Preparation and mechanical properties of alumina/spinel/ metal composite with three different sintering methods
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Alumina-spinel(NiAl2O4, CoAl2O4 solid solution)-metal(nickel, cobalt solid solution) composites were fabricated by partialreduction of spinel in carbon-bed and sintered with three different processes namely, pressureless, hot pressing, and sparkplasma sintering (SPS). The microstructural features and mechanical properties of composites were investigated. Thepressureless samples, SPS samples, and hot pressed samples reached > 91%, > 97% and > 98% theoretical density,respectively. The flexural strength of SPS, hot pressed, and pressureless samples were about 415 MPa, 367 MPa, and 247 MPa,respectively. Vickers Microhardness of SPS, hot pressed, and pressureless sintering were about 15.3, 14.5, and 10.98 GPa,respectively. The fracture toughness of SPS and hot pressed samples did not have a significant difference, and they were about7.2 and 7.8 MPa.m1/2, repectively
Abstract
Alumina-spinel(NiAl2O4, CoAl2O4 solid solution)-metal(nickel, cobalt solid solution) composites were fabricated by partialreduction of spinel in carbon-bed and sintered with three different processes namely, pressureless, hot pressing, and sparkplasma sintering (SPS). The microstructural features and mechanical properties of composites were investigated. Thepressureless samples, SPS samples, and hot pressed samples reached > 91%, > 97% and > 98% theoretical density,respectively. The flexural strength of SPS, hot pressed, and pressureless samples were about 415 MPa, 367 MPa, and 247 MPa,respectively. Vickers Microhardness of SPS, hot pressed, and pressureless sintering were about 15.3, 14.5, and 10.98 GPa,respectively. The fracture toughness of SPS and hot pressed samples did not have a significant difference, and they were about7.2 and 7.8 MPa.m1/2, repectively
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