| Hot Isostatic Pressing of ZnS Powder and CVD ZnS
Ceramics: Comparative Evaluation of Physico-chemical,
Microstructural and Transmission Properties |
Pandu Ramavath, Papiya Biswas, Roy Johnson*, G. Jagan Reddy1 and P. Laxminarayana2
Pages : 299-302
DOI : 10.1080/0371750X.2014.931252 |
| Abstract |
| Polycrystalline transparent zinc sulphide (ZnS) monoliths were processed through chemical vapour deposition
(CVD) followed by hot isostatic pressing (HIP) at 975oC and 135 MPa pressure (samples were designated as CVDHIP).
Physico-chemical, microstructural and transmisson properties of the CVDHIP specimens were evaluated. The
results were compared with ZnS specimens processed through an alternative route of powder encapsulation and
hot isostatic pressing under identical conditions (samples were designated as PHIP). CVDHIP and PHIP ZnS
specimens exhibited close to theoretical densities of 4.086 and 4.079 g.cm–3 respectively. HIPing of CVD samples
exhibited a highly preferred orientation along (111) in comparison to powder HIPed samples. Microstructures
exhibited similar grain sizes for CVDHIP and PHIP ZnS specimens, however, the morphology of grains was different
with significant twinning in CVDHIP specimens. Transmission properties of CVDHIP were relatively high in
comparison to PHIP samples and also exhibited multispectral transmission properties in the wavelength range of
0.4-10 am. |
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