Machine component of oxide ceramic material

Details Machine component of oxide ceramic material Machine component of oxide ceramic material

1981-07-01

1983-12-13

Chambers, A. Michael

Valves and valve actuation

Valve

Materials

13762541, F16K 1100

Patent

active

044201427

ABSTRACT:
A machine component is disclosed composed of 3.0 to 25 weight percent of zirconium oxide and/or hafnium oxide which are present in the interior of the machine component at room temperature predominantly in the metastable tetragonal modification and at the surface of the machine component in the monoclinic modification, said machine component having a profile bearing ratio of about 10 to 40% and an center line average surface roughness R.sub.a in the contact area of less than 0.3 .mu.m. The machine components of the present invention are leakproof, exhibit good thermal shock durability and exhibit good frictional engagement characteristics for long periods of time.

REFERENCES:
patent: 2246078 (1941-06-01), Rohn et al.
patent: 3463192 (1969-08-01), Herion, Jr.
patent: 3921659 (1975-11-01), Rudewick
patent: 4292997 (1981-10-01), Bernat
Hove and Riley, Modern Ceramics, John Wiley and Sons, Inc., 1965, pp. 357-358.
Ryshkewitch; Eugene, Oxide Ceramics, Academic Press, 1960, pp. 350, 351, 369-370, 388-391.

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