Variation with temperature and porosity, of the moduli rupture and elasticity of standard isostatically pressed and sintered beryllia.

Abstract

Some properties of isostatically pressed and sintered UOX beryllia, fabricated at Lucas Heights to a grain size of ≤3μ were measured. The modulus of rupture of material of density 2.86 to 2.90 g cm-3 was measured in four-point bending over the temperature range 20ºC to 1000ºC. The data could be represented by the equation: σf = 33,000 - 7.46T p.s.i. The total variance was 19.5 x 10 6 p.s.i. made up of a "within" batch variance, of 15.8 x 10 6 p.s.i. and a "between" batch variance of 3.7 x 10 6 p.s.i. The modulus of rupture at 20ºC was measured on material with a total porosity range of 4 to 35 per cent; the data could be represented by the equation: σ = σ0 exp(-2.44P) p.s.i. The modulus of elasticity was measured in four-point bending on 97-5 per cent, dense material and the data could be represented by the equation: E = (51.45 x 10 6)+(l.264x10 2 T)-(1.442+10-1T2)-(2.595x10-3T3) p.s.i. The modulus of elasticity was measured as a function of porosity in the range 2 to 36.4 per cent. The data could be represented by the equations E = Eo (1-1.47P) x 10 6 p.s.i