difference between this example and Example 1 is that the alumina ceramic green body is placed in a muffle furnace and subjected to pressureless sintering at 1550° C. for 2 hours to obtain an alumina ceramic sample.

[0056] The rest of the content is exactly the same as described in Example 1.

[0057] The present invention also tested the relative density, flexural strength and Vickers hardness of the alumina ceramic samples prepared in this example according to the test method described in Example 1, and the test results are shown in Table 2.

[0058] The cross-sectional morphology of the alumina ceramic sample test strip prepared in this embodiment is shown in Figure 7 shown by Figure 7 It can be seen that the density of the alumina ceramics prepared in this example is significantly higher than that of the alumina ceramics prepared in Example 1, but the grain size is significantly larger, reaching about 5 μm.

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Abstract

The invention discloses a method for preparing fine-grain high-strength high-purity alumina ceramics, which comprises the following steps of: firstly, adding high-purity alumina ceramic balls and domestic commercial high-purity alumina powder into a sand mill according to the mass ratio of 10:1; using deionized water as grinding media; adding a proper amount of organic dispersing agents DOLAPIX CE 64, inorganic dispersing agents (NH4)2SO4 and sintering addition agents MgO for wet process grinding for 2 to 4 hours; then, drying obtained pulp materials for 20 to 30 hours at 80 to 100 DEG C; sieving the materials by a nylon sieve of 200 meshes; placing the sieved materials in a muffle furnace to be calcined for 1 to 3 hours at 550 to 650 DEG C; obtaining alumina ceramic biscuits through cold isostatic pressing treatment after dry pressing molding; and finally, placing the biscuits into the muffle furnace for pressureless sintering for 1 to 3 hours at 1450 to 1600 DEG C. The method has simple preparation process, low raw material cost and low temperature sintering, reduces the energy consumption and is applicable to large-scale production.

Description

technical field [0001] The invention relates to a method for preparing fine-grained, high-strength, and high-purity alumina ceramics, specifically, a method for preparing fine-grained, high-strength, and high-purity alumina ceramics using domestic commercialized high-purity alumina powder as raw material and low-temperature pressureless sintering technology. A method for aluminum ceramics belongs to the technical field of preparation of alumina ceramic materials. Background technique [0002] Alumina ceramics have been developed for more than half a century. Because of their excellent mechanical properties, electrical properties, and chemical stability, as well as wide sources of raw materials and low manufacturing costs, they are ideal for manufacturing high-performance ceramics such as high strength, wear resistance, and high temperature resistance. The basic material of ceramic components is widely used in the fields of machinery, communication, semiconductor, medicine, f...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 周国红王士维王利张海龙杨燕
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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