Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Abstract A chalcogenide glass-ceramic (0.3 PbSe-0.7 Ge1.5 As0.5 Se3) which transmits in the infra-red region between 8 and 12 μm was produced from a phase separated parent glass. The glass transition temperature (T g) was increased from 280 to ∼ 340°C by crystallizing the phase with the lowerT g. Further heat-treatment produced a glass-ceramic that was up to 60% crystalline and contained PbSe, PbSe2 and GeSe2 crystals with a gran size of ∼ 0.5 μm. The infra-red transmission of the glass-ceramic decreased with increased crystallinity. The glass-ceramic modulus of rupture (38 MN m−2) was increased to as much as twice that of the glass and the Vickers hardness increased by 30% to ∼ 280 kg mm−2.
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