Conclusions
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1.
It has been established that the alloying of sintered Fe-CaF2 materials with molybdenum (15 wt.%) increases their hardness 2.5–8.6 times and raises their transverse rupture strength to 70–60 kg/mm2 and their compressive strength to 110–70 kg/mm2 at temperatures of up to 650°C.0
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2.
Raising the CaF2 content of sintered iron decreases its impact strength at temperatures of up to 650°C. It was found that for Fe6CaF2, Fe9CaF2, and Fe (porous) materials the variation of impact strength as a function of testing temperature is similar in character to that observed with cast Armco iron. The blue-brittleness range for sintered Fe-CaF2 materials extends from 350 to 450°C.
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3.
It is shown that the impact strength of sintered Fe15Mo6CaF2 material, unlike that of unalloyed materials, increases up to a temperature of 500°C as a result of migration of the molybdenum from the grain boundaries into the grains. In tests Fe15Mo6CaF2 material cracks by a brittle intergranular rupture mechanism.
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4.
Fe15Mo6CaF2 material surpasses in heat resistance all the other sintered CaF2-containing ironbase materials investigated, and can therefore be recommended for operation at temperatures of up to 650°C in friction units which do not experience severe shock loads.
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Translated from Poroshkovaya Metallurgiya, No. 3(159), pp. 96–101, March, 1976.
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Fedorchenko, I.M., Shevchuk, Y.F., Miroshnikov, V.N. et al. Elevated-temperature mechanical properties of sintered iron-base materials containing calcium fluoride additions. Powder Metall Met Ceram 15, 238–242 (1976). https://doi.org/10.1007/BF00806537
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DOI: https://doi.org/10.1007/BF00806537