期刊
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
卷 18, 期 1, 页码 32-39出版社
WILEY
DOI: 10.1111/ijac.13615
关键词
boron carbide; composite powder; sol gel synthesis; titanium diboride
资金
- Materials and energy research center [282950]
Composite powders containing titanium diboride and boron carbide were prepared by the sol-gel method under different conditions, and the structure and phases were studied. With increasing boron oxide content, unwanted phases decrease, providing important references for the synthesis of composite powders.
Composite powders containing titanium diboride and boron carbide have been prepared by sol-gel method at 1450 degrees C using titanium isopropoxide (titanium precursor), boric acid (Boron precursor), sucrose (carbon source), and acetic acid (AcOH) as a solvent. The effect of boron source (trimethyl borate and boric acid) and B2O3/TiO2, C/B(2)O(3)mole ratios of starting materials on the final phases has been studied. The progress of reactions was determined using thermal analysis (TGA-DTA). The resultant powders were characterized by X-ray diffraction (XRD) analysis and field-emission scanning electron microscope (FESEM). XRD patterns confirmed the formation of TiB2, B4C, and TiC phases after heat treatment at 1450 degrees C at mole ratio of B2O3/TiO2 = 4.5, C/B2O3 = 2.4. With increasing the content of boron oxide, the unwanted phases such as TiC and C were reduced. TiB(2)and B4C composite powders (similar to 5 mu m diameter) containing residual carbon (<4 wt%) were synthesized using the mole ratio of B2O3/TiO2 = 10 and C/B2O3 = 1.9 at low temperature of 1450 degrees C.
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