期刊
NEW SPACE-THE JOURNAL OF SPACE ENTREPRENEURSHIP AND INNOVATION
卷 7, 期 1, 页码 43-55出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/space.2018.0036
关键词
sapphire; laser ablation; extreme environments; Bayesian statistics
资金
- FAA Commercial Space Transport (CST) Center of Excellence
The robust material properties of sapphire across a large temperature range make it an ideal material for pressure sensing at extreme temperatures; however, it is difficult to machine and requires specialized processes, such as laser ablation. Sapphire's thermomechanical properties are investigated to understand the influence of picosecond pulsed laser ablation processes on the elastic modulus and strength for temperatures ranging from room temperature to 1,300 degrees C. Single crystal sapphire cut on the r-plane is tested using four-point bend bar specimens where thermomechanical properties in the as-received state are compared with properties after specimens are milled in the center region by the laser. Optical microscopy illustrates strong changes in the birefringence in the laser-machined region. Laser ablation results in a modulus reduction across all three temperatures tested while the strength increases. The modulus of laser-ablated sapphire is shown to be more resistant to temperature changes when operating below 950 degrees C. The variability in strength also increased in the laser ablation specimens, which is promising for pressure sensor reliability. Bayesian statistics was used to assess differences in the elastic and strength properties as a function of both temperature and laser machining processes.
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