Wah Chang

Total hafnium available worldwide from nuclear zirconium production is estimated to be 130 metric tons annually. The annual usage, in all forms, is about 85 t. The balance is held in inventory in stable intermediate form such as oxide by the producers Teledyne Wah. Chang (Albany, Oregon) and Western Zirconium in the United States Ce2us in France Prinieprovsky Chemical Plant in Ukraine and Chepetsky Mechanical Plant in Russia (crystal bar). 

Hafnium, brochure. Teledyne Wah Chang Corp., Albany, Oreg., 1987, p. 11. 

Fig. 5. Vacuum-distilled titanium sponge produced by magnesium reduction at Teledyne Wah Chang (Albany, Oregon).

In the initial thiocyanate-complex Hquid—Hquid extraction process (42,43), the thiocyanate complexes of hafnium and zirconium were extracted with ether from a dilute sulfuric acid solution of zirconium and hafnium to obtain hafnium. This process was modified in 1949—1950 by an Oak Ridge team and is stiH used in the United States. A solution of thiocyanic acid in methyl isobutyl ketone (MIBK) is used to extract hafnium preferentially from a concentrated zirconium—hafnium oxide chloride solution which also contains thiocyanic acid. The separated metals are recovered by precipitation as basic zirconium sulfate and hydrous hafnium oxide, respectively, and calcined to the oxide (44,45). This process is used by Teledyne Wah Chang Albany Corporation and Western Zirconium Division of Westinghouse, and was used by Carbomndum Metals Company, Reactive Metals Inc., AMAX Specialty Metals, Toyo Zirconium in Japan, and Pechiney Ugine Kuhlmann in France. 

A number of cemented carbide producers market some or all primary materials, ranging from monocarbides to binary or ternary soHd solutions involving TiC, TaC, NbC, or WC. Among the suppHers offering these materials are Keimametal Inc., GTE Products Corp., Teledyne Wah Chang, and Tokyo Tungsten Co. Ltd. Keimametal Inc, also manufactures TiN and TiCN powders. 

ASME Sect. VIII, Div. 2, 1986 Edition Teledyne Wah Chang Albany... 

Columbium (Niobium), Teledyne Wah Chang Albany, PO Box 460, Albany, Oregon. 

Palladium-based dense metallic membranes have been known to be completely selective for hydrogen permeation and are used in commercially available small-scale hydrogen purification units (e.g., Johnson Matthey, 2007 REB Research, 2007 Power + Energy, 2007 ATI Wah Chang, 2007). These hydrogen purification units typically use palladium-alloy... 

ATI Wah Chang, Palladium-Based Metal Membrane, available at http //www.wahchang.com/ pages/products/data/pdf/Hydrogen%20Metal%20Membrane.pdf (accessed July 2007). 

Assumes a <20 pm thick Nb cladding layer over a 130 pm steel core. Cost information is based on discussions with ATI Wah Chang, a leading worldwide producer of Nb sheet product. 

Spectrullte Consortium Inc Teledyne Cast products Teledyne Wah Chang... 

Teledyne Wah Chang Union Carbide Corp., Nuclear Div. Wellman Dynamics Corp. Westinghouse Materials Co. of Ohio ... 

Hafnium , Promotional Brochure, Teledyne Wah Chang Albany (no date) (no number)... 

Anon, Internal Memorandum, Tele dyne Wah Chang Albany (July 26,1978) 31) LM. Lee... 

The author thanks Teieayne Wah Chang Albany, Inc, for the use of the company s files on ordnance applications of Zr and Hf, and Mr. DP. Tetz for his helpful assistance... 

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