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Metal injection molding of titanium and titanium alloys (3)

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Binder formula

Titanium and titanium alloys have two feedstock systems. It is suggested that the formula is better than that in the range of Shrinkage from 1.166 to 1.220 as shown in Table 1 below. These formulations are already on the market.

Table 1: Binder formulation of Titanium and Titanium Alloys

OSF = Oversize Shrinkage Factor

Due to the oxidation of titanium and titanium alloys, it is suggested that the volume of  l in the formulation ratio should not exceed 63%, so as to avoid the possibility of friction between powder in injection molding and feedstock mixing. Once the friction temperature is too high, the possibility of oxidation will increase.

Notices for feedstock preparation

Particular attention should be paid to the control of the order of feedstock materials and the temperature of mixed feedstock, as described in Table 2. The mixing procedure of the two kinds of feedstock   is suggested. It is noticed that the mixing process must be carried out in order to protect the atmosphere for oxygen removal. It is also noted that all macromolecule binder particles or powders must be dried to ensure that there is no moisture, wax and stearic acid, which are difficult to dry, are low molecular binders. It is suggested that water be removed by low temperature vacuum.

Suggestions on feedstock mixing procedure

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