PRODUCTION OF W-NI-FE SINTERED ALLOY

• Main Authors: HOSOMI YASUSHI, AMANO YOSHINARI, OSADA MITSUO
• Format: Patent
• Language: English
• Published: 23.01.1984
• Subjects: ALLOYS; CASTING; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

PURPOSE:To obtain a titled sintered alloy having high tensile strength and hardness and substantial ductility, by roasting a powder mixture consisting essentially of W and contg. Ni, Fe in an oxidative atmosphere then reducing the same to regulate the contents of C and O, forming the same to a pressed body, and sintering the pressed body at the liquid phase temp. or above thereby regulating the grain sizes of W in a specific range. CONSTITUTION:The powder mixture consisting of 85-98wt% W, and consisting of the balance Ni and Fe, and having a uniform weight ratio between Ni and Fe at 5:5-8:2 is roasted in an oxidative atmosphere of 400-800 deg.C and the C contd. in the raw materials and mixture is removed by oxdation. The roasted powder is reduced in a reducing atmosphere of 400-800 deg.C, is packed in a rubber bag, and is compressed with a hydrostatic press, whereby a pressed body is obtd. The pressed body is worked to a prescribed size and the worked body is heated in a reducing atmosphere, more particularly in an H2 atmosphere to the temp. highly by 20-60 deg.C than the liquid phase to sinter the W to 20-100mum grain sizes, whereby the intended W-Ni-Fe sintered alloy is obtd.