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THERMAL STABILITY OF NEXTEL 720 ALUMINO SILICATE FIBERS

机译：NEXTEL 720铝硅酸盐纤维的热稳定性

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摘要

Polycrystalline 3M Nextel 720 alumino silicate fibers (≈ 85 wt.% Al_2O_3, = 15 wt.% SiO_2, diameter: = 12 μm) consisting of 70 wt.% mullite and 30 wt.% α-Al_2O_3 were characterized mechanically and microstructurally.rnThe fibers were annealed at temperatures up to 1500℃ in air, either in a laboratory furnace or directly in the furnace of the tensile strength testing equipment. After this heat-treatment, tensile strength of the fibers was measured at room temperature with two different fiber gauge lengths, 5 mm and 100 mm (designated as F5 and F100 fibers), respectively.rnHeat treatment at 1200℃ leads to a fiber strength decrease to ≈ 85% of the starting value, probably due to locally starting α-Al_2O_3 and mullite grain growth processes. Annealing the fibers at 1200 and up to 1350℃ shows that strength decrease to ≈ 35% can be directly correlated with gradual grain growth and recrystallization effects as determined by transmission electron microscopy.rnAbove 1350℃, the short (F5) and long (F100) fibers behave differently: While F5 fiber still displays grain growth controlled strength reduction (≈ 40% of the starting value at 1500℃), the F100 exhibits drastic fiber strength loss between 1350 and 1400℃. Obviously, degradation of the F100 fibers is caused by the occurrence of critical defects in an average distance far beyond the length of F5 fibers (＞＞ 5 mm). This is possibly due to critical defects formed at processing-induced locally inhomogeneous fiber areas.
机译：通过机械和微观结构表征了由70重量％的莫来石和30重量％的α-Al_2O_3组成的多晶3M Nextel 720铝硅酸盐纤维（≈85 wt。％Al_2O_3，= 15 wt。％SiO_2，直径：= 12μm）。将纤维在空气中（最高温度为1500℃）在实验室炉中或直接在拉伸强度测试设备的炉中进行退火。进行此热处理后，在室温下分别用两种不同的纤维规格长度（分别为5 mm和100 mm）（称为F5和F100纤维）测量纤维的拉伸强度。rn在1200℃进行热处理会降低纤维强度大约是起始值的85％，这可能是由于局部启动了α-Al_2O_3和莫来石晶粒生长过程所致。对纤维进行1200℃和1350℃以下的退火处理表明，强度降低到≈35％可以​​与透射电子显微镜确定的逐渐晶粒长大和再结晶效果直接相关。rn在1350℃以上，短（F5）和长（F100）纤维的行为有所不同：尽管F5纤维仍显示出晶粒生长控制的强度降低（在1500℃时约为起始值的40％），但F100在1350至1400℃之间表现出急剧的纤维强度损失。显然，F100纤维的降解是由严重缺陷的出现引起的，该缺陷的平均距离远超过F5纤维的长度（＞＞ 5 mm）。这可能是由于在加工引起的局部不均匀纤维区域形成的严重缺陷。

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  • 来源
  • 会议地点 Berkeley CA(US)
  • 作者

    H. Schneider; J. Goering; M. Schmuecker; F. Flucht;

  • 作者单位

    Institute for Materials Research German Aerospace Research Establishment 51140 Koeln, Germany;

    Institute for Materials Research German Aerospace Research Establishment 51140 Koeln, Germany;

    Institute for Materials Research German Aerospace Research Establishment 51140 Koeln, Germany;

    Institute for Materials Research German Aerospace Research Establishment 51140 Koeln, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TQ174.01;
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