Composite thermal shield for engine components

Stock material or miscellaneous articles – All metal or with adjacent metals – Embodying fibers interengaged or between layers

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Details

428614, 123193P, 164 98, B32B 1514, B22D 1900, F02F 302

Patent

active

045460485

ABSTRACT:
A composite thermal shield includes an external solid layer of heat and corrosion-resistant metal bonded to a permeable layer of metal. The composite is mechanically affixed to the substrate metal of an engine component, by a method wherein the substrate metal becomes entrained within the interstices of the permeable metal layer. In a first preferred form the permeable metal layer is comprised of a fibrous stainless steel woven wire mesh which is sintered or brazed to the external stainless steel heat and corrosion-resistant layer. In a preferred process, an aluminum substrate piston is formed to include the composite shield, whereby the aluminum is pressed into the permeable layer during formation of the piston in a mold. In a second preferred form, the piston includes an insulation layer wherein two layers of stainless steel wire mesh have an intermediate stainless steel layer sandwiched between them. The bottom layer of wire mesh is subjected to the afore-described mechanical bonding with the substrate aluminum, while the upper layer, positioned between the top and intermediate stainless steel layers, operates purely as an insulation layer.

REFERENCES:
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patent: 4142022 (1979-02-01), Erickson et al.
patent: 4245611 (1981-01-01), Mitchell et al.
patent: 4254621 (1981-03-01), Nagumo
patent: 4273824 (1981-06-01), McComas et al.
patent: 4318438 (1982-03-01), Ban et al.
patent: 4334507 (1982-06-01), Kohnert et al.
patent: 4338380 (1982-07-01), Erickson et al.
patent: 4404262 (1983-09-01), Watmough

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