EFFECT OF MOISTURE CONTROL OF GREEN BODIE S IN CIP ON THE CHARACTERISTICS OF SINTERED ALUMINA CERAMICS

The effect of moisture content in green bodies in CIP on properties of green and sintered bodies of alumina ceramics was studied in a two-st ep forming process consisting of die-pressing and CIPing. Alumina gran ules of a constant moisture content were die-pressed to green bodies a nd their moisture content was adjusted to 0.4-2.0 mass%. Then, they we re CIPed at 120 MPa and sintered at 1600-degrees-C for 2h. Their struc tures and fracture strength were examined with an SEM, an optical micr oscope of transmission mode and a universal testing machine. The moist ure content of green bodies in CIP significantly affected properties o f green and sintered bodies. With increasing moisture content in green bodies in CIP, the density and bending strength of green and sintered bodies increased. The Weibull modulus of sintered bodies increased wi th increasing moisture content in green bodies in CIP.