Kulkarni, AG and Pai, BC and Balasubramanian, N (1979) Preparation of commercial grade boron nitride fibres. Technical Report. National Aeronautical Laboratory, Bangalore, India.
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Abstract
Commercial grade Boron nitride fibres of tensile strength13; 115 x 10 psi and tensile modulus 6 x 10 psi were prepared. The preparation of Boron nitride fibres involve three important steps: (1) preparation of Boric Oxide fibre (a precursor material) by directly drawing the fibers from the melt in a continuous form, (ii) Partial nitriding of the Boric Oxide fibres in an ammonia atmosphere under controlled conditions of heating in a batch process upto 1050xB0;C. (,iii) Complete conversion of the partially nitrided fibre into a commercial Boron nitride fibre. Parameters affecting the strength and modulus of the fibres are discussed at the each13; stage of the conversion by viewing the fibre surface under Scanning Electron Microscope, observing crystal structure change by X-ray analysis and mechanical properties by testing the individual fibres. These commercial grade BN fibres in the board form can find applications in chemical, electrical and other industries. Three uses of particular interest are: (1) as reinforcements in composites, (2) in high temperature insulation, and (3) for separation in high13; performance batteries.
| Item Type: | Monograph (Technical Report) |
|---|---|
| Uncontrolled Keywords: | Commercial grade;Tensile modulus;Boric oxide;Reinforcements;13; Insulation |
| Subjects: | CHEMISTRY AND MATERIALS > Inorganic, Organic and Physical Chemistry CHEMISTRY AND MATERIALS > Chemistry and Materials (General) |
| Depositing User: | M/S ICAST NAL |
| Date Deposited: | 21 Dec 2006 |
| Last Modified: | 24 May 2010 04:24 |
| URI: | http://nal-ir.nal.res.in/id/eprint/3813 |
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