公开(公告)号：US3849865A

公开(公告)日：1974-11-26

申请号：US29815672

申请日：1972-10-16

申请人： NASA

发明人： GEDWILL M ,  GRISAFFE S

IPC分类号： C23C4/08 ,  C23C10/02 ,  C23C28/02 ,  C30B21/02 ,  B23P3/00 ,  B23P19/04

CPC分类号： C23C28/021 ,  C23C4/073 ,  C23C10/02 ,  C23C28/023 ,  C30B21/02 ,  Y10T29/49888 ,  Y10T428/1259

摘要： The surface of a metallic base system is initially coated with a metallic alloy layer that is ductile and oxidation resistant. An aluminide coating is then applied to the metallic alloy layer. The chemistry of the metallic alloy layer is such that the oxidation resistance of the subsequently aluminized outermost layer is not seriously degraded.

摘要翻译： 金属基体系的表面最初涂覆有延展性和抗氧化性的金属合金层。 然后将铝化物涂层施加到金属合金层。 金属合金层的化学性能使得随后镀铝的最外层的抗氧化性不会严重降低。

公开(公告)号：US3762884A

公开(公告)日：1973-10-02

申请号：US3762884D

申请日：1971-10-18

申请人： NASA

发明人： GRISAFFE S ,  KLECHKE E

IPC分类号： C23C4/18 ,  C23C10/02 ,  C23C10/50 ,  F01N13/16 ,  B32B15/00

CPC分类号： F01N13/16 ,  C23C4/18 ,  C23C10/02 ,  C23C10/50 ,  Y10S428/926 ,  Y10S428/937 ,  Y10S428/938 ,  Y10T428/12458 ,  Y10T428/12937

摘要： Low alloy austenitic stainless steel is protected from oxidative corrosion and erosion at high temperatures in the presence of exhaust gases from internal combustion engines by flame-spraying a layer between about 0.003 inches and about 0.007 inches thick of an alloy of 80 percent nickel and 20 percent chromium on the steel base, and thereafter converting the layer to an intermetallic chromium containing nickel aluminide coating by a low temperature aluminum cementation process. A cementation pack comprising 96 percent aluminum oxide, 2 percent aluminum, 1 percent sodium chloride, and 1 percent ammonium bifluoride is placed on the nickel-chromium layer in an inert atmosphere for a period between four hours and 24 hours at 1400*F to 1600*F to form an intermetallic chromium containing nickel aluminide coating containing 40 to 60 atomic percent aluminum. The coated steel is highly resistant to oxidation corrosion and erosion by high temperature exhaust gases from internal combustion engines. It is particularly useful in the construction of thermal reactors for exhaust systems in automobiles for the control of pollution from exhausts.