4.4 Article

Formation and Impact of Microcracks in Plasma Erosion of M26 Boron Nitride

期刊

JOURNAL OF PROPULSION AND POWER
卷 37, 期 1, 页码 59-67

出版社

AMER INST AERONAUTICS ASTRONAUTICS
DOI: 10.2514/1.B37948

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资金

  1. U.S. Air Force Office of Scientific Research [FA9550-16-1-0341]
  2. National Science Foundation Graduate Research Fellowship [DGE-1650044]
  3. Achievement Award for College Scientists - Siemens
  4. Georgia Tech Institute for Materials Graduate Student Fellowship - BASF Corporation
  5. National Science Foundation [ECCS-1542174]

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This study quantified the formation and growth of microcracks on the surface of M26 grade boron nitride composite due to thermal shock, and evaluated their impact on plasma erosion. The results showed that the ratio of crack area to total area increased with thermal cycling, but microcracks did not significantly affect surface composition or feature development.
This Paper investigates the role of microcracks in Hall thruster wall erosion. The formation and growth of microcracks on the surface of M26 grade boron nitride composite due to repeated thermal shock was quantified, and the subsequent impact of microcracks on plasma erosion was assessed. Thermal shock cycles (20 -> 800 -> 20 degrees C) were provided by a radiation oven to induce thermal stresses similar to those incurred by a Hall thruster wall. The average ratio of crack area to total area was observed to grow as a power law with subunity exponential from 4-5% before thermal cycling to 15-18% after 20 thermal shock cycles. Cycled and control samples were simultaneously exposed to argon plasma with average ion energy of 130 eV. All samples were observed to preferentially retain boron nitride relative to silica, and microcracks were not observed to significantly impact surface composition or feature development.

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