| Patent Number |
Title Of Patent |
Date Issued |
| 5032215 |
Method of etching ceramic frictional or sealing elements |
July 16, 1991 |
| Combinations of frictional and sealing elements made from hard substances, such as sintered aluminum oxide, are ground and lapped at their surfaces of engagement. At least one surface has at least some micro-blurred areas. The micro-blurring is produced by chemical etching. Phosphoric ac |
| 4840154 |
Tubular ceramic body for gas passages in cylinder head of internal combustion engine |
June 20, 1989 |
| A tubular ceramic body for gas passages in a cylinder head of an internal combustion engine comprises a tubular piece having an opening, two separate tubular portions each having an end side and provided with an opening at the end side, the tubular portions merging into the tubular p |
| 4716869 |
Valve guide for an internal combustion engine |
January 5, 1988 |
| A tubularly formed valve guide (1) with a bore for a metal valve shank (2) for use in an internal combustion engine comprising a sintered body of a partially stabilized zirconium oxide having a porosity of less than 3%. Even under extreme stress, e.g., in an outlet valve of a high-power |
| 4643144 |
Operating element for operating the valves of an internal combustion engine |
February 17, 1987 |
| An operating element for the operation of the valves of an internal combustion engine consists of metal and has on its working surface engaged with the cam of a camshaft an insert (2) of ceramic material which is fastened on the operating element (1) with an oil- and heat-resistant, |
| 4535683 |
Piston with a member made of partially stabilized zirconium oxide |
August 20, 1985 |
| A piston arrangement with a metal shaft, a piston head that is attached to it with a shrink ring, and a member made of partially stabilized zirconium ozide. The top which demarcates the combustion chamber, of the piston head, consists entirely of the member made of partially stabilized |
| 4526824 |
Thermal insulation lining of ceramic material for a hot gas duct enveloped in metal |
July 2, 1985 |
| A thermal insulation lining (1) in the exhaust duct (4) of a cylinder head (5) consists of a sintered compact (2) of ceramic material having an envelope containing or consisting of inorganic fibers. |
| 4524732 |
Cylinder head of a piston engine |
June 25, 1985 |
| In a cylinder head (1) of a piston engine, a thermal insulation component having openings for the accommodation of valve seats, spark plugs, and injection nozzles consists of a circular aluminum titanate plate (2) which is shrink-fitted into a planar circular ring of zirconium oxide (12) |
| 4522415 |
Piston ring for an internal combustion engine |
June 11, 1985 |
| A piston ring (1) made of ceramic materials for an internal combustion engine comprising a body made by sintering of partially stabilized zirconium oxide (PSZ) which has a porosity <3% and, rolling surface (4) of the piston ring having a centerline average roughness R.sub.a of 0.03 to |
| 4522171 |
Pre-combustion or turbulence chamber for internal combustion engines |
June 11, 1985 |
| In a pre-combustion or turbulence chamber for an internal combustion engine, an inner molded body, defining an inner chamber, is formed of a material having a thermal conductivity of at least 12 W/(m.multidot.K). An outer body is secured to the outer surface of the inner body by shrinkin |
| 4519359 |
Mullite plate |
May 28, 1985 |
| In a cylinder head of a piston engine, the surface of the cylinder head facing the combustion chamber is covered by a plate having openings for valves, spark plugs or injection nozzles. The plate consists of mullite containing 2 to 30% by volume of zirconium oxide and/or hafnium oxide |
| 4420142 |
Machine component of oxide ceramic material |
December 13, 1983 |
| 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 |
