Thermomechanical properties of ceramics from lanthanum chromite modified with calcium

The technology of preparing dense ceramics from Lasub(0.95)Casub(0.05)CrOsub(3) is described; its thermomechanical properties are studied. The temperature dependences of the cross-breaking strength and the static elasticity modulus are studied. The cross-breaking strength and the elasticity modulus at room temperature are 77 MPA and 1.5x105 MPa, respectively. Temperature increase results in the abrupt reduction of these values, the minimum is registered in the interval of 300-450 deg C. The curves of thermal expansion in the temperature range of 20-1000 deg C in the oxidizing medium are registered, thermal resistance according to the cross-breaking strength loss after 1.2 and 3 ''1000 deg - air'' heat changes is 40, 55, 61%, respectively. Dense ceramics creep after 3-hour calcination is studied. The obtained dependences have a bend at the temperature of 1600 deg C. It is established that the behaviour of the material at high temperature is connected with modification transitions is the compound lattice