Scholarlink

<p>The electrical field-assisted sintering technique (FAST) is a pulsed direct current (DC) assisted sintering method used to consolidate powder/metals in a very short period of time. This solid-state sintering technique is used to sinter similar and dissimilar materials by applying high-density electrical current and uniaxial pressure. However, during the FAST process, the behavior of thermal–mechanical interactions in dissimilar materials, such as a copper coating embedded with a sapphire fiber, and SS316L, is insufficiently understood, and nonhomogeneous temperature distributions can lead to thermal stress concentration at the material interfaces. In this study, a Multiphysics finite element model was developed to investigate the temperature profile and stress gradients within a copper-coated embedded fiber-optic sensor with stainless steel 316&#xa0;L during the electrical field-assisted sintering technique (FAST) process. The simulation results showed that the maximum temperature occurred near the center of the SS316L powder compact surrounding the copper-coated fiber at around 818.44&#xa0;°C. Although the highest equivalent (von Mises) stress of around <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:1.046\times\:{10}^{8}\:\text{P}\text{a}\:\)</EquationSource> </InlineEquation>or <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:104.6\:\text{M}\text{P}\text{a}\)</EquationSource> </InlineEquation> was observed on the sapphire sensor region, the copper coating had a lower normal stress of 4.67&#xa0;MPa. A small deformation was observed in the fiber region. This finding demonstrates that the influence of material-property mismatches on temperature gradients and stress localization during the FAST process, as well as the importance of optimizing process conditions to improve mechanical properties. It ensures fiber-optic bonding with copper-coated 316&#xa0;L stainless steel and enables its use in high-temperature applications.</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

Multiphysics modeling of electrical field-assisted sintering technique (FAST) process for embedding a sapphire fiber-optics sensor with copper coating into stainless steel 316 L

  • 期刊论文

  • 发表日期：

    2026年7月6日

查看全文
  • Razaul Islam,
  • Philip Henry Green,
  • Wei Li

摘要

The electrical field-assisted sintering technique (FAST) is a pulsed direct current (DC) assisted sintering method used to consolidate powder/metals in a very short period of time. This solid-state sintering technique is used to sinter similar and dissimilar materials by applying high-density electrical current and uniaxial pressure. However, during the FAST process, the behavior of thermal–mechanical interactions in dissimilar materials, such as a copper coating embedded with a sapphire fiber, and SS316L, is insufficiently understood, and nonhomogeneous temperature distributions can lead to thermal stress concentration at the material interfaces. In this study, a Multiphysics finite element model was developed to investigate the temperature profile and stress gradients within a copper-coated embedded fiber-optic sensor with stainless steel 316 L during the electrical field-assisted sintering technique (FAST) process. The simulation results showed that the maximum temperature occurred near the center of the SS316L powder compact surrounding the copper-coated fiber at around 818.44 °C. Although the highest equivalent (von Mises) stress of around \(\:1.046\times\:{10}^{8}\:\text{P}\text{a}\:\) or \(\:104.6\:\text{M}\text{P}\text{a}\) was observed on the sapphire sensor region, the copper coating had a lower normal stress of 4.67 MPa. A small deformation was observed in the fiber region. This finding demonstrates that the influence of material-property mismatches on temperature gradients and stress localization during the FAST process, as well as the importance of optimizing process conditions to improve mechanical properties. It ensures fiber-optic bonding with copper-coated 316 L stainless steel and enables its use in high-temperature applications.