Global Patent Index - EP 1172455 A3

EP 1172455 A3 20031105 - Method of surface treatment of titanium metal

Title (en)

Method of surface treatment of titanium metal

Title (de)

Oberflächenbehandlungsverfahren von Titan

Title (fr)

Procédé de traitement de surface de titane

Publication

EP 1172455 A3 20031105 (EN)

Application

EP 01117022 A 20010712

Priority

JP 2000211518 A 20000712

Abstract (en)

[origin: EP1172455A2] A method of carburizing treatment is proposed in which if carburizing is carried out at a low temperature, carbon will not turn amorphose and deposit on the surface of a titanium metal but reliably penetrate into between metallic atoms. It is a method of surface treatment of a titanium metal comprising the steps of heating the titanium metal to a temperature of 400-690 DEG C in a cleaning gas atmosphere containing hydrogen gas, subjecting the surface of the titanium metal to cleaning by applying a DC voltage of 200-1500 V, and plasma carburizing in an atmosphere comprising a carburizing gas having the molar ratio of hydrogen atoms (H) to carbon atoms (C) adjusted to (H/C) </= 9 at a pressure of 13-400 Pa and a temperature of 400-690 DEG C . Ionization reaction in the gas is suppressed suitably. Because there exists no excessive carbon which is not used for carburization but turns soot or glass-like carbon, in the atmosphere during carburization, carburizing reaction progresses smoothly.

IPC 1-7

C23C 8/36

IPC 8 full level

C23C 8/36 (2006.01)

CPC (source: EP US)

C23C 8/36 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family (publication)

EP 1172455 A2 20020116; EP 1172455 A3 20031105; US 2002020476 A1 20020221

DOCDB simple family (application)

EP 01117022 A 20010712; US 90226001 A 20010711