[Chemical composition] MgO 31.72%, SiO2 63.52%, H2O 4.76%. It also often contains FeO, up to 2-5%. Further, it also contains Al, Mn, Ca, and Ni.
[Form] Monoclinic system. Crystals are rare, often in the form of flaky scaly or dense block aggregates.
[Physical properties] White, but often with light green, light brown, light yellow and other colors. Glass luster, dense block often with waxy luster, with pearl luster inside. Hardness 1. Slip cleavage sheet is flexible. The proportion is 2.7-2.8.
[Genesis and occurrence] Talc is mainly formed by hydrothermal alteration of magnesium- rich rocks such as ultrabasic rocks and dolomite . The olivine in the ultrabasic rocks and the dolomite in the dolomite can form talc by hydrothermal alteration.
4(Mg,Fe) 2 (SiO 4 )+H 2 O+CO 2 →Mg 3 [Si 4 O 10 ](OH) 2 +Mg[CO 3 ]+Fe 2 O 3
Olivine talc magnesite
3CaMg[CO 3 ] 2 +4SiO 2 +H 2 O→Mg 3 [Si 4 O 10 ](OH) 2 +3Ca[CO 3 ]+CO 2
Dolomite talc calcite
In addition, talc, such as talc schist, can also be formed during regional metamorphism.
[Identification Features] Features low hardness, slipperiness, light color, flake shape, and a set of extremely complete cleavage.
High temperature alloy is divided into three kinds of material: 760 ℃ high-temperature material, 1200℃ high temperature and 1500 ℃ high temperature materials, the tensile strength is 800 mpa. On other words,it refers to the metal material worked well in the condition of 760-1500 ℃ or above. It owns excellent high temperature strength, good resistance to oxidation and thermal corrosion resistance, good fatigue properties, fracture toughness and other comprehensive performance, this kind of material has became an irreplaceable key material in military and civilian gas turbine engine hot end components . According to the relevant theory, 760 ℃ high-temperature materials, according to the matrix elements,can be mainly divided into high temperature iron base alloy, nickel base superalloy and cobalt-based super alloy. According to the preparation process,it can be divided into deformation and high temperature alloy, casting high temperature alloy and powder metallurgy super alloy. According to the solid methods,it can be divided into solid solution strengthening, precipitation strengthening and oxide dispersion strengthened with fiber reinforced type, etc.
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