Mo Crucible and Assembling Mold

In order to save the cost, the production of Mo crucible mainly uses the assembling mold with the method of powder metallurgy. 

The feature of Mo crucible is that the part is composed of wall cylinder and the hypo-cone.

The ratio of height to thickness of the wall cylinder is close to 8. It is easy to generate the cracks on the surface during the manual pressing. Therefore, we use the assembling molds and adopt the method of powder metallurgy to solve this problem. Due to the friction between powders and between powder and molds, the pressure loss occurs during the pressing. We adopt the double-direction pressing in order to increase the density of hypo-cone and ensure the uniformity of green compact density. After finishing the first pressing, the die cushion will be removed and the second pressing starts. In order to facilitate the demolding of the hypo-cone of the Mo crucible from the base, the base is composed of three vertically and equitably separated block (include the die block, the upper die punch and the wall cylinder of the Mo crucible).

The advantages of using the assembling molds are listed as below:

1.0 The use of assembling mold for pressing can help control the density of various parts of Mo crucible, and ensure that the density of parts of the parts are consistent.Therefore, it improves the performance of the process.

2.0 The adoption of double-direction pressing compensates for the low density caused by the pressure loss and increases the density of every part.

3.0 The base of assembling mold is composed of three parts which can solve the problem that the hypo-cone part is not easily demolded. The application of assembling mold is one of the effective ways to produce the Mo crucible. The promotion of this method can show the feature of powder metallurgy production and accelerate the development of powder metallurgy industry.

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