期刊
CERAMICS INTERNATIONAL
卷 44, 期 1, 页码 57-64出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.09.062
关键词
Infiltration sintering; Spark plasma sintering; Al2O3/Cu composite materials; Properties
资金
- Key Research and Development Projects of Shaanxi Province [2017ZDXM-GY-050]
- Electrical Materials and Infiltration Key Laboratory of Shaanxi Province Projects
- UK Newton Mobility Grant through Royal Society [IE161019]
- National Natural Science Foundation of China
- Royal academy of Engineering UK-Research Exchange with China and India
Al2O3/Cu (with 30 wt% of Cu) composites were prepared using a combined liquid infiltration and spark plasma sintering (SPS) method using pre-processed composite powders. Crystalline structures, morphology and physical/mechanical properties of the sintered composites were studied and compared with those obtained from similar composites prepared using a standard liquid infiltration process without any external pressure. Results showed that densities of the Al2O3/Cu composites prepared without applying pressure were quite low. Whereas the composites sintered using the SPS (with a high pressure during sintering in 10 min) showed dense structures, and Cu phases were homogenously infiltrated and dispersed with a network from inside the Al2O3 skeleton structures. Fracture toughness of Al2O3/Cu composites prepared without using external pressure (with a sintering time of 1.5 h) was 4.2 MPa m(1/2), whereas that using the SPS process was 6.5 MPa m(1/2). These toughness readings were increased by 18% and 82%, respectively, compared with that of pure alumina. Hardness, density and electrical resistivity of the samples prepared without pressure were 693 HV, 82.5% and 0.01 Omega m, whereas those using the SPS process were 842 HV, 99.1%, 0.002 Omega m, respectively. The enhancement in these properties using the SPS process are mainly due to the efficient pressurized infiltration of Cu phases into the network of Al2O3 skeleton structures, and also due to high intensity discharge plasma which produces fully densified composites in a short time.
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