Research On The Microstructure And Properties Of ZrC/NbC Particles Reinforced Tungsten Copper Composite

With the development of national science and technology,the electrical,military,and electronics fields are changing with each passing day.W-Cu composite materials are used in its key parts.In order to make W-Cu composite materials can be better applied in these fields,and can be applied in more severe service environment,there are higher requirements for the preparation of new W-Cu composite materials with excellent comprehensive properties.This article uses powder metallurgy to prepare tungsten copper composite materials.First of all,according to the performance characteristics of tungsten copper composite materials,select the additive phase to enhance the performance of the tungsten framework.Through the existing research,choose to add x wt.%ZrC or NbC(x=0.5,2.0,4.0),and use different powder mixing methods(V-type mixer for powder mixing,planetary ball mill,mortar grinding)to prepare composite materials.Studies have shown that sub-micron tungsten copper composite materials have excellent performance in density,compression/tensile strength,friction and wear,and arc ablation resistance.Study the improvement of the structure,electrical conductivity,hardness,density,and room temperature/high temperature compression performance of different content of ZrC or NbC particles on submicron tungsten copper composites.Secondly,the original powder morphology of the prepared tungsten copper composite material also has a great influence on the performance of the composite material.The tungsten-copper composite material is prepared by using spherical powder with a different morphology from the previous powder,and the effect of the initial powder morphology on the structure and properties of the material is studied.Finally,the tungsten-copper composite material prepared by adding ZrC particles reinforced spherical initial powder,by adding different content to induce copper powder to increase the material density,and study the effect on the performance of the composite material:(1)Add x wt.%ZrC(x=0.5,2.0,4.0)to enhance tungsten copper composite material,and mix the initial powder with three different mixing methods.Research on the uniformity of the structure,it is found that the composite materials prepared by the V-type mixer and planetary ball mill have good uniformity.Conduct conductivity,hardness,density,room temperature compression deformation,high temperature compression deformation tests on the material.The comprehensive test results show that the 0.5ZrC-WCu composite material prepared by the V-type mixer has the best comprehensive performance.(2)Add x wt.%NbC(x=0.5,2.0,4.0)to enhance tungsten copper composite material.Three different mixing methods are also adopted.According to the analysis of the uniformity of the microstructure obtained by scanning,the uniformity of the composite material prepared by the planetary ball mill is the best.The addition of 2.0wt.%NbC can make the material have excellent comprehensive properties.The conductivity of the composite prepared by ball milling is 18.04 MS/m,the hardness is 233.25 HB,the density is 13.45 g/cm3,and the room temperature compressive strength is 1111.18 MPa.(3)Through the comparative study of the data obtained from the experiments in the first two chapters,it can be seen that the 0.5wt.%ZrC-WCu composite material prepared by the V-type mixer has excellent comprehensive properties.This chapter first studies the preparation of tungsten-copper alloys with spherical initial powders.The analysis shows that the composite materials prepared by spherical powders have improved performance compared with the existing researches on carbide-reinforced materials.In order to improve the density of the material,a tungsten-copper composite material made of 0.5wt.%ZrC reinforced spherical powder was prepared with different content of induced copper powder.The experimental results show that with the decrease of induced copper powder,the electrical conductivity decreases,the density and hardness of the composite material gradually increase,and the tensile/compression at room temperature gradually increases.