Produce ß-SiAlON ceramics, alloy MgO and MgF2, and examine cutting ends of performance

Keywords: Si3N4, ß-SiAlON, Liquid Phase Sintering, Magnesium FluorideSi3N4 based SiAlON ceramics are obtained by respectively replacing silicon and nitrogen in Si3N4 by aluminium and oxygen. SiAlON ceramics offer advantages of easier fabrication compared with Si3N4 ceramics because of the lower viscosity and melting temperature of the liquid phase (LP) which facilitates easier densification at sintering temperatures. Another advantage is that the amount of intergranular phase can be reduced because the transient liquid phase can be absorbed into the matrix phase(s)In this study, MgF2 was added into composition instead of using MgO additive to reduce (100-200 °C) sintering temperature for production of ß-SiAlON ceramics. MgO is one of the well known sintering additives for Si3N4 powders. Fluorine as a non-bridging anion in glasses acts as a powerful network disrupter which oxygen ions. Thus, full dense ß-SiAlON materials can be produced at lower temperature which means time and energy savings.This study were produced sintering b-SiAlON ceramics,alloy MgO and MgF2 as a systematic method of pressureless sintering from 1450 to 1750 °C in the range 0.5 to 2.5 hour periods in the form of cutting ends made of sintering.Production of cutting the ends of the density, SEM,XRD,EDS and characteristics such as hardness, mechanical properties such as fracture toughness were examined.ß-SiAlON, alloy MgO and MgF2, cutting the ends processing performance were compared with toughened AISI 4140 steel and ß-SiAlON cutting ends of market,according to the ends of WC is used for cutting steel cutting performance were examined.