典型MoSi2发热元件物相与显微结构分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: The Comparative Analysis of Micor-topography for Kanthal and Domestic MoSi2 Heating Element

Author(s):: Huang Wenjiang; Zhou Ying; Li Sima; Cheng Liang; Happiness King; World; School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001

摘要:: 采用XRD、SEM和EDS等手段分别对Kanthal公司Super1700、Super1800和国产某厂三种不同MoSi2发热元件的物相组成、微观形貌和微区元素成分进行分析，探讨了非MoSi2相对典型发热元件使用性能的影响，结果表明：（1）单质Mo对MoSi2发热元件使用温度的提高非常不利；在高温条件，参与的单质Mo会与氧气反应生成气相的MoO3，使发热元件表面鼓包并造成玻璃膜破坏。（2）国产发热元件生产过程中应适当提高膨润土的加入量，并严格控制膨润土中K、Na等活性碱金属氧化物的量。（3）通过添加W元素合金化的方法来制备复合MoSi2粉并取代传统的MoSi2粉，可以提高发热元件的使用温度和使用寿命。

Abstract:: The phase composition, microstructure and micro-area elements analysis of Kanthal and domestic MoSi2 heating element were studied by X-ray diffraction analysis（XRD），scanning electron microscope（SEM）and energy dispersive spectrometer（EDS）. The impacr of other substancesexcept for the MoSi2 phase on the performance of typical MoSi2 heating elements was investigated. The results showed that:(1)Elemental Mo was detrimental to improving the service temperature of the MoSi2 heating element. MoO3 gas was formed by the reaction of residual Mo and oxygen at high temperture, resulting in the emergence of bubble on the surface and damage to the glass film. (2)It was necessary to increase the amount of bentonite during the production process of domestic heating element, while the amount of K, Na and other active alkali metal oxide in the bentonite was strictly controlled.(3)The MoSi2 composite powders were synthesized via alloying method of adding W in replace of traditional MoSi2 powders, which could improve the service life and operating temperature of the heating element.