The Compatibilities of Boron and Germanium
Report Number: AFML TR 69-258
Author(s): Bidwell, Lawrence R.
Corporate Author(s): Air Force Materials Laboratory
Laboratory: Air Force Materials Laboratory
Date of Publication: 1969-10
Pages: 29
Contract: Laboratory Research - No Contract
DoD Project: 7353 - Characterization of Solid Phase and Interphase Phenomena in Crystalline Structures
Identifier: AD0863815
Abstract:
The salient features of the boron-germanium phase equilibrium diagram were deduced from X-ray diffraction, metallographic, thermal analysis, and electron microprobe studies on both sintered and melted alloys. The system can be characterized as a classical monotecticeutectic with no intermediate phases. The occurrence of hypomonotectic boron crystals and boron crystals grown from a germanium melt indicates a slight solubility of germanium in solid boron and of boron in liquid germanium at the monotectic temperature. X-ray diffraction, thermal analysis, and metallographic studies indicate that the germanium-rich liquid freezes as essentially pure germanium and that the solid solubility of germanium in boron and of boron in germanium is virtually nil at the eutectic temperature. The minute quantity of boron that does dissolve in solid germanium does so substitutionally with a 0.01 to 0.02 volume percent contraction of the germanium lattice. These results indicate that germanium may have utility as a boron diffusion barrier for boron fiber-reinforced metal-matrix composites.
Provenance: Lockheed Martin Missiles & Fire Control
Author(s): Bidwell, Lawrence R.
Corporate Author(s): Air Force Materials Laboratory
Laboratory: Air Force Materials Laboratory
Date of Publication: 1969-10
Pages: 29
Contract: Laboratory Research - No Contract
DoD Project: 7353 - Characterization of Solid Phase and Interphase Phenomena in Crystalline Structures
Identifier: AD0863815
Abstract:
The salient features of the boron-germanium phase equilibrium diagram were deduced from X-ray diffraction, metallographic, thermal analysis, and electron microprobe studies on both sintered and melted alloys. The system can be characterized as a classical monotecticeutectic with no intermediate phases. The occurrence of hypomonotectic boron crystals and boron crystals grown from a germanium melt indicates a slight solubility of germanium in solid boron and of boron in liquid germanium at the monotectic temperature. X-ray diffraction, thermal analysis, and metallographic studies indicate that the germanium-rich liquid freezes as essentially pure germanium and that the solid solubility of germanium in boron and of boron in germanium is virtually nil at the eutectic temperature. The minute quantity of boron that does dissolve in solid germanium does so substitutionally with a 0.01 to 0.02 volume percent contraction of the germanium lattice. These results indicate that germanium may have utility as a boron diffusion barrier for boron fiber-reinforced metal-matrix composites.
Provenance: Lockheed Martin Missiles & Fire Control