The Research On Friction And Wear And Mechanical Properties Of Hybrid Sintering Of Glass-ceramics

The glass-ceramic has high mechanical properties, wear resistance and chemical stability in the fields of construction, electronics, aerospace, medical. In recent years, researchers focused on the glass-ceramic in terms of impact on the structure and properties of the grain size, sintering processes. Friction and wear areas of the glass ceramic is relatively small. At present,sintering rule rarely used. In this paper, the preparation of Ca O-Al2O3-Si O2 system glass ceramics using mixed sintering method, and carries on the analysis of friction and wear properties and mechanical properties, so as to provide a theoretical basis for the development and application of glass ceramic friction field.At different speeds, loads of Ca O-Al2O3-Si O2-based glass ceramic friction and wear testing, analysis speed, load, time effect on the friction and wear properties. By changing the Ca O and the content of Al2O3, Ca O and Al2O3 analysis on friction and wear properties. Through sintering test and mechanical properties test, volume density, the volume density of glass powder, Ca O, sintering temperature, sintering time, sintering rate, particle size and other factors on the glass ceramics and the influence of the bending strength of glass ceramics, and explore the best bending strength. The main results of the research are as follows.With the long time of glass ceramic friction and wear, the main form of wear are plowing wear and fatigue wear.At high speed and high load,adhesive wear occurs. When the load and speed increases, glass ceramics furrows increased wear and fatigue wear.Under different load, the friction coefficient Ca O-Al2O3-Si O2-based glass ceramics with increasing time the overall trend showed increases. Under different loads, the amount of wear of the glass ceramic increases as time increases. In the latter part of the friction and wear, the wear amount and the rate of increase of the friction coefficient of the glass-ceramic gradually increases as the load increases. At high speed, the friction coefficient of the glass ceramic increases with decreasing sliding stroke after the first increase in the last added. At low speed, the increased friction coefficient increases with sliding glass ceramics to reduce travel. Both speed increase the amount of wear with sliding stroke increasing.The size of glass ceramics with different Ca O and Al2O3 contents in the β-Ca Si O3 and quantity change leads to changes of hardness and mechanical strength, and result in hardness and mechanical strength, thereby affecting the friction coefficient and wear amount. Different Ca O and Al2O3 content of the glass-ceramic, the friction coefficient with increasing time at first and then increase to reduce and finally rising trend, both as time increases gradually increase the amount of wear.With the increase of Ca O content, the average friction coefficient of the glass ceramic, the final amount of wear, fatigue wear period the amount of wear and increase the rate of increase of the magnitude of the coefficient of friction are showing an increasing trend lower after the first. With the increase of Al2O3 content, the average friction coefficient of the glass ceramic, the final amount of wear, fatigue wear of the wear rate of increase and the rate of increase during the friction coefficient are showing an increasing trend lower after the first.Different Ca O,Al2O3 content in the form of wear glass ceramics are mainly plowing wear, fatigue wear. Fatigue wear depends on the size of the mechanical strength, while lower hardness can exacerbate fatigue wear.The bending strength of glass ceramics with sintering temperature, particle size, heating rate of increase are showing decreased after the first increase. When the process as follows: the content of glass powder 60%,Ca O content of 12%, particle size 120 mesh, heating rate 30℃/ min, the sintering temperature 1000℃, sintering time 90 min, the flexural strength of the glass ceramic reaches a maximum.