A kind of tungsten alloy formulation of high-density flying block and its low-temperature sintering preparation method
A high-density, tungsten alloy technology, applied in W-Ni-Mn alloy formula, tungsten-based high-density alloy formula, high-density fly block tungsten alloy formula and its low-temperature sintering preparation field, can solve the problem of poor powder formability and other problems, to achieve the effect of high density, high hardness and improved formability of the finished product
Active Publication Date: 2017-06-20
NANJING UNIV OF SCI & TECH +1
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Problems solved by technology
Due to its high sintering temperature and poor formability of the powder, there are still some problems when it is applied to fly blocks with complex shapes.
Method used
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Embodiment 1
[0029] A low-temperature sintering preparation method of high-density flying blocks, which is prepared according to the following method:
[0030] The first step is to add raw material powder into the reactor, add grinding medium ethanol and steel balls, mix and stir, the ratio of balls to materials is 3:1, and the mixing time is 12 hours.
[0031] In the second step, cold air volatilizes ethanol, puts the mixed powder into a mold coated with lubricant in advance, and presses at a high pressure of 200 MPa, and the lubricant is a mixed solution of zinc stearate and alcohol;
[0032] In the third step, the pressed fly block is sintered in a hydrogen atmosphere, the sintering temperature is 1120° C., and the sintering time is 2 hours, that is, a high-density fly block is obtained.
[0033] The tungsten alloy of the above-mentioned high-density flying block belongs to the W-Ni-Mn system in the tungsten-based high-density alloy, and specifically includes the following components. T...
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Abstract
The invention discloses a tungsten alloy formula of a high-density flyweight and a low-temperature sintering preparation method. The formula comprises the following ingredients: W powder, Ni powder, Mn powder, Cu powder, Co powder and Sn powder, wherein the mass ratio of W powder to Ni powder to Mn powder to Cu powder to Co powder to Sn powder is 90:3-5:3-5:0.5-1.5:0-1:1, crude W powder accounts for 60%, and fine W powder accounts for 40%. The optimum ratio is 90W-4Ni-4Mn-0.5Cu-0.5Co-1Sn. The preparation method is sintering in a hydrogen atmosphere at 1120 DEG C for 2h. In comparison with other inventions, the invention has the following advantages: by matching tungsten powders with different particle sizes and multiple alloy elements, shaping property of powders can be improved; multiple alloy elements are also beneficial to activated sintering; and 1% of the Sn powder can reduce sintering temperature by about 200 DEG C. By the orthogonal design method, influence of different mixture ratios on properties of high-density alloys is systematically studied. The obtained ratio with high cost performance is reliable and comprehensive and is of representative significance. In general, flyweights prepared by the formula and the preparation method have advantages of low sintering temperature, good sintering compactness, high overall quality and the like.
Description
technical field [0001] The invention relates to a tungsten-based high-density alloy formula, especially a W-Ni-Mn alloy formula in a tungsten-based high-density alloy, more precisely a tungsten alloy formula of a high-density flying block and its low-temperature sintering Preparation. The invention belongs to the technical field of tungsten alloy material and preparation. Background technique [0002] Tungsten Heavy Alloys (WHAs), also known as "high-density alloys" or "tungsten-based heavy alloys", is a kind of hard phase with tungsten, nickel, copper or nickel, iron, etc. Composite materials composed of binder phase. Tungsten-based high-density alloys have a series of excellent properties such as high density, high strength, good ductility, good toughness, and small thermal expansion coefficient. They are widely used in information, energy, metallurgy, aerospace, national defense, and nuclear industries. [0003] Flying block is a key part in the speed controller of the...
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IPC IPC(8): C22C27/04C22C1/04B22F1/00B22F3/16
Inventor 王广范李鹏申小平李蓉贺萍
Owner NANJING UNIV OF SCI & TECH