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Lost Mold Rapid Infiltration Forming of Mesoscale Ceramics: Part 1, Fabrication

机译:中型陶瓷的脱模快速渗透成型:第1部分,制造

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摘要

Free-standing mesoscale (340 urn × 30 μm × 20 urn) bend bars with an aspect ratio over 15:1 and an edge resolution as fine as a single grain diameter (~400 nm) have been fabricated in large numbers on refractory ceramic substrates by combining a novel powder processing approach with photoresist molds and an innovative lost-mold thermal process. The colloid and interfa-cial chemistry of the nanoscale zirconia particulates has been modeled and used to prepare highly concentrated suspensions. Engineering solutions to challenges in mold fabrication and casting have yielded free-standing, crack-free parts. Molds are fabricated using high-aspect-ratio photoresist on ceramic substrates. Green parts are formed using a rapid infiltration method that exploits the shear thinning behavior of the highly concentrated ceramic suspension in combination with gelcasting. The mold is thermally decomposed and the parts are sintered in place on the ceramic substrate. Chemically aided attrition milling disperses and concentrates the as-received 3Y-TZP powder to produce a dense, fine-grained sintered microstructure. Initial three-point bend strength data are comparable to that of conventional zirconia; however, geometric irregularities (e.g., trapezoidal cross sections) are present in this first generation and are discussed with respect to the distribution of bend strength.
机译:在耐火陶瓷基板上大量制造了长宽比超过15:1且边缘分辨率与单个晶粒直径(〜400 nm)一样细的自立中尺度(340 urn×30μm×20 urn)弯曲棒通过将新颖的粉末加工方法与光刻胶模具和创新的失模热处理相结合。纳米氧化锆颗粒的胶体和界面化学已经建模并用于制备高浓度的悬浮液。应对模具制造和铸造挑战的工程解决方案产生了独立的,无裂纹的零件。使用高纵横比光刻胶在陶瓷基板上制造模具。使用快速渗透方法形成生坯,该方法利用了高浓度陶瓷悬浮液的剪切稀化行为以及凝胶浇铸。将模具热分解,然后将零件烧结在陶瓷基板上的适当位置。化学辅助的研磨磨使分散的3Y-TZP粉末分散并浓缩,以产生致密的细晶粒烧结微结构。初始的三点弯曲强度数据与常规氧化锆的数据相当。然而,在第一代中存在几何不规则(例如梯形横截面),并且关于弯曲强度的分布进行了讨论。

著录项

  • 来源
    《Journal of the American Ceramic Society》 |2009年第1期|63-69|共7页
  • 作者单位

    Department of Materials Science and Engineering, the Pennsylvania State University, University Park, Pennsylvania 16802;

    Department of Materials Science and Engineering, the Pennsylvania State University, University Park, Pennsylvania 16802;

    Department of Materials Science and Engineering, the Pennsylvania State University, University Park, Pennsylvania 16802;

    Department of Materials Science and Engineering, the Pennsylvania State University, University Park, Pennsylvania 16802;

    Department of Mechanical and Nuclear Engineering, the Pennsylvania State University, University Park, Pennsylvania 16802;

    Department of Mechanical and Nuclear Engineering, the Pennsylvania State University, University Park, Pennsylvania 16802;

    Department of Materials Science and Engineering, the Pennsylvania State University, University Park, Pennsylvania 16802;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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