Multiple-layer wall for a hollow body and method for manufacturing same
First Claim
1. A casing subjected to hot gases such as combustion gases of an engine and comprising a hollow body including a three-layer composite wall having a load side, said wall including a ceramic inner layer bounding said load side and an outer retaining layer of fiber-reinforced material or metal confining said inner layer, and further comprising an intermediate layer of thermally insulating ceramic material between said inner and retaining layers, said intermediate layer being shrinkfitted or sintered on to the inner layer, said retaining layer compressively prestressing said inner layer.
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Abstract
A multiple-layer wall is provided for a hollow body to sustain high thermal and mechanical loads and to afford adequate thermal insulation. The wall has, on the inside, a heat and/or wear resistant ceramic inner layer and, surrounding it, a preferably prestressed retaining layer of fiber reinforced plastic. An intermediate layer of a thermally insulating ceramic material can also be provided. The wall can also have a retaining layer of metal. At least the retaining layer is shrink-fitted. The retaining layer of metal and/or the intermediate layer moreover can be deposited by a sintering process. Prestressing is achieved also by the shrinkage resulting from the sintering process. As a result of prestressing, the inner layer, when under internal pressure, comes under substantially no circumferential tension or under circumferential compression only. The wall is used especially with precombustion chambers of Diesel engines or with cylinder barrels or internal combustion engines.
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Citations
15 Claims
- 1. A casing subjected to hot gases such as combustion gases of an engine and comprising a hollow body including a three-layer composite wall having a load side, said wall including a ceramic inner layer bounding said load side and an outer retaining layer of fiber-reinforced material or metal confining said inner layer, and further comprising an intermediate layer of thermally insulating ceramic material between said inner and retaining layers, said intermediate layer being shrinkfitted or sintered on to the inner layer, said retaining layer compressively prestressing said inner layer.
Specification