Grade gold material micro hybrid material crushing process discussed

Experimental Methods (1) using different methods milling milling molybdenum-copper powder, compared to different milling manner of molybdenum-copper composite powder properties,

find out the best way to milling. (2) using the above test to determine the best way to milling, ball milling time was 5,10,

15,20,25 h molybdenum-copper powder milling experiments to determine the optimum milling time, prepared to meet the requirements of nano-molybdenum-copper composite powder.  crusher manufacturer

Different milling methods and the relationship between particle size used in this experiment ordinary roller mill, planetary ball mill, high-energy ball milling manner three

different molybdenum-copper powder, compared to its particle size. A mixed powder of molybdenum-copper raw SEM photographs. General drum molybdenum-copper powder prepared by

ball milling

The molybdenum powder, copper powder and nickel powder, mixed with a certain proportion in the QM-2SP16 roller ball mill grinding. Ball to powder ratio of 10:1, ball speed is

150r/min, milling time of 200h. 2 is a roller ball molybdenum SEM photograph of the copper powder.  double roller crusher

From the roller ball 200h SEM photograph of molybdenum-copper powder can be seen as good plasticity of copper powder, copper phase of willow-like, and the uneven distribution of

copper was not observed in the molybdenum powder coated surface, indicating roller milling on Copper crushing effect is not good. Furthermore, the maximum particle of molybdenum

powder

Up to 5 ~ 10μm, and thus description of its use manner milling drum speed is too slow, and not of the mechanical alloying, but the plastic deformation occurs copper,

molybdenum-copper powder may determine the size hardly changed.

Planetary ball milling the ratio of molybdenum-copper powders suitable molybdenum powder, copper powder and nickel powder mixed in XXQ-200 planetary ball mill, ball mill, ball

to powder ratio of 10:1, ball speed is 400r/min, milling 48h. Three planetary ball milling for 48h SEM photograph of molybdenum-copper powder. The Planets

After milling, can be found in the willow-like copper phase becomes smaller, and the distribution is uneven, but the particle size of the powder particle size thinner than the

original, the size of about 5μm. Description milling process on the planet continues to smaller particle size, but did not reach the nanometer scale.

High Energy Ball Milling proportionally molybdenum-copper powder with a good molybdenum, copper and nickel powder in SPEX8000M high energy ball mill milling. Ball to powder

ratio of 10:1, ball speed is 400r/min, milling time of 20h. 4 is a high-energy ball milling of copper powder molybdenum 25h SEM photograph.

Different energy ball milling time and the relationship between the raw material powder size molybdenum powder, copper powder and nickel powder by mixing after SPEX8000M high

energy ball mill 5,10,15,20,25 h high energy ball milling. 5 for the different energy ball milling milling time powder X-ray spectrum.

It can be seen from the 5, Mo-Cu mixed powder within the structure of the mechanical alloying process, the powder repeated deformation, local strain increases, causing the

defect density is increased, the local shear with a density of defects such as the critical value, grain crushing. This process is repeated crystallization

Continue to refine the grain until it reaches the nanoscale. The extension of the milling time, Mo and Cu diffraction peak broadening, until the Cu peak disappears. Shows Mo and

Cu alloy powder is a solid transition remains. In the high-energy ball milling 25h after the formation of nano-powder, a considerable part of the Cu segregation provided in Mo

Large number of grain boundaries, thus losing the diffraction characteristics, namely the X-ray diffraction spectrum, showed a single phase structure.

Calculated using the approximate function method, under different milling time Mo-Cu composite powder having an average grain size. The results show that the beginning of the

powder particle size decreased rapidly, slowing down after a certain size, then welded powder milling process to reach equilibrium with the crusher. After 25h

After grinding Mo-Cu composite powder having a particle size up to about 30nm.

High-energy ball milling time of different Mo-Cu powder as 6 shows an SEM photograph (25h milling molybdenum copper powder morphology see Figure 4).

As can be seen from the 6,4, short-energy ball milling of powders with visible metal foil for powder welding fit. This is because the elastic modulus of molybdenum is very high,

difficult to deform, is brittle material.

Copper good plasticity. Milling process, molybdenum, copper powder particles two elements are not the same as the process of change, molybdenum powder brittle material under the

impact ball deformation difficult, and when the collision intensity exceeds the breaking strength after the molybdenum powder, molybdenum powder occurs fracture, due Powders

Cu has good ductility, powder ball impact, the copper deformation occurs first, into a sheet, plate. Milling in progress, constantly breaking refine molybdenum powder, and

copper is deformed broadening, collision copper molybdenum powder will be captured, and then in the role of ball

Molybdenum is crashed or pressed into copper, the formation of Mo-Cu composite powder. Molybdenum is not blindly fracture, thinning, when molybdenum particle fracture, the

fracture surface is fresh atomic surface activity is high. If a collision course, just two fresh fracture surface molybdenum particles have repeatedly broken in touch

Split and re-welded back and forth for, continue to occur, the powder particle size also will continue to refine, and ultimately the formation of a uniform distribution of

copper phase coated with molybdenum molybdenum-copper composite powder nano.

Conclusions (1) By way of different milling powder morphology, general milling, planetary ball mill structure and composition can not be uniformly distributed nano-alloy powder,

and high-energy ball milling method can be obtained. (2) by means of high-energy ball milling for different times of the powder morphology can be

Seen after 25h ball milling, making the powder subjected to calendering, lamination, crushed in pressing (ie cold welding - crush - then cold welding) iterative process, the

final structure and composition can be uniformly distributed nano-alloy powder . (3) by means of high-energy ball milling for different times of the powder X-ray

Diffraction, it can be seen by high energy ball milling molybdenum 25h disappearance Cu phase Cu powder, a considerable part of the Cu Mo Segregation provided in a large number

of grain boundaries of the alloy powder is calculated nm 30nm.