섬유

method for strengthening boron fibers. patent application

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 328
commercially available boron filters, produced by the chemical vapor deposition of boron onto tungsten wire substrates, are strengthened by treating them in an oxygen plus inert gas (argon) containing atmosphere for a few minutes at about 880 c. high temperature oxidation increases the residual compression on the tungsten core because the fiber contracts axially during formation of a thin boron oxide coating on the fiber surface. this increases the intrinsic strength of the fiber by raising the tensile strength level required for core initiated fracture. after cooling to room temperature, the fibers are chemically polished to reduce their diameters by 0.2 mils to 0.5 mils. the chemical polish removes both original and oxidation induced surface flaws. the strengthened fibers are intended to be utilized as reinforcement in composite materials. such materials may be boron/aluminum or boron/epoxy
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