Process and apparatus for surface hardening of refractory...

B - Operations – Transporting – 05 – D

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B05D 1/24 (2006.01) B05C 19/02 (2006.01) C23C 8/10 (2006.01) C23C 8/24 (2006.01) C23C 8/28 (2006.01)

Patent

CA 2117069

A process and apparatus for forming a hardened outer shell (40) on a refractory metal workpiece (36) preferably heated in a fluidized bed of metallic oxide particles (38) in an environment of an inert gas and a reactive gas with the reactive gas either oxygen or nitrogen. The workpieces (36) are heated in the fluidized bed to a temperature between 800 °F and 1,600 °F for a period of over two hours to form hardened outer shell (40) in wo layers (42, 44). Outer layer (42) is an oxide or nitride layer having a thickness (T1) between microns and 25 microns. Inner layer (44) is a case hardened layer of the refractory metal having a thickness (T2) between 25 microns and 75 microns. In one embodiment (Figure 3) workpieces (56) may be cold worked by peening from finely divided metal oxide particles (54) to provide a uniform surface texture for subsequent hardening.

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