Available NEW Materials

NEW Materials Available

VERY HIGH STRENGTH ALUMINA PROCESSING TECHNIQUE. This technique fabricates high strength aluminum oxide material. The procedure incorporates a combination of traditional processing techniques, including vacuum hot pressing and hot isostatic pressing. Using these techniques in combination with the appropriate time, temperature, and pressure, eliminates the need for including any additives to achieve near theoretical density.

Advantages: Several methods exist for the formation of alumina parts. Generally, aluminum oxide (Al2O3) powder is processed with other materials. Most Al2O3 that is commercially available, is also processed with an additional sintering aid, such as MgO, to control the microstructure. Typically, there is a significant concentration of glassy phase on the grain boundaries. With this technology, high purity Al2O3 is fabricated with a controlled microstructure, without the aid of any additional second phases, yielding tougher grain boundaries and exceptional compressive and flexure strengths. Best of all, the resulting material has a density better than 99.6% of theoretical.

Properties: *Compressive Fracture Strength: 5.5GPa @ 10-4sec-1 to 8.3GPa @ 103sec-1 *Flexure Strength: >900MPa *Fracture Toughness (CTT): KIC ? 4.5MPa/m? *Young's Modulus: 414GPa *Density: 3.974g/cc (>99.6% Theoretical) *Mean Grain Size: 1.48?m *Equiaxed Grains (Form Factor = 0.86 out of 1.0)

Uses: The very high compressive strength would lend itself to applications requiring high strength and high temperature. Some potential applications would be: *ceramic cutting tools *thermoelectric modules *ceramic pistons *bioceramics *armor *engine components *capacitors *microwave transmission *tiles *abrasive tools.

Covered by two issued US patents. Available for license. #0315A.

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Page last updated 2/2/98