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Lost Mold-Rapid Infiltration Forming of Mesoscale Ceramics: Part 2,Geometry and Strength Improvements

机译:中型陶瓷的快速脱模渗透成型:第2部分,几何形状和强度改进

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摘要

Iterative process improvements have been used to eliminate strength-limiting geometric flaws in mesoscale bend bars composed of yttria-tetragonal zirconia polycrystals (Y-TZP). These improvements led to large quantities of high bend strength material. The metrology of Y-TZP mesoscale bend bars produced using a novel lost mold-rapid infiltration-forming process (LM-RIF) is characterized over several process improvements. These improvements eliminate trapezoidal cross sections in the parts, reduce concave upper surfaces in cross section, and minimize warping along the long axis of 332 × 26 × 17 μm mesoscale bend bars. The trapezoidal cross sections of earner, first-generation parts were due to the absorption of high-energy ultraviolet (UV) light during the photolithographic mold-forming process, which produced nonvertical mold walls that the parts mirrored. The concave upper surfaces in cross section were eliminated by implementing a RIF-buffing process. Warping during sintering was attributed to impurities in the substrate, which creates localized grain growth and warping as the tetragonal phase becomes destabilized. Precision in the part dimensions is demonstrated using optical profllometry on bend bars and a triangular test component. The bend bar dimensions have a 95% confidence interval of < ±1 μrn, and the tip radius of the triangular test component is 3 μrn, consistent with the UV-photoh'thographic process used to form the mold cavities. The average bend strength of the mesoscale Y-TZP bend exceeds 2 GPa with a Weibull modulus equal to 6.3.
机译:迭代过程改进已用于消除由氧化钇-四方氧化锆多晶体(Y-TZP)组成的中尺度弯曲棒中强度受限的几何缺陷。这些改进导致大量的高弯曲强度材料。 Y-TZP中尺度弯杆的度量衡是使用经过改进的几种新型脱模快速渗入成型工艺(LM-RIF)制成的。这些改进消除了零件中的梯形横截面,减少了横截面的凹入上表面,并使沿332×26×17μm中尺度弯曲棒长轴的翘曲最小化。第一代承印物的梯形横截面是由于在光刻模具成型过程中吸收了高能紫外(UV)光而产生的,这些非垂直模具壁会被零件镜像。通过实施RIF抛光工艺消除了横截面中的凹入上表面。烧结过程中的翘曲归因于基底中的杂质,当四方相变得不稳定时,这会导致局部晶粒生长和翘曲。零件尺寸的精确度通过对弯杆和三角形测试部件的光学轮廓测量来证明。弯杆尺寸的95%置信区间为<±1μrn,三角形测试部件的尖端半径为3μrn,与用于形成模具型腔的UV照相光刻工艺一致。中尺度Y-TZP弯曲的平均弯曲强度超过2 GPa,威布尔模量等于6.3。

著录项

  • 来源
    《Journal of the American Ceramic Society》 |2009年第1期|70-78|共9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
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