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首页> 外文学位 >Elastic-plastic behavior of hot-pressed composite titanium diboride/alumina powders produced using self-propagating high-temperature synthesis.
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Elastic-plastic behavior of hot-pressed composite titanium diboride/alumina powders produced using self-propagating high-temperature synthesis.

机译：使用自蔓延高温合成法生产的热压复合二硼化钛/氧化铝粉末的弹塑性行为。

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摘要

Advanced technologies for the synthesis and processing of ceramic materials are being developed to provide a route to lower manufacturing costs and increased reliability. Self-propagating high temperature synthesis (SHS) has been shown to be a feasible, potentially low cost technology to synthesize and form refractory ceramic materials such as titanium diboride and composite titanium diboride/alumina powders.; High strain rate impact tests on ceramic armor materials; titanium diboride (TiB{dollar}sb2{dollar}), silicon carbide (SiC), boron carbide (B{dollar}sb4{dollar}C), and alumina (Al{dollar}sb2{dollar}O{dollar}sb3{dollar}) have shown excellent resistance to penetration when compared with conventional rolled homogeneous metal armor (RHA).; The objective of this research was to determine if the static and dynamic properties of hot pressed powders produced using self-propagating high temperature synthesis (SHS) were competitive with the properties of hot pressed powders produced using conventional technologies. Further, it was an objective to determine the effects of projectile/target erosion, thermal and strain-rate phenomena on ceramic target penetration resistance.; The above objectives were accomplished by determining the elastic and plastic (inelastic) properties of hot pressed titanium diboride (TiB{dollar}sb2{dollar}) and composite titanium diboride/alumina (TiB{dollar}sb2{dollar}/Al{dollar}sb2{dollar}O{dollar}sb3{dollar}) powders produced using SHS technology. The results were compared to hot pressed, conventionally produced powders of carbothermic TiB{dollar}sb2{dollar}, polycrystalline Al{dollar}sb2{dollar}O{dollar}sb3{dollar}, and carbothermic TiB{dollar}sb2{dollar} manually mixed with polycrystalline Al{dollar}sb2{dollar}O{dollar}sb3{dollar}.; Quasi-static and dynamic properties were documented: and ballistic tests were conducted. Material properties were documented before and after the static and dynamic tests. Test results and material failure mechanisms were documented, analyzed and compared with reported values of TiB{dollar}sb2{dollar}, SiC, B{dollar}sb4{dollar}C and Al{dollar}sb2{dollar}O{dollar}sb3{dollar}. Resistance to penetration behavior was determined using Tate's model and Yatteu's relationships.; Results showed that static and dynamic behavior of materials produced using SHS technology exhibited properties that were as good as, or superior to, properties of materials produced using conventional processing technologies. The composite titanium diboride/alumina exhibited excellent resistance to high velocity penetration as compared with other ceramic armor materials. Thermal effects were not significant since the temperatures generated by penetration were approximately 300-500K. Strain-rate was significant since compressive strength increased as strain rate increased.
机译：正在开发用于陶瓷材料合成和加工的先进技术，以提供降低制造成本和提高可靠性的途径。自蔓延高温合成（SHS）已被证明是一种可行的，潜在的低成本技术，用于合成和形成耐火陶瓷材料，例如二硼化钛和二硼化钛/氧化铝复合粉末。对陶瓷铠装材料的高应变率冲击测试；二硼化钛（TiB {dollar} sb2 {dollar}），碳化硅（SiC），碳化硼（B {dollar} sb4 {dollar} C）和氧化铝（Al {dollar} sb2 {dollar} O {dollar} sb3 {与传统的轧制均质金属铠装（RHA）相比，已显示出极好的抗穿透性。这项研究的目的是确定使用自蔓延高温合成（SHS）生产的热压粉末的静态和动态性能是否与使用常规技术生产的热压粉末的性能相竞争。此外，目的是确定弹丸/靶材的侵蚀，热和应变率现象对陶瓷靶材的抗穿透性的影响。通过确定热压二硼化钛（TiB {dollar} sb2 {dollar}）和复合二硼化钛/氧化铝（TiB {dollar} sb2 {dollar} / Al {dollar}的弹性和塑性（非弹性）性能来实现上述目标。使用SHS技术生产的sb2 {dollar} O {dollar} sb3 {dollar}）粉末。将结果与热压，常规生产的碳热TiB {dollar} sb2 {dollar}，多晶Al {dollar} sb2 {dollar} O {dollar} sb3 {dollar}和carbothermic TiB {dollar} sb2 {dollar}的粉末进行比较手动与多晶Al {dol} sb2 {dol}} O {dol} sb3 {dol}混合。记录了准静态和动态特性：并进行了弹道测试。在静态和动态测试之前和之后记录材料属性。测试结果和材料破坏机理被记录，分析并与报告的TiB {dollarssb2 {dollar}，SiC，B {dollar} sb4 {dollar} C和Al {dollar} sb2 {dollar} O {dollar} sb3的值进行比较和比较。 {美元}。使用Tate模型和Yatteu关系确定对渗透行为的抵抗力。结果表明，使用SHS技术生产的材料的静态和动态行为表现出的性能与使用常规加工技术生产的材料的性能相同或更好。与其他陶瓷铠装材料相比，二硼化钛/氧化铝复合材料对高速渗透具有出色的抵抗力。由于渗透产生的温度约为300-500K，因此热效应并不明显。应变速率很重要，因为抗压强度随应变速率的增加而增加。

著录项

  • 作者

    Logan, Kathryn Vance.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1992
  • 页码 227 p.
  • 总页数 227
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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