熔炼工艺对DZ22B高温合金与SiO<sub>2</sub>陶瓷界面反应的影响

李志贤; 杨伟; 余欢

doi:10.15980/j.tzzz.2019.09.016

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熔炼工艺对DZ22B高温合金与SiO₂陶瓷界面反应的影响
Effects of Melting Parameters on Interfacial Reaction between DZ22B Superalloy and Silica Ceramic
2019年39卷第9期页码：984-988
纸质出版日期： 2019 ，
DOI： 10.15980/j.tzzz.2019.09.016

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[1]李志贤,杨伟,余欢.熔炼工艺对DZ22B高温合金与SiO_2陶瓷界面反应的影响[J].特种铸造及有色合金,2019,39(09):984-988.

Li Zhixian, Yang Wei, Yu Huan. Effects of Melting Parameters on Interfacial Reaction between DZ22B Superalloy and Silica Ceramic[J]. Special Casting & Nonferrous Alloys, 2019,39(9):984-988.
[1]李志贤,杨伟,余欢.熔炼工艺对DZ22B高温合金与SiO_2陶瓷界面反应的影响[J].特种铸造及有色合金,2019,39(09):984-988. DOI： 10.15980/j.tzzz.2019.09.016.

Li Zhixian, Yang Wei, Yu Huan. Effects of Melting Parameters on Interfacial Reaction between DZ22B Superalloy and Silica Ceramic[J]. Special Casting & Nonferrous Alloys, 2019,39(9):984-988. DOI： 10.15980/j.tzzz.2019.09.016.

摘要

采用真空感应熔炼与惰性气体保护相结合

开展了DZ22B高温合金与SiO

陶瓷的原位界面反应研究。通过改变熔体温度及保温时间

对比分析了不同熔炼工艺下界面反应的产物类型及形成过程

探讨了界面反应对铸件表面粘砂缺陷的影响。结果表明

高温合金中Hf元素易与SiO

发生界面反应

形成HfO

的反应产物。当熔炼温度为1 400℃时

随保温时间延长

合金与陶瓷接触部位先后出现无界面反应、弱界面反应及强界面反应情况

其中保温20min后

可形成平均厚度为0.5μm的连续分布致密反应层。随熔炼温度提高

界面反应程度逐渐加深

其中熔炼温度为1 600℃、保温15min条件下反应层厚度达2.3μm

同时导致合金表面发生严重的粘砂缺陷。

Abstract

In situ interface reaction between DZ22B superalloy and SiO

ceramic was performed by vacuum induction melting and inertial gas protection.Both the phase structure and formation process of interfacial reaction product were analyzed comparatively at different parameters in terms of melting temperature and holding time.Moreover

the effects of interfacial reaction on sand sticking defect on the surface of castings were analyzed.The results show that Hf element in superalloy is prone to react with SiO

resulting in the formation of HfO

.With the melting temperature of 1 400℃

there presents the tendency successively of interfacial reaction free

weak interfacial reaction and strong interfacial reaction between alloy and ceramic with extending contact time.After holding for 20 minutes

a continuous dense reaction layer with an average thickness of 0.5μm can be observed.In addition

serious interfacial reaction occurs with the increase of melting temperature.The thickness of reaction layer reaches 2.3μm at 1 600℃ for 15 min

leading to serious sand sticking defect on the surface of castings.