Preparation of the Boron Nitride Fibers by Chemical Reaction
In this study, boron nitride (BN) fibers were prepared via chemical method using boric acid as the raw material, under the atmosphere of NH3 and N2, respectively. Firstly, the boric acid was heated to melt in order to acquire B2O3 fibers. Secondly, the B2O3 fibers were pre-azotized under a NH3 atmosphere and held for 1 h at 970°C, and the sample was then sintered in N2 to the temperature of 2000°C and held for 1 h. The obtained samples were texted to analyze nitrogen content, morphology, tensile strength, and elastic modulus by neutralization titration, SEM, XRD and so on. The results show that the diameter of the BN fibers is ~ 4-6 μm with the nitrogen content of 54%, tensile strength of 1400 MPa, and elastic modulus of 120 GPa.
Takashi Goto, Yibing Cheng, Zhengyi Fu and Lianmeng Zhang
Z. Q. Cheng et al., "Preparation of the Boron Nitride Fibers by Chemical Reaction", Advanced Materials Research, Vol. 66, pp. 191-193, 2009