Ductility of tungsten alloy is very sensitive to residual porosity. For tungsten alloy whose tungsten content is 94%~97%, when porosity in alloy is only 1%~1.5%, tungsten alloy will be tendered completely. There are 4 reasons for causing pore containing excessive burning, rapid cooling and solidification, volatile elements existing in tungsten alloy and uneven sintering.

When tungsten pellet being spheroidized completely, connectivity of tungsten pellet is the lowest and elongation of tungsten alloy reaches maximum with that. Then pore will grow with the increasing time of sintering. Tungsten alloy will tender. When liquid sintering is finished, hydrogrn spreads rapidly in solidifying liquid phase and it causes shrinking pore when liquid phase is solidified. For that liquid phase should cool slowly. When cooling rate is higher than 10℃/min, tungsten alloy will cause more pore pores and ductility of tungsten alloy will descend. For sample whose size is large, when cooling rate is low, tungsten alloy will cause pore because of gaseous diffusion and solidifying contraction.


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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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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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