Bombonatti P E, de Barros L E, Scaranelo R M, Pellizzer A J
Faculdade de Odontologia do Campus de Aracatuba, UNESP.
Rev Odontol UNESP. 1990;19(1):203-9.
Being the surface roughness a fundamental property in the fit of the castings, it was determined the roughness of 5 high-copper casting alloys, according to the heating over their melting temperature. That way, the specimens made with smooth plastic in the shape of a rectangular plate, 2 mm x 7 mm x 11 mm were invested into a cristobalite investment. After heating and elimination on the plastic, the molds were filled by 3 g of molten alloy, casted in a electrical casting machine at the casting temperature at 25 degrees C and 50 degrees C overheating. The surface roughness was measured in a roughness analyser, Talysurf. As a result, it was verified that there is a variation of surface roughness among the alloys tested, and the heating of the alloys until 50 degrees C over the melting temperature does not interfere in the roughness.
由于表面粗糙度是铸件配合的一项基本特性，根据5种高铜铸造合金在超过其熔化温度时的加热情况，测定了它们的粗糙度。具体做法是，将由光滑塑料制成的2毫米×7毫米×11毫米矩形板形状的试样包埋在方石英包埋料中。去除塑料并加热后，用3克熔融合金填充模具，在铸温为高于熔点25℃和50℃过热度的情况下，在电动铸造机中铸造。使用Talysurf粗糙度分析仪测量表面粗糙度。结果表明，在所测试的合金中表面粗糙度存在差异，并且将合金加热至超过熔化温度50℃不会影响粗糙度。
