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首页> 外文学位 >Selective laser sintering of alumina and alumina-zinc borosilicate glass composites using monoclinic hydrogen borate as a binder.
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Selective laser sintering of alumina and alumina-zinc borosilicate glass composites using monoclinic hydrogen borate as a binder.

机译：使用单斜硼酸氢盐作为粘合剂的氧化铝和氧化铝-硼锌锌玻璃复合材料的选择性激光烧结。

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摘要

Selective Laser Sintering (SLS) is a form of Solid Freeform Fabrication (SFF), which generates three-dimensional parts directly from a computer image. The objective of this dissertation is to develop new inorganic binders for the SLS of alumina ({dollar}rm Alsb2Osb3{dollar}), which is used commercially for various structural and functional applications.; A new low melting inorganic binder, monoclinic HBO{dollar}sb2{dollar}, has been developed for SLS of alumina. It leads to better green SLS parts and higher bend strength for green and fired parts compared to other inorganic binders such as aluminum and ammonium phosphate. This appears to be due to its low viscosity and better wettability of the alumina particle surface. A low density single phase ceramic, aluminum borate ({dollar}rm Alsb{lcub}18{rcub}Bsb4Osb{lcub}33{rcub}{dollar}), and multiphase ceramic composites, {dollar}rm Alsb2Osb3{dollar}-Al{dollar}rmsb4Bsb2Osb9,{dollar} have been successfully developed by laser processing of alumina-monoclinic HBO{dollar}sb2{dollar} powder blends followed by post-thermal processing; both {dollar}rm Alsb{lcub}18{rcub}Bsb4Osb{lcub}33{rcub}{dollar} and {dollar}rm Alsb4Bsb2Osb9{dollar} have whisker-like grains. The physical and mechanical properties of these SLS-processed ceramic parts are correlated to the materials and processing parameters. Further densification of the {dollar}rm Alsb2Osb3{dollar}-Al{dollar}rmsb4Bsb2Osb9{dollar} composites has been carried out by infiltration of alumina sol, colloidal silica, and chromic acid into these porous SLS parts followed by heat-treatment at higher temperature (1600{dollar}spcirc{dollar}C). The densities obtained after infiltration and subsequent firing are between 50 and 80% of the theoretical densities; the bend strengths are between 15 and 30 MPa.; In addition, glass-ceramic composites have been successfully fabricated through a post-processing of green SLS parts obtained with alumina-zinc borosilicate glass composites using monoclinic HBO{dollar}sb2{dollar} as an intermediate binder. Effects of glass content, sintering temperature, and alumina particle size on the densification and strength of alumina-zinc borosilicate glass composite parts have been investigated. Especially, fully dense glass-ceramic parts could be obtained by employing Ceracon forging process. Bend strengths of these Ceracon forged composite parts reach as high as 70 to 110 MPa.; The present investigation demonstrates that monoclinic HBO{dollar}sb2{dollar} is a potentially useful inorganic binder for the SLS of alumina to obtain structurally sound parts. It may prove useful in the future with other ceramic systems as well.
机译：选择性激光烧结（SLS）是固体自由成形（SFF）的一种形式，可直接从计算机图像生成三维零件。本论文的目的是开发用于氧化铝的SLS的新的无机粘合剂（{rm} Alsb2Osb3 {dollar}），其在商业上用于各种结构和功能应用。已开发出一种用于氧化铝SLS的新型低熔点无机粘结剂单斜HBO {dollar} sb2 {dollar}。与其他无机粘合剂（例如铝和磷酸铵）相比，它可产生更好的绿色SLS零件，以及绿色和烧结零件的更高弯曲强度。这似乎是由于其低粘度和氧化铝颗粒表面更好的润湿性。低密度单相陶瓷硼酸铝（{dol} rm Alsb {lcub} 18 {rcub} Bsb4Osb {lcub} 33 {rcub} {dollar}）和多相陶瓷复合材料{dol} rm Alsb2Osb3 {dollar} -Al rmsb4Bsb2Osb9，{dollar} rmsb4Bsb2Osb9，已通过激光处理氧化铝单斜HBO {dollar} sb2 {dollar}粉末混合物，然后进行后热处理而成功开发； {dollar} rm Alsb {lcub} 18 {rcub} Bsb4Osb {lcub} 33 {rcub} {dollar}和{dollar} rm Alsb4Bsb2Osb9 {dollar}都具有晶须状的晶粒。这些经过SLS处理的陶瓷零件的物理和机械性能与材料和加工参数相关。通过将氧化铝溶胶，胶体二氧化硅和铬酸渗透到这些多孔的SLS零件中，然后在较高的温度下进行热处理，进一步使{rm} rm Alsb2Osb3 {dollar} -Al {dollar} rmsb4Bsb2Osb9 {dollar}复合材料致密化温度（1600 {dollar} spcirc {dollar} C）。渗透和随后烧成后获得的密度为理论密度的50％至80％；弯曲强度在15和30MPa之间。此外，通过使用单斜晶HBO {dollar} sb2 {dollar}作为中间粘合剂，对用氧化铝-锌硼硅酸盐玻璃复合材料获得的绿色SLS零件进行后处理，成功地制造了玻璃陶瓷复合材料。研究了玻璃含量，烧结温度和氧化铝粒度对氧化铝-锌硼硅酸盐玻璃复合部件的致密化和强度的影响。特别是，通过采用Ceracon锻造工艺可以获得完全致密的玻璃陶瓷零件。这些Ceracon锻造复合材料零件的弯曲强度高达70到110 MPa。本研究表明，单斜晶HBO {dollar} sb2 {dollar}是氧化铝SLS以获得结构合理部件的潜在有用的无机粘合剂。将来也可能与其他陶瓷系统一起使用。

著录项

  • 作者

    Lee, In Sup.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Metallurgy.; Engineering Materials Science.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;工程材料学;机械、仪表工业;
  • 关键词

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