ZrB.sub.2 phase with enhanced electrical and thermal conductivit

Details ZrB.sub.2 phase with enhanced electrical and thermal conductivit ZrB.sub.2 phase with enhanced electrical and thermal conductivit

1991-09-06

1993-09-28

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501102, 252512, C04B 3558

Patent

active

052486397

ABSTRACT:
A process and related compositions for lowering the electrical resistivity of ZrB.sub.2 are described. In a preferred embodiment, ZrH.sub.2 or Zr powder is blended with the ZrB.sub.2 powder and the composite is vacuum hot pressed at 2100.degree. C. The elemental Zr so formed can be beneficial by gettering impurities such as oxygen, nitrogen, and carbon, and by altering the overall ZrB.sub.2 stoichiometry, e.g., to ZrB.sub.1.97. Excess Zr is present in the matrix as a finely dispersed material. A variety of dopant materials can also be used to alter the electrical, thermal, and mechanical properties. Samples exhibiting this Zr-rich second phase exhibit lower electrical resistivities, higher thermal conductivities, better thermal shock resistance.

REFERENCES:
patent: 4929417 (1990-05-01), Watanabe
"Galvanomagnetic Effects in single Crystal Z.sub.r B.sub.2 ", J. Piper, J. Phys. Chem. Solids, vol. 27, pp. 1907-1915, 1966.
"Thermal Expansion Studies on the Groups IV-VII Transition Metal Diborides", B. Lonnberg, J. of Less-Common Metals, 141, pp. 145-156, 1988.
"Hall Effect & Electrical Conductivity of Transition-Metal Diborides", H. J. Juretschke & R. Steinitz, J. Phys. Chem. Solids, vol. 4, pp. 118-127, 1958.
"Electronic Structure & Charge Density of Zirconium Diboride", A. Switendick; The Electron Fermi Surface of HfB.sub.2, T. Tanaka & Y. Ishizawa, 10th Intl. Symposium on Boron, Borides & Related Compounds, Albuquerque, NM, 8 pages each, Aug. 1990.

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