Walbar Inc.

Walbar Metals, Inc.

Other

Bernard R Rose

John K Willis

Patrick R Lavery

Janos Beny

Daniel H Meggs

Process for producing novel nickel superalloy bodies having increased resistance of to oxidation and corrosion at high temperatures. The process comprises applying a thin layer of a platinum-group metal and heating to an elevated temperature to diffuse or integrate the platinum-group metal into the surface of the metal superalloy. Then the superalloy body is packed into a container filled with a diffusion powder composition containing sources of aluminum and chromium metals and heated in a hydrogen gas atmosphere to an elevated temperature to codeposit and diffuse aluminum and chromium into the platinum-group metal-treated surface. Finally, the superalloy body is removed from the diffusion coating container and heated to the solvus temperature to form a ductile surface having an outer zone microstructure comprising a normally brittle PtAl.sub.2 which has been ductilized by the solutioning therein of beta chromium. This ductilized PtAl.sub.2 may or may not be in a beta phase nickel aluminide matrix depending on substrate composition.

Diffusion coating products

Coated nickel, cobalt or nickel-cobalt superalloy bodies having increased resistance to oxidation, corrosion and thermal fatigue at high temperature are produced by applying a thin layer of a platinum-group metal, siliciding and heating to an elevated temperature to diffuse and integrate the silicided platinum-group metal into the surface of the superalloy body. Then the superalloy body is exposed to a diffusion powder composition containing sources of aluminum or aluminum/chromium metals and heated in a hydrogen or inert gas atmosphere to an elevated temperature to codeposit and diffuse aluminum or aluminum and chromium into the silicided platinum-group metal-treated surface layer. Finally, the superalloy body is heated to its solvus temperature to form a ductile protective surface layer having an outer zone comprising a platinum-group metal aluminide, ductilized by the solutioning therein of beta chromium, and an inner stabilizing zone of silicided platinum group metal comprising from 3% to 20% by weight of silicon.

Platinum group silicide modified aluminide coated metal superalloy body

Process for producing novel coated nickel and/or cobalt superalloy bodies having increased resistance to oxidation, corrosion and thermal fatigue at high temperatures. The process comprises applying a thin layer of a platinum-group metal, siliciding and heating to an elevated temperature to diffuse and integrate the silicided platinum-group metal into the surface of the superalloy body. Then the superalloy body is exposed to a diffusion powder composition containing sources of aluminum or aluminum/chromium metals and heated in a hydrogen or inert gas atmosphere to an elevated temperature to codeposit and diffuse aluminum or aluminum and chromium into the silicided platinum-group metal-treated surface. Finally, the superalloy body is heated to its solvus temperature to form a ductile surface having an outer zone comprising a platinum-group metal aluminide, optionally ductilized by the solutioning therein of beta chromium. An inner stabilizing zone of silicon-rich phases is formed during said diffusion processes.

Platinum group silicide modified aluminide coating process and products

Diffusion coating process

Improved powder-type diffusion-coating compositions for use in codeposition processes involving the formation of diffusion coating of chromium and aluminum on high nickel and high cobalt alloys known as superalloys. The compositions are characterized by easy flowability and, particularly, by the use of the intermetallic compound Co.sub.2 Al.sub.9.

Diffusion coating composition of improved flowability

Apparatus for simulating an open fire having a lamp mounted on a base structure within a shell. The shell is simulative of a pile of burning logs or the like and is at least in part light transmitting. Light masks are included, one of which operates to project the image of a flame on a projection screen mounted at the rear of the apparatus base. Arrangements may also be included for varying the light pattern projected from the lamp, for simulating the heat of a fire and for simulating the burning noise of a fire.

Growing community of inventors

Gloucester, MA, United States of America

Bernard R Rose