Abstract
FIELD: metallurgy.
SUBSTANCE: invention relates to powder metallurgy field. Particularly it relates to receiving of sintered hard alloy on the basis of tungsten carbide. It can be used for manufacturing of cutters, drills and milling cutter. Hard alloy contains 80.0-82.0 wt % tungsten carbide and 18.0-20.0 wt % of binding. Binding contains, wt %: molybdenum 48.0-50.0; niobium 1.0-2.0; rhenium 10.0-12.0; cobalt 36.0-41.0.
EFFECT: receiving of high-strength alloy.
Description
The invention relates to the field of powder metallurgy and for the production of sintered hard alloys based on tungsten carbide, which can be used for the manufacture of cutters, drills, mills and other tools.
Known sintered carbide based on tungsten carbide, containing 3.0 to 20.0 wt.% A binder alloy containing, wt.%: Cobalt 20.0-75.0; molybdenum – up to 5.0; niobium – up to 3.0 [1].
The objective of the invention is to increase the strength of the alloy.
The technical result is achieved in that in a sintered hard alloy based on tungsten carbide containing 80.0-82.0 wt.% Tungsten carbide and 18.0-20.0 wt.% Binder, the binder contains, wt.%: Molybdenum 48 0-50.0; niobium 1.0-2.0, rhenium 10.0-12.0; cobalt 36.0-41.0.
In the table. 1 shows the composition of the alloy, as well as the ultimate strength in bending. In the table. 2 shows the composition of the ligament.
Table 1 Components Composition, wt.%: one 2 3 Wolfram carbide 80.0 81.0 82.0 Bunch 20,0 19.0 18.0 Bending Strength, MPa ~ 1950 ~ 1950 ~ 1950
Table 2. Components Composition, wt.%: one 2 3 Molybdenum 48.0 49.0 50,0 Niobium 1,0 1,5 2.0 Rhenium 10.0 11.0 12.0 Cobalt 41.0 38.5 36.0
The powders of the alloy components are mixed in the indicated proportions, the mixture is pressed under pressure of 4.5-4.8 t / cm 2 and sintered in an electric furnace at a temperature of 1300-1330 ° C in vacuum for 7-9 hours. During sintering, the binder dissolves part of the tungsten carbide and melts. The result is a dense material whose structure consists of tungsten carbide particles connected by a binder.
Information sources
1. GB 1085041, C22C 29/06, 1967.
https://patents.google.com/patent/RU2351676C1/en?q=tungsten+carbide&oq=tungsten+carbide+
Post time: Jun-17-2022
