H.c. Starck Gmbh

H.c. Stark Inc.

Anthony V Parise

Paul R Aimone

Prabhat Kumar

Robert W Balliett

Henning Uhlenhut

Thomas M Ramlow

Bruce A Coffin

Lithium niobate and tantalate crystal rods or boules are sawed to wafers with diamond edged saws in the presence of inert fluorinated lubricating liquids.

Cutting metallates of refractory metals

A method of making sheet bar and other precursors of formed products to be made by extensive working. The method includes providing a powder metal, preferably under 100 PPM oxygen content of non-spherical particles, compacting the powder into a coherent precursor form of at least 100 pounds, whereby a precursor is provided enabling extended fabrication to a finished product form. The finished product is resistant to breakup in fabrication due to oxide inclusion effect and produces a low oxygen end product. The method can process multiple species of metals that include at least one higher melting metal and one lower melting metal to produce an alloy or micro-composite of the metals as worked, where one metal is preferably a refractory metal (Ta, Nb, W, Wo, Zr, Hf, V and Re). The process is controlled to cause powder of the higher melting metal to be extended into a fibrous form.

Low oxygen refractory metal powder for powder metallurgy

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Nashua, NH, United States of America

Anthony V Parise