Method for lowering oxygen content of titanium carbide and titanium nitride powder
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A powder oxygen content and titanium nitride technology, which is applied in the field of titanium carbonitride-based cermet preparation, can solve problems such as powder sintering, achieve low heating temperature, significant oxygen removal effect, and low cost
Inactive Publication Date: 2010-07-07
CHINA THREE GORGES UNIV
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Problems solved by technology
In this temperature range, for Ti(C,N)-based cermet raw material powder, only the oxygen adsorbed on the surface and oxygen in surface oxides such as nickel and cobalt can be removed; while for the hard phase powder titanium carbide TiC and nitride Titanium dioxide TiO formed on the surface of titanium TiN 2 Oxides that are more difficult to reduce have no effect
If the reduction temperature is raised above 1100°C, although oxygen can be removed, the powder will sinter to a certain extent at such a high temperature
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Embodiment 1
[0018] Put solid titanium carbide TiC 100ml powder in 100~1000ml chloroform CHCl 3 In the liquid, the water bath is heated to 35-61.7°C, and the reaction time is 1.5 hours. When no bubbles are formed in the liquid, the reaction is over. After the treated material is rinsed with absolute ethanol and filtered, the solid powder is vacuum-dried at 150°C. , to obtain the treated titanium carbide TiC powder.
Embodiment 2
[0020] Put solid titanium nitride TiN100ml powder in 100~1000ml chloroform CHCl 3 In the liquid, the water bath is heated to 40-60°C, and the reaction time is 1.5 hours. When no bubbles are formed in the liquid, the reaction is over. After the treated material is washed and filtered with absolute ethanol, the solid powder is vacuumed at 150°C. Dry to obtain treated titanium nitride powder.
Embodiment 3
[0022] 370 grams of titanium carbide TiC powders, 100 grams of titanium nitride TiN powders, 112.9 grams of molybdenum Mo powders, 50 grams of tungsten carbide WC powders, 360 grams of nickel Ni powders, 22.1 Gram graphite powder C is prepared into a mixture, and the traditional cermet preparation process is used to prepare Ti(C,N)-based cermet through processes such as ball milling, mixing, drying, pressing, and sintering.
[0023] Use an electron probe to measure the oxygen content in Ti(C,N)-based cermet body, the measurement area is 1130×1130μm 2 . Table 2 is the measurement results. After the titanium carbide TiC and titanium nitride TiN in the raw material powder were treated with chloroform, the oxygen content in the prepared Ti(C,N)-based cermet decreased by an order of magnitude.
[0024] Table 2 Without and with CHCl 3 Oxygen content of Ti(C,N)-based cermets prepared from treated TiC and TiN powders
[0025]
[0026] The flexural strength of Ti(C,N)-based cerm...
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Abstract
The invention discloses a method for lowering oxygen content of titanium carbide and titanium nitride powder. Solid titanium carbide powder and solid titanium nitride powder are respectively put in chloroform liquid; the volume ratio of two kinds of solid powder to chloroform liquid is 1:1-10; titanium carbide processing temperature is 35-61.7 DEG C, and titanium nitride processing temperature is 40-60 DEG C; the processing process ends when no bubbles are generated. The invention uses a chloroform chemical method to remove a TiO2 oxidation film on the surface of titanium carbide powder and titanium nitride powder particles so as to lower oxygen content of the powder, thus solving the problems of high porosity and low mechanical property of prepared titanium diboride base metal ceramic due to oxidization in the storage and transportation process of powder. TiC and TiN powder processed with the method of the invention are used for preparing titanium diboride base metal ceramics to eliminate sintering flaws, obviously decrease hard phase size, brings obviously even microscopic structure and obviously improves bending strength.
Description
technical field [0001] The invention belongs to the field of preparation of titanium carbonitride-based cermets, in particular to a method for reducing the oxygen content of titanium carbide and titanium nitride powders used for titanium carbonitride-based cermets. Background technique [0002] Titanium carbonitride (Ti(C,N))-based cermet is a typical multiphase composite material of metal binder phase toughened ceramic hard phase, which has high red hardness, wear resistance and heat resistance. , Anti-crater wear ability and low friction coefficient against steel, the tool products have a longer life. The preparation of titanium carbonitride-based cermets generally adopts powder metallurgy method, and the raw materials are mainly titanium carbide TiC, titanium nitride TiN, titanium carbonitride Ti(C, N), tungsten carbide WC, carbide Molybdenum Mo 2 C, nickel Ni, cobalt Co and other powders. These raw material powders will absorb oxygen in the environment during the plac...
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