Tribology Of Si3n4 Ceramics Depending On Amount Of Added Sio2 Nanocolloid

We analyzed the wear characterization of Si3N4 ceramics according to the amount of added SiO2 nanocolloid. The test specimen was prepared by hot-press sintering at 35 MPa and 2123 K in an N-2 gas atmosphere for 1 h. A wear test was performed with a block-on-ring tester, and the test conditions were as follows: (1) the ring with a diameter of 35 mm had a rotational speed of 50 rpm; (2) the load was 9.8 N; and (3) the temperature was 25 degrees C. The test results show that Si3N4 ceramics have a friction coefficient of about 1.0 and a wear loss of about 0.02 mm. Of the specimens used this study, the test specimen with 1.3 wt% of added SiO2 nanocolloid has the best wear resistance because it has the lowest friction coefficient and the smallest wear loss. This specimen also has the highest Vickers hardness and bending strength. In this study, the friction coefficient is inversely proportional to the hardness and bending strength.