A. P. Petrov

Production of titanium carbide powder from titanium swarf

ConclusionsIt is demonstrated that titanium carbide powder can be obtained from titanium swarf. The following optimum parameters of carbidization in a vacuum corresponding to 0.013 Pa have been established: 1.5-h holding at a temperature of 1873°K; 0.5-h holding at 2273°K; 0.5-h comminution in a vibratory mill; and 0.5-h holding at 2273°K, The amount of oxygen in the titanium carbide powder produced was found to be less than that in the powder currently manufactured in the Soviet hard-metal industry.

Tungsten-free hard alloys based on titanium carbide

The properties of tungsten-free hard alloys based on titanium carbide prepared from chips of various titanium alloys were studied, and the conditions for the preparation of tungsten-free alloys were optimized. The properties of TiC-based alloys prepared from chips of the VT20, VT3-1, and VT25 titanium alloys, containing V, Mo, Zr, and Al, were shown to compare well with those of commercial analogs. Nickel vaporization during vacuum sintering of the hard alloys was studied, and the sintering conditions were optimized (residual pressure in the range 10–100 Pa, reduced sintering temperature)

Preparing hard-alloy mixtures in a magnetic induction rotor

The parameters have been optimized in welding titanium carbide powder for the preparation of TiC-Ni-Mo and WC-Co hard-alloy mixtures. The equipment enables one to accelerate the processing of the TiC-Ni-Mo hard-alloy mixtures to give a processing time of 1 hour subject to a given composition and average particle size of 0.8 μm. The major properties of specimens made from the mixtures are no worse than those of industrial analogs made by standard methods and in certain cases are better than them.

Preparation of titanium oxide powder of prescribed composition

A mathematical model is suggested for the process of titanium chip impregnation with oxygen. The model is based on the assumption that it is possible to ignore the effect of a thin surface oxide film on oxygen impregnation of α-Ti solid solution. The process of producing TiO powder with a particle size of less than 100 µm has been optimized for the minimum expenditure of energy.

Titanium carbide-based carbide steels made of chips of titanium alloys

Properties and microstructure of carbide steels produced on the basis of titanium carbide are studied. Powdered TiC was obtained from chip wastes of the titanium alloys VT1-0, VT20, VT3-1, VT25, VT5-1, and OT4-1 in three ways: nitridingcarbidizing, double carbidizing, and oxidizing-carbidizing. It has been determined that presence of nitrogen deteriorates the properties of carbide steels. The high values of strength and hardness obtained by oxidizing-carbidizing and double carbidizing of VT5-1 alloy chips testify to the advisability of using such chips for producing carbide steels.

Use of titanium alloy swarf for the production of TK type hard metals

Titanium alloy swarf has considerable potential as a raw material for the production of powders of titanium and its refractory compounds. This paper employs a trial batch (200 kg) of titanium carbide of nonstoichiometric composition made under industrial conditions for the production of TK grade hard metals. The compositions of VT-3-1 titanium alloy swarf and of titanium carbide, complex carbide and T5K10 alloy produced from it are presented. The results of metallographic analyses of the experimental batches of T5K10 alloy specimens are shown.

Properties of titanium carbide powders produced from titanium and titanium alloy swarf

A method has been developed for the production of TiC powder from titanium and titanium alloy swarf. The cost of this titanium carbide is reduced substantially by the low cost of the starting material, titanium swarf. Compared with the industrially produced material, titanium carbide prepared from the titanium alloy swarft in vacuum and argon contained less free carbon, more combined carbon, and approximately the same amounts of oxygen and nitrogen.

Carbidization of spherical titanium particles in a solid-liquid state

ConclusionsA mathematical model of the carbidization process of titanium in a solid-liquid state and optimum conditions of carbidization of titanium are proposed. Data yielded by model experiments are in qualitative agreement with results of calculations. An investigation, involving microhardness measurements on specimen sections, was carried out into the carbidization kinetics of spherical titanium specimens at temperatures of 2073–2573°K.