Patent ID: 8277723
Filing Date: 2012-10-02
Classification: B22D,C22B,C22C,C23C,H01L

Abstract:
1. High-purity hafnium having a purity of 6N or higher excluding Zr and gas components and total impurities excluding Zr and gas components of 1 ppm or less, wherein Fe content is 0.01 to 0.05 ppm, Cr and Ni are respectively 0.2 ppm or less, Ca, Na and K are respectively 0.1 ppm or less, Al, Co, Cu, Ti, W and Zn are respectively 0.1 ppm or less, U and Th are respectively less than 1 ppb, and Pb and Bi are respectively less than 0.1 ppm.