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        Physical and chemical properties of elements

        1. Physical properties

        Volume density

        Bend strength

        Vickers-hadness

        Porosity rate

        Water absortion

        Hot extnsiblity

        5.5~5.6kg/cm3

        15-25kg/cm2

        (HG)570kg/mm2

        7.4%

        1.2%

        4%

        2. Chemical properties

           Oxygen-resistance under high temperature: in the oxidizing atmosphere , a layer of compact quartz (SiO2) protective film is formed on the surface of element owing to the high-temperature combustion, which prevent MoSi2 from continuously oxidizing. When the element temperature is higher than 1700℃,the SiO2 protective film will be fused because its fusing point is1710℃ and the SiO2 is fused into molten dropa owing to the action of its surface extension, which cause losing its protective ability. In the oxidizing atmosphere, when the element is continuously used, the protective film forms again.

          It should be pointed out that element cannot be used for rather long time in 400-700℃,otherwise it will be powdered owing to the strong oxidizing action in low temperature.

        3.The Max temperature of elements in different atmospheres

        Atmosphere

        Max element temperature

        Songshan Super MS17

        Songshan Super MS18

        Air

        1700℃

        1800℃

        Nitrogen

        1600℃

        1700℃

        Argon,Helium

        1600℃

        1700℃

        Hydrogen

        1100~1450℃

        1100~1450℃

        N2/H2 95/5%

        1250~1600℃

        1250~1600℃

        General applications

        Most types of industrial furnace for heat treatment ,forgoing, sintering, glass melting and refining and for use in radiant tubes

        Laboratory furnaces, testing equipment and high temperature sintering production furnace