Compositions: ceramic – Ceramic compositions – Refractory
Patent
1996-11-08
1998-06-16
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
252514, 252521, 505236, 505238, 505239, C04B 3504, C22C 2912
Patent
active
057670293
ABSTRACT:
Metal-ceramic composite materials which combine advantageous properties of ceramic and metal and have the composition (Mg.sub.1-x Cu.sub.x)O+Ag.sub.y, where 0.03.ltoreq.x.ltoreq.0.25 and 0.001.ltoreq.y.ltoreq.0.5, can be produced in a one-stage process. In this process, sintering is carried out in air at a sintering temperature in the temperature range of 980.degree. C.-1100.degree. C. for a sintering time in the range of 1.5-2.5 hours. The rate of temperature rise from room temperature to the sintering temperature is in the range of 8-50 K/min. When 0.01.ltoreq.y.ltoreq.0.1, such composite materials are suitable as materials having high toughness for low-friction, self-lubricating sliding bearings, in particular of ceramic. When 0.1.ltoreq.y.ltoreq.0.2, they are suitable as electrical contact materials in fuel cells and for abrasion-resistant sliding contacts. When 0.15.ltoreq.y.ltoreq.0.5, the composite materials have a high conductivity.
REFERENCES:
patent: 5447908 (1995-09-01), Itozaki et al.
patent: 5512541 (1996-04-01), Konishi et al.
"A composition of the wettability of copper-copper oxide and silver-copper oxide on polycrystalline alumina", Meier, et al., Journal of Materials Science, 30, 1995, pp. 4781-4786. No Month.
ABB Research Ltd.
Group Karl
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