Study On Preparation Of Titanium-aluminum Based Multi-alloy By Thermal Reduction Of Titanium Slag Under High Gravity

Titanium-aluminum-based alloys have low density,high specific strength,good oxidation resistance and creep resistance at high temperatures,and can replace traditional nickel-based superalloys,and are favored in the fields of aerospace,aerospace and automotive engines.The traditional titanium-aluminum alloy has a long process flow,high cost and complicated equipment,and the aluminum heat reduction process is short,the equipment is simple,the raw materials are cheap and easy to obtain,and the cost is low,but the aluminum heat reduction slag-gold separation effect is poor,in order to improve the slag-gold To the extent of separation,a titanium-aluminum-based alloy was prepared by aluminothermic reduction under supergravity conditions.Under the condition of supergravity,the super-gravity coefficient increases,the relative movement speed between fluids increases,the mass transfer process is strengthened,the slag-gold separation is promoted,and the alloy yield is improved.In order to realize the thermal reduction of aluminum under the condition of supergravity,the super-gravity test device was first modified by itself to realize on-line ignition,on-line heating and on-line temperature measurement.In this paper,the basic principle of preparation of titanium-aluminum-based multi-alloy and enhanced slag-gold separation under aluminum-thermal reduction of titanium slag under super-gravity conditions and the influence mechanism of Fe,Si and Mn on the brittleness of titanium-based alloys are studied theoretically.Through experiments,the effects of factors such as supergravity coefficient,rotation time and ignition mode on the degree of slag-gold separation,alloy yield,alloy density,hardness and microstructure were investigated.Finally,a relatively good supergravity process was obtained by orthogonal experiment.parameter.The experimental results show that the slag-gold separation degree is 60.7% and the alloy yield is 59.1% under normal gravity conditions.Under the condition of supergravity,the slag-gold separation degree is 81.1%,the increase is 20.4%,and the alloy yield is 84.2%.25.1%;under super-gravity conditions,the alloy structure is refined,the alloy density and hardness are improved,but the chemical composition of the alloy is basically unchanged before and after supergravity.The super-gravity aluminothermic reduction significantly improves the slag-gold separation effect,and provides a new idea for the preparation of titanium-aluminum-based alloy,which has certain academic and practical value.