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Hot-pressing preparation method for hexagonal boron nitride-added silicon nitride
The invention relates to a hot-pressing preparation method for hexagonal boron nitride-added silicon nitride. The preparation method comprises the following steps: adding hexagonal boron nitride having a laminar structure as a solid lubricating agent to silicon nitride, and mixing; meanwhile, adding a sintering aid and carrying out ball grinding; pouring alcohol to adjust the viscosity of fluid; then putting the ball-ground powder to a drying oven, heating, drying by steaming and sieving; then loading the powder to a die, and pre-pressing to form a biscuit; carrying out temperature preservation and pressure preservation in a vacuum carbon tube furnace; finally, reducing the temperature of the vacuum carbon tube furnace to room temperature, and taking sintered silicon nitride composite ceramic out. According to the preparation method disclosed by the invention, boron-containing oxides and hydroxides are generated by means of a chemical reaction between the hexagonal boron nitride and water molecules, so that the siding surface of a material has a lubricating property per se, and thus the tribological property of the silicon nitride ceramic material is remarkably improved, namely the friction factor of the silicon nitride ceramic material is remarkably reduced; the silicon nitride composite ceramic produced by hot-pressing sintering has the characteristics of good self-lubricating and tribological properties and can meet the using demands in actual engineering.
Hot-pressing preparation method for hexagonal boron nitride-added silicon nitride
The invention relates to a hot-pressing preparation method for hexagonal boron nitride-added silicon nitride. The preparation method comprises the following steps: adding hexagonal boron nitride having a laminar structure as a solid lubricating agent to silicon nitride, and mixing; meanwhile, adding a sintering aid and carrying out ball grinding; pouring alcohol to adjust the viscosity of fluid; then putting the ball-ground powder to a drying oven, heating, drying by steaming and sieving; then loading the powder to a die, and pre-pressing to form a biscuit; carrying out temperature preservation and pressure preservation in a vacuum carbon tube furnace; finally, reducing the temperature of the vacuum carbon tube furnace to room temperature, and taking sintered silicon nitride composite ceramic out. According to the preparation method disclosed by the invention, boron-containing oxides and hydroxides are generated by means of a chemical reaction between the hexagonal boron nitride and water molecules, so that the siding surface of a material has a lubricating property per se, and thus the tribological property of the silicon nitride ceramic material is remarkably improved, namely the friction factor of the silicon nitride ceramic material is remarkably reduced; the silicon nitride composite ceramic produced by hot-pressing sintering has the characteristics of good self-lubricating and tribological properties and can meet the using demands in actual engineering.
Hot-pressing preparation method for hexagonal boron nitride-added silicon nitride
CHEN WEI (author) / LYU ZHENGLIN (author)
2015-11-11
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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