EP 0387237 A3 19910123 - PROCESS FOR MAKING OBJECTS, TOOLS AND PARTS BY POWDER METALLURGY
Title (en)
PROCESS FOR MAKING OBJECTS, TOOLS AND PARTS BY POWDER METALLURGY
Publication
Application
Priority
AT 49189 A 19890306
Abstract (en)
[origin: EP0387237A2] In a process for making workpieces, in particular tools, with refractory carbides and/or carbonitrides homogeneously distributed in a matrix by powder metallurgy, a content of the elements of group or subgroup IV and V of the periodic table of at least 3 % by weight and a low concentration of carbon and nitrogen is set in a melt and primary precipitations are prevented, and a desired content of carbon and/or nitrogen is produced by atomisation of the melt to form powder and/or diffusion-annealing of the powder with a medium containing carbon or carbon compounds and/or nitrogen or nitrogen compounds, and powders containing at least 10 % by volume of a carbide and/or carbonitride fraction are processed, if desired after mixing with a further powder, in a manner known per se to give a powder metallurgical component. Workpieces, in particular tools, made by this process have a content of the elements vanadium and niobium and/or titanium and/or zirconium and/or hafnium and/or tantalum with a fraction of carbide and/or carbonitride of at least 10 % by volume at a maximum grain size of the carbide and/or carbonitride of 5 mu m.
IPC 1-7
IPC 8 full level
B22F 1/00 (2006.01); B22F 1/145 (2022.01); B22F 9/02 (2006.01); B22F 9/08 (2006.01); C22C 1/05 (2006.01); C23C 8/32 (2006.01)
CPC (source: EP KR US)
B22F 1/145 (2022.01 - EP KR US); C22C 1/04 (2013.01 - KR); C23C 8/32 (2013.01 - EP US); Y10T 428/12056 (2015.01 - EP US); Y10T 428/12576 (2015.01 - EP US)
Citation (search report)
- [A] EP 0156760 A2 19851002 - MANNESMANN AG [DE]
- [A] GB 2048955 A 19801217 - ATOMIC ENERGY AUTHORITY UK
- [A] PATENT ABSTRACTS OF JAPAN, Band 13, Nr. 190 (C-593)[3538], 8. Mai 1989; & JP-A-01 015 344 (MITSUBISHI METAL CORP.) (19-01-1989)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
EP 0387237 A2 19900912; EP 0387237 A3 19910123; AT 392929 B 19910710; AT A49189 A 19901215; JP H02282436 A 19901120; KR 900014613 A 19901024; US 5034282 A 19910723
DOCDB simple family (application)
EP 90890046 A 19900222; AT 49189 A 19890306; JP 4740090 A 19900301; KR 900002885 A 19900303; US 48704890 A 19900305