Fabrication of transparent spinel polycrystalline materials
Book
·
OSTI ID:442807
- Tohoku Univ., Sendai (Japan)
- Mitsubishi Materials Corp., Omiya (Japan)
The novel polycrystalline material of spinel-alumina solid solution, MgO{center_dot}nAl{sub 2}O{sub 3} (1 {le} n < 3):(Mg{sub x}Al{sub (2{minus}2x)/3})Al{sub 2}O{sub 4}(0.4 < x {le} 1.0), was fabricated by reaction sintering using commercial spinel, magnesia and alumina powders as starting material. The mixed powders of (magnesia + alumina) or (spinel + alumina) with above chemical composition were sintered at 1,450--1,550 C in air, followed by post-HIPing at 1,600--1,800 C and 150 MPa in Ar gas atmosphere. The resulting polycrystalline materials showed superior properties such as about 90% in-line optical transmittance at 300--5,000 nm, 250 MPa in fracture strength and 2.8 MPam{sup 1/2} in fracture toughness.
- OSTI ID:
- 442807
- Report Number(s):
- CONF-960515--; ISBN 0-87170-568-0
- Country of Publication:
- United States
- Language:
- English
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