The Dependence of Sinterability of Ni-Added W-Powder Compact on the Contact Neck Size of W-Particles
The relation between sinterability and contact neck size was investigated for Ni-doped W-powder compacts. The various sizes of the W-contact neck were obtained by a variation in the degree of presintering of the W-powder compact before Ni-addition. The sintering behaviour of the Ni-doped W-compact was investigated by measuring the sintering shrinkage and the electrical resistivity change.
The sinterability of the Ni-doped W-compact depended on the size of the contact neck: it was decreased by increasing the radius of the curvature of neck surface in W-contact. Judging from the change of the electrical resistivity, Ni added to W seems to be mostly located on the neck surface of W-contact. These experimental findings contribute to better understanding of the sintering mechanism of Ni-doped W-compacts.
KeywordsPorosity Nickel Rubber Tungsten Shrinkage
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