| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3ab0afa8ec7188840f4c6620c83142f0 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C8-24
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C21D1-53
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C8-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C8-28
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C21D1-62 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C21D1-53
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C14-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C21D1-62
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C8-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C8-28
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C8-24 |
| filingDate |
1993-11-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1995-03-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_dcfabfa6fff898a30e32f7e64ab0c058 |
| publicationDate |
1995-03-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-5399207-A |
| titleOfInvention |
Process for surface hardening of refractory metal workpieces |
| abstract |
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 1600° F. for a period of over two hours to form hardened outer shell (40) in two layers (42, 44). Outer layer (42) is an oxide or nitride layer having a thickness (T1) between 10 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 (FIG. 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. |
| isCitedBy |
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| priorityDate |
1990-01-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |