In generally, when tungsten content is less than 90%, comprehensive properties of tungsten alloy decrease for overmuch binder phase. The decreasing of properties is primary shown that tensile strength and density of tungsten alloy is low, which cannot satisfy with the requirement of density and tensile strength. With the increasing of tungsten content, tensile strength of tungsten alloy increases slightly. However, with the increasing of sintering temperature, tungsten grain in tungsten alloy coarsens and elongation of tungsten alloy descends.

When tungsten content reaches 93%~95%, tungsten alloy has ideal microscopic structure. Tensile strength and elongation are the best. Continuation of adding tungsten content will make tungsten grain large and contact with tungsten grain will be increased consumedly too. Tensile strength of tungsten alloy decreases significantly. The elongation of tungsten alloy decreases closely to line with the increasing of tungsten content. When tungsten content is more than 97%, tensile strength and elongation decrease significantly. When tungsten content is more than 98%, the elongation of tungsten alloy is closed to zero. So, to achieve better comprehensive properties, the tungsten content is usually controlled between 90% and 96%.


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Tungsten heavy alloy parts are specially made from tungsten heavy alloy. They own the properties of high temperature recrystallization, high ductility and excellent wear-resistant. The recrystallization temperature of tungsten heavy alloy part is higher than 1,500℃.

Application
1. Tungsten heavy alloy parts can be widely used in illumination, electric vacuum device, tube component element in cathode-ray pipe and power semiconductor device
2. They are also adopted in tools for manufacturing glass and glass fiber, internal part in light bulbs, high temperature heat shield and annealing filament and electrode
3. Tungsten heavy alloy parts are also produced for high temperature container and component in microwave magnetron
4. Other applications of tungsten heavy alloy parts:Balancing weights; High temperature moulds; Protection shields for high-energy rays Electro-heat upsetting anvil block; The core of armour piercing shell.

Features
1. The density and hardness of tungsten heavy alloy parts is higher than that of other material-made rods. They have a very high density between 16.8g/cm3 to 18.75g/cm3;
2. They possess high temperature and corrosion resistance properties;
3. The alloy parts have wonderful shock resistance and machinery plasticity;
4. Tungsten heavy alloy parts are of low thermal expansion coefficient high absorption capacity of high-energy rays.


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Applications:
1.Sintered tungsten tubes are widely applied in industry furnace such as sapphire growth furnace, quartz glass melting furnace, and rare earth smelting furnace since the melting point of tungsten has reached 3410℃; 
2.Tungsten tubes are more and more widely used in solar, photovoltaic industry and quartz glass melting field because of its high utilization.

Features:
1.The overall density of sintered tungsten tube is between 18g/cm3 to 18.3g/cm3;
2.Its purity is over 99.95%

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Elongation and strength of tungsten alloy are sensitive to tungsten alloy porosity. Gas exists in the pore and makes pore happen Ostwald ripening Coarsening, during sintering. Lengthening soaking time will cause bulk effect to billets. When porosity is larger than 0.5%~1.0%, the porosity has serious influence on the characteristics of high density alloy, even more serious than interface segregation of oxygen.

Chun researched about the influence on the characteristic of alloy caused by the formation of pore in W-Ni-Fe alloy. When relative density of alloy was 99%, the shapes and sizes of relic tiny pore could also cause significantly descending or instability of alloy. German researched about the influence on elongation of tungsten caused by porosity. When soaking time was longer than 2h, the pore would grow seriously and the elongation of tungsten alloy descended. While the porosity is larger than 1%, the elongation of tungsten alloy would descend sharply.


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