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Mo-corundum ceramic material and low-temperature sintering method

A ceramic material, low-temperature sintering technology, applied in the field of alumina ceramic materials, can solve the problems of high energy consumption at sintering temperature and high product cost, and achieve the effects of reducing sintering temperature, reducing high-temperature energy consumption, product cost, and simple process

Inactive Publication Date: 2009-08-26
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to use industrial raw materials, add molybdenum oxide, and use normal pressure low-temperature sintering technology to prepare high-strength alumina ceramics with a bending strength of 300-600 MPa, which can solve the above-mentioned problems of excessive sintering temperature, ultra-fine powder or Excessive energy consumption and high product cost caused by ion discharge sintering or hot isostatic pressing

Method used

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  • Mo-corundum ceramic material and low-temperature sintering method

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Experimental program
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Effect test

Embodiment 1

[0014] (1) The weight percentage of raw materials is: α-Al 2 o 3 Powder 92%, molybdenum oxide 1%, feldspar 1%, calcium carbonate 2%, clay 3% and talc 1%, ingredients according to the above ratio;

[0015] (2) Mix the above raw materials by ball milling for 3 hours and then dry them in the air at 100°C for 24 hours;

[0016] (3) Forming by cold isostatic pressing, holding pressure for 3 minutes under a pressure of 200 MPa;

[0017] (4) Sinter in a silicon molybdenum furnace at 1430° C. under normal pressure and keep warm for 2 hours.

[0018] The bending strength of the obtained product was 430MPa.

Embodiment 2

[0020] (1) The weight percentage of raw materials is: α-Al 2 o 3 Powder 95%, molybdenum oxide 0.5%, feldspar 1%, calcium carbonate 1%, clay 1.5% and talc 1%, ingredients according to the above ratio;

[0021] (2) Mix the above raw materials by ball milling for 3 hours and then dry them in the air at 100°C for 24 hours;

[0022] (3) cold isostatic pressing at 300MPa for 3 minutes;

[0023] (4) Sinter in a silicon molybdenum furnace at 1480° C. under normal pressure and keep warm for 2 hours.

[0024] The bending strength of the obtained product is 500MPa.

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Abstract

The invention discloses a molybdenum corundum ceramic material and a low-temperature sintering method. The molybdenum corundum ceramic material is made from the raw materials with the following weight percentage content of 85-99.5 percent of alumina powder, 0.1-3.0 percent of molybdenum oxide, 0.1-14.5 percent of clay, 0.1-14.5 percent of feldspar, 0.1-14.5 percent of calcium carbonate and 0.1-14.5 percent of talc. The steps include: milling the raw materials for three hours and drying the materials at 100 DEG C for 24h in the air; adopting the cold isostatic pressing forming and keeping the pressure under 200-300MPa for three minutes; keeping the milled materials at the temperature of 1350-1550 DEG C for 0.5-3h in a si-mo furnace, sintering and cooling the materials with the furnace to obtain the molybdenum corundum ceramic material. The invention adopts general industrial equipment and the process is simple, which is beneficial to the industrialized production of the corundum ceramics. The sintering temperature of the alumina ceramics is obviously lowered, the bending strength can reach to 350-600MPa, the high temperature energy consumption and the product cost of rich aluminum ceramics can be obviously lowered, and alumina ceramics with high strength are obtained at the same time.

Description

technical field [0001] The invention belongs to the technical field of alumina ceramic materials, in particular to a corundum ceramic material added with molybdenum oxide and a low-temperature sintering method thereof. Background technique [0002] Alumina ceramics, also known as corundum porcelain, have excellent mechanical properties, electrical properties, thermal properties, high diffuse reflectivity, corrosion resistance, rich and low-cost raw materials, and better than MgO, SiC, Si 3 N 4 The easier sintering of ceramics is the basic material used to manufacture a variety of high-strength, wear-resistant, high-temperature-resistant ceramic components, and the demand is huge, so it has attracted much attention at home and abroad. In the fields of modern industry and modern science and technology It is more and more widely used in ceramics, and it is the most widely used special ceramic at present. Its application fields involve metallurgy, chemical industry, electromech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/64
Inventor 杨淑金吴伯麟张楠
Owner GUILIN UNIVERSITY OF TECHNOLOGY