Effect of pyrolysis atmosphere on preparation of boron carbide from boric acid glycerin
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The effect of different atmosphere on the particle size and morphology of the B4C was studied by using organic precursormethod of low temperature pyrolysis with glycerol borate condensate as raw material. The same mole of boric acid andglycerol were directly mixed, and the condensed product was prepared by dehydration condensation. The precursor powderwas pyrolyzed in still air(a), air flow(b), nitrogen flow(c) and argon flow(d) respectively to get rid of excess carbon. Theprecursors all have a three-dimensional continuous B2O3/carbon network structure, in which the pore size of the carbonnetwork in the static air flow is about 1um, and the pore size of the carbon network in the air flow is about 0.1 um. Theinfluence of the other two gases on the pore size structure of the carbon network is between the static air and the air flow. The morphology and size of B4C powders produced by different synthetic routes (a, b, c, d) were polygonal with 5.7 um,smooth granular with 1.5 um, flake and rod-shaped particles with 14.0 um, and hexagonal with 23.3 um, respectively. Thispaper is the first time to study the effect of pyrolysis atmosphere on the morphology control of boron carbide from themolecular level.
Abstract
The effect of different atmosphere on the particle size and morphology of the B4C was studied by using organic precursormethod of low temperature pyrolysis with glycerol borate condensate as raw material. The same mole of boric acid andglycerol were directly mixed, and the condensed product was prepared by dehydration condensation. The precursor powderwas pyrolyzed in still air(a), air flow(b), nitrogen flow(c) and argon flow(d) respectively to get rid of excess carbon. Theprecursors all have a three-dimensional continuous B2O3/carbon network structure, in which the pore size of the carbonnetwork in the static air flow is about 1um, and the pore size of the carbon network in the air flow is about 0.1 um. Theinfluence of the other two gases on the pore size structure of the carbon network is between the static air and the air flow. The morphology and size of B4C powders produced by different synthetic routes (a, b, c, d) were polygonal with 5.7 um,smooth granular with 1.5 um, flake and rod-shaped particles with 14.0 um, and hexagonal with 23.3 um, respectively. Thispaper is the first time to study the effect of pyrolysis atmosphere on the morphology control of boron carbide from themolecular level.
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