▎ 摘　　要

NOVELTY - Preparation of self-lubricating cutter involves (i) adding graphene and calcium fluoride into ethanol, and mechanically stirring to obtain a graphene/calcium fluoride suspension, (ii) adding aqueous ammonia to graphene/calcium fluoride suspension, heating, dripping ethyl orthosilicate until the solution appears bluish, dripping ethyl orthosilicate, reacting and vacuum-drying precipitate in the test tube to obtain silica-wrapped graphene/calcium fluoride particle powder, (iii) adding silica-wrapped graphene/calcium fluoride particles, titanium carbide, magnesium oxide, alumina to ethanol for ultrasonic dispersion to obtain suspended mixture, and ball-milling the mixture and vacuum-drying to obtain mixed powder, (iv) adding molding agent to the mixed powder, compression molding, sintering, and (v) cooling down to room temperature, and polishing. USE - Preparation method of self-lubricating cutter used for cutting various alloys and metals. ADVANTAGE - The method provides self-lubricating cutter with good thermal conductivity and wide temperature range. The cutter has good heat-conducting performance and wide-temperature-domain self lubricating performance. DETAILED DESCRIPTION - Preparation of self-lubricating cutter involves (i) adding graphene and calcium fluoride into ethanol according to the ratio of 1:0.2-1:0.8, and mechanically stirring at a speed of 1000-2500 rpm and temperature of 60-90degrees Celsius for 8-12 hours to obtain a graphene/calcium fluoride suspension, (ii) adding aqueous ammonia to 100-500 ml graphene/calcium fluoride suspension to adjust the pH value to 8-9, heating up to 50-95degrees Celsius at a stirring speed of 450-800 rpm, dripping ethyl orthosilicate until the solution appears bluish, dripping ethyl orthosilicate, reacting for 4-24 hours, and vacuum-drying precipitate in the test tube at 10000-13000 rpm and at 40-80degrees Celsius to obtain silica-wrapped graphene/calcium fluoride particle powder, (iii) adding 2-30 %mass silica-wrapped graphene/calcium fluoride particles, 5-75 %mass titanium carbide, 0.2-10 %mass magnesium oxide, 10-80 %mass alumina to ethanol for ultrasonic dispersion to obtain suspended mixture, and ball-milling the mixture for 36-48 hours, and vacuum-drying at 50-80degrees Celsius to obtain mixed powder, (iv) adding 0.2-1 %mass molding agent to the mixed powder, compression molding in a mold, sintering at high temperature of 1000-1500degrees Celsius at a heating rate of 10-20degrees Celsius/minute and maintaining for 10-70 minutes, and (v) cooling down to room temperature of 25-30degrees Celsius, and using a polishing machine to polish.