Sintering method of SiC ceramic for bulletproof plate

Requirements for sintering method of bulletproof board silicon carbide ceramics:
The invention relates to a sintering method of silicon carbide ceramic for integral bulletproof insert plate, which is characterized in that the pre sintering steps are as follows: the blank body is installed on the furnace bottom plate in the vacuum sintering furnace, the furnace door is closed, the temperature is raised to 900 ± 50 ℃ under the action of the induced draft fan to discharge the glue, and the blank body is cooled and taken out;

The process of making silicon plate: use 80-200 mesh fine silicon powder to press silicon plate in the mould of pressing bulletproof insert plate; the weight of silicon plate is 70% of the weight of blank body;

Charging steps: put the graphite bottom plate on the furnace plate, put the rubber discharged blank body on the graphite bottom plate, put the silicon plate on the blank body, and then put a silicon plate on each blank body, a stack of 6 blank bodies, 6 silicon plates, and fill the furnace;

High temperature sintering steps: under vacuum, adopt nitrogen protection to rise to high temperature and stop heating, continue vacuumizing and stop vacuumizing, fill nitrogen into the furnace body to form a micro negative pressure state, open the furnace door after cooling, and then take it out after natural cooling to get the finished product; when heating up, the vacuum degree is 25Pa; when heating up, the temperature is 1800 ℃; the micro negative pressure state is 700pa-800pa; when cooling to 300 ℃, open the furnace door.