Scholarlink

<p>This study examines the influence of vacuum hot pressing (VHP) conditions on the microstructure, density, and optical properties of ZnSe ceramics. Graphite and titanium foils, as well as alumina powder, were used to isolate the compact from the graphite mold, thereby enabling the variation in carbon contamination levels. Carbon was found to significantly affect the sintering and recrystallization of ZnSe ceramics, hindering the achievement of high density and transparency. Microstructural analysis revealed that the use of alumina as an insulating layer promotes more uniform grain growth, while minimizing abnormal grain enlargement. Spectral analysis demonstrated that maximum infrared (IR) transparency was achieved in samples with initial densities exceeding 97% after additional hot isostatic pressing (HIP). However, further enhancement of the optical properties necessitates the complete elimination of carbon contamination, which demands the replacement of graphite tooling in the VHP process.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hot Pressing Conditions of CVD ZnSe Powder Influence the Properties of Optical Ceramics

  • 期刊论文

  • 发表日期：

    2025年5月16日

查看全文
  • N. A. Timofeeva,
  • S. S. Balabanov,
  • T. O. Evstropov,
  • A. V. Naumova,
  • S. V. Filofeev,
  • R. S. Kovylin

摘要

This study examines the influence of vacuum hot pressing (VHP) conditions on the microstructure, density, and optical properties of ZnSe ceramics. Graphite and titanium foils, as well as alumina powder, were used to isolate the compact from the graphite mold, thereby enabling the variation in carbon contamination levels. Carbon was found to significantly affect the sintering and recrystallization of ZnSe ceramics, hindering the achievement of high density and transparency. Microstructural analysis revealed that the use of alumina as an insulating layer promotes more uniform grain growth, while minimizing abnormal grain enlargement. Spectral analysis demonstrated that maximum infrared (IR) transparency was achieved in samples with initial densities exceeding 97% after additional hot isostatic pressing (HIP). However, further enhancement of the optical properties necessitates the complete elimination of carbon contamination, which demands the replacement of graphite tooling in the VHP process.