The influence of different single filling materials and the mixture of the two different filling materials on the coefficient of thermal expansion of the external layer and structure layer of compound artificial marble have been studied.The results show that when the external layer is packed with single filling materials,the filling materials with different size have different effects.When the filling materials are mixed with the resin with the ratio of 2 ∶1 and CaCO3 of 200 meshes are packed,the coefficient of thermal expansion is the smallest of all single filling materials,the value of which is 2.3×10-5/℃.The effect of the compound of two different filling materials is better than the single ones.When CaCO3 of 200 meshes are mixed with color sands of 80～120 meshes by the ratio of 2 ∶1,the coefficient of thermal expansion is smaller than any other compound padding,the value of which is 1.85×10-5/℃.When the single filling materials of polystyrene grain peanut shell grain are packed in...更多 the structure layer,the coefficient of thermal expansion to the structure layer can reach 2.0×10-5/℃,as in the case where.When polystyrene grain of 1.7 percent or peanut shell grain of 10 percents are packed.It matches to the coefficient of the external layer.When the compound padding is selected,fixing the polystyrene grain at 35 percent,the coefficient of the thermal expansion to the structure layer can reach 2.0×10-5/℃ with the peanut shell grain of 9 percent.The flaw is caused by the single padding is inhibited,which might be due to the coordination effect.
