초록 ▼

A process and related compositions for lowering the electrical resistivity of ZrB2 are described. In a preferred embodiment, ZrH2 or Zr powder is blended with the ZrB2 powder and the composite is vacuum hot pressed at 2100°C. The elemental Zr so formed can be beneficial by gettering impurities such

A process and related compositions for lowering the electrical resistivity of ZrB2 are described. In a preferred embodiment, ZrH2 or Zr powder is blended with the ZrB2 powder and the composite is vacuum hot pressed at 2100°C. The elemental Zr so formed can be beneficial by gettering impurities such as oxygen, nitrogen, and carbon, and by altering the overall ZrB2 stoichiometry, e.g., to ZrB1.97. 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.

대표청구항 ▼

A composition having an empirical formula Zry M1-yB2-x, wherein 01, 0.031.0, and M when present is selected from the group consisting of alkali, alkaline earth, transition, lanthanide, and actinide metals, and carbon, the composition having an elemental Zr phase uniformly dispersed within the compos

A composition having an empirical formula Zry M1-yB2-x, wherein 01, 0.031.0, and M when present is selected from the group consisting of alkali, alkaline earth, transition, lanthanide, and actinide metals, and carbon, the composition having an elemental Zr phase uniformly dispersed within the composition.