Wrappable multi-layer heat shield
AssigneeFederal-Mogul Powertrain LLC
InventorsZhong Huai Zhang, Tianqi Gao, Linwood Ludy, Daniel Rowcotsky, Wai Kit Ho
Life of this patent
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Abstract
A flexible, wrappable multilayered heat shield is provided. The heat shield includes a reflective metal outermost layer, an innermost layer of high temperature yarn capable of withstanding temperatures up to about 650 degrees ° C. continuously, and about 750° C. intermittently, and an intermediate layer of nonwoven material capable of withstanding temperatures up to about 550° C. continuously sandwiched between the outermost and innermost layers.
Claims9
A protective heat shield having a multilayered wrappable wall, comprising:
- a reflective radially outermost layer;
- a radially innermost tri-layer knit fabric including a knit innermost layer and a knit outer layer fixed to one another via a knit middle layer, said tri-layer knit fabric including high temperature yarn able to withstand temperatures above about 650 degrees Centigrade;
- an intermediate layer of non-woven material of intertwined fibers defining micro-pores, said intermediate layer being formed as a separate layer from said innermost tri-layer knit fabric and being subsequently fixed in sandwiched relation between, and in direct contact with, said outermost layer and said innermost tri-layer knit fabric;
- and
- wherein said knit high temperature yarn are selected from the group consisting of basalt, silica, ceramic, and stainless steel.
A protective heat shield having a multilayered wrappable wall, comprising:
- a reflective radially outermost layer;
- a radially innermost tri-layer knit fabric including a knit innermost layer and a knit outer layer fixed to one another via a knit middle layer, said tri-layer knit fabric including high temperature yarn able to withstand temperatures above about 650 degrees Centigrade;
- and
- an intermediate layer of non-woven material of intertwined fibers defining micro-pores, said intermediate layer being formed as a separate layer from said innermost tri-layer knit fabric and being subsequently fixed in sandwiched relation between, and in direct contact with, said outermost layer and said innermost tri-layer knit fabric;
- wherein said intermediate layer is formed of high temperature fibers able to withstand temperatures above about 550 degrees Centigrade and wherein said high temperature fibers are glass fibers bonded together.
A protective exhaust system heat shield having a multilayered wrappable wall, comprising:
- a reflective radially outermost layer of impervious metal foil;
- a radially innermost tri-layer knit fabric including a knit innermost layer and a knit outer layer fixed to one another via a knit middle layer, said tri-layer knit fabric including high temperature yarn able to withstand temperatures above about 650 degrees Centigrade selected from the group consisting of basalt, silica, ceramic, and stainless steel;
- and
- an intermediate layer of high temperature non-woven material formed as a separate layer from said innermost tri-layer knit fabric and being subsequently fixed in sandwiched relation between, and in direct contact with, said outermost layer of impervious foil and said innermost tri-layer knit fabric.
Dependencies are inferred from the claim text.