Effect of Mo metal foil shielding on infrared transmission of spark plasma sintered ZnS ceramics
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Fabrication of infrared (IR) transparent ZnS ceramics by spark plasma sintering (SPS) suffers from carbon contaminationdue to the graphite mold in the SPS system. In the present work, we consolidated transparent ZnS ceramics by SPS using Mometal foil to prevent the generation of carbonate and/or carbon impurities in the sintered product. The effect of Mo foil oncarbon contamination and IR transmittance was investigated. The Fourier transform infrared spectroscopy (FTIR) resultsrevealed that the C-O absorption peak was significantly reduced, however, sulfur vacancies were generated, thus, deterioratingthe overall transmittance. The sulfur vacancies were eliminated by post-annealing the specimen in a nitrogen atmosphere,whereby the overall IR transmittance was partially recovered. The results indicate that metal foil wrapping of green bodiescould be potentially applicable for the fabrication of carbon contamination-free ZnS ceramics via SPS system.
Abstract
Fabrication of infrared (IR) transparent ZnS ceramics by spark plasma sintering (SPS) suffers from carbon contaminationdue to the graphite mold in the SPS system. In the present work, we consolidated transparent ZnS ceramics by SPS using Mometal foil to prevent the generation of carbonate and/or carbon impurities in the sintered product. The effect of Mo foil oncarbon contamination and IR transmittance was investigated. The Fourier transform infrared spectroscopy (FTIR) resultsrevealed that the C-O absorption peak was significantly reduced, however, sulfur vacancies were generated, thus, deterioratingthe overall transmittance. The sulfur vacancies were eliminated by post-annealing the specimen in a nitrogen atmosphere,whereby the overall IR transmittance was partially recovered. The results indicate that metal foil wrapping of green bodiescould be potentially applicable for the fabrication of carbon contamination-free ZnS ceramics via SPS system.
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