Oxide laminated composites with aluminum phosphate (AlPO4) and alumina platelets as crack deflecting materials
✍ Scribed by Dong-Kyu Kim; Waltraud M. Kriven
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 358 KB
- Volume
- 37
- Category
- Article
- ISSN
- 1359-8368
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✦ Synopsis
Oxide-oxide laminated composites with aluminum phosphate (AlPO 4 ) and alumina platelets as crack deflecting interphases were developed by the tape casting method. Dense bodies of Al 2 O 3 , mullite, 50 vol% Al 2 O 3 $50 vol% YAG in situ composite, and 3Y-TZP were sintered and characterized. Tape casting formulations for different oxides with solid contents of 25.1 and 30 vol%, respectively, were developed. XRD indicated compatibility between alumina, mullite, zirconia and AlPO 4 . Laminated, matrix-interphase composite systems consisting of Al 2 O 3 -AlPO 4 , mullite-AlPO 4 , 50 vol% Al 2 O 3 $50 vol% YAG in situ composite-AlPO 4 , and 50 vol% Al 2 O 3 $50 vol% YAG in situ composite-alumina platelets were made. The 50 vol% Al 2 O 3 $50 vol% YAG in situ matrix-alumina platelet composite showed 'quasi-elastic' load-displacement behavior under the conditions of fabrication, and had a 3-point bending strength and work of fracture of 188G8 MPa and 0.65G0.02 kJ/m 2 , respectively. The 3Y-TZP-AlPO 4 laminated composite could not be made because of delamination due to thermal expansion mismatch.