Sökning: "MoSi2 Mo5Si3 Oxidation High Temperature Heating element"
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1. Maximum element temperature for Kanthal Super 1800S in flowing nitrogen atmosphere with low content of oxygen
Uppsats för yrkesexamina på avancerad nivå, MaterialvetenskapSammanfattning : Abstract The behavior for MoSi2 based high temperature heating elements for resistive heating has been examined in elevated temperature and low oxygen content environment. MoSi2 spontaneously forms a protective SiO2 scale at high temperature if the amount of oxygen in the ambient atmosphere is sufficient according to the following reaction: 5MoSi2 + 7O2(g) 7SiO2 + Mo5Si3 If the oxygen content at a specific temperature is too low, SiO(g) is more stable than SiO2 and the following reaction will occur instead: 2SiO2 2SiO(g) + O2(g) Then surface will be Si-deplated and finally, the base material will be exposed. LÄS MER