| 摘要 |
FIELD: powder metallurgy, namely production of article of super-hard materials on base of cubic boron nitride, possibly rough working and shock turning of chilled steels, rough working of cast irons, cutting tools, namely cutting inserts, milling cutters, drills. ^ SUBSTANCE: method comprises steps of activating and chemically copper plating powder of cubic boron nitride with fraction size no more than 10 micrometers; then mechanically mixing copper coated powder of cubic boron nitride and titanium powder with fraction size no more than 10 micrometers; subjecting prepared mixture to thermal vacuum treatment according to schedule: soaking at temperature 650 - 980°C and evacuation degree 1 x 10-5 - 5 x 10-5 Hg mm; soaking at 250 - 350°C and evacuation degree 300 -400 Hg mm; soaking at 700 - 900°C and evacuation degree 1 x 10 -5 - 5 x 10 -5 Hg mm; cooling mixture; increasing pressure till atmospheric one and mechanically mixing prepared mixture with aluminum powder. Prepared charge is placed in container and subjected to hot extrusion at 1100 - 1300°C and 3.5 -4.0 GPa for producing compacted product. Then temperature and pressure are lowered. In second variant of invention before thermal vacuum treatment one of alloys Mo -Al, V - Al, Ni - Al is introduced into mixture and hot extrusion is performed at 1100 - 1300°C or 5.0 - 5.5 GPa. ^ EFFECT: increased shock resistance, improved quality of cutting edge, enhanced cutting properties of tip. ^ 7 cl, 1 tbl, 4 ex
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