Si<sub>3</sub>N<sub>4</sub>-hBN复相陶瓷在氢氟酸和冰晶石熔盐中的腐蚀行为研究

doi:10.11903/1002.6495.2016.170

腐蚀科学与防护技术

2017, Vol. 29

Issue (3): 220-226 DOI: 10.11903/1002.6495.2016.170

研究报告

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Si₃N₄-hBN复相陶瓷在氢氟酸和冰晶石熔盐中的腐蚀行为研究

张昌松,刘强(

),陈威

陕西科技大学机电工程学院西安 710021

Corrosion Behavior of Si₃N₄-hBN Composite Ceramics in HF Solutions and Cryolite Molten Salt

Changsong ZHANG,Qiang LIU(

),Wei CHEN

College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China

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摘要:

利用热压烧结工艺制备了不同hBN含量的Si₃N₄-hBN复相陶瓷,研究了Si₃N₄陶瓷和hBN质量分数为10%的Si₃N₄-hBN复相陶瓷,在40 ℃不同摩尔浓度的HF溶液和850 ℃冰晶石熔盐中的腐蚀行为。结果表明：Si₃N₄基陶瓷在酸和熔盐中腐蚀时,都表现为失重现象。其中,在HF溶液中的腐蚀格外严重,随着腐蚀液浓度的升高,腐蚀速率逐渐增大,失重愈发明显,Si₃N₄-10%hBN复相陶瓷较Si₃N₄陶瓷腐蚀严重;在冰晶石熔盐中的腐蚀,前20 h时Si₃N₄-10%hBN复相陶瓷的腐蚀速率远高于Si₃N₄陶瓷,当20 h后Si₃N₄陶瓷腐蚀速率逐渐超过Si₃N₄-10%hBN复相陶瓷,最终的腐蚀速率表现为Si₃N₄-10%hBN复相陶瓷高于Si₃N₄陶瓷。腐蚀失重原因归为两点：腐蚀试样本身的致密度和原始形貌以及腐蚀试样本身Si₃N₄的含量。

关键词 ：复相陶瓷, 腐蚀行为, 氢氟酸, 冰晶石熔盐

Abstract：

Si₃N₄-hBN composite ceramics with different hBN content were prepared by hot pressed sintering process. Then the corrosion behavior of Si₃N₄ ceramic and Si₃N₄-10% (mass fraction) hBN composite ceramics was studied in HF solution with various molarities at 40 ℃and cryolite molten salt at 850 ℃ respectively. The results show that that the Si₃N₄ ceramics were suffered from significant corrosion in the above acid solution and molten. The corrosion of the two type ceramics in HF solutions was particularly serious, and their corrosion rate increased gradually with the increasing HF concentration, while the corrosion of Si₃N₄-10%hBN ceramics was much serious than that of Si₃N₄ ceramics. In cryolite molten salt, the corrosion rate of Si₃N₄-10%hBN was much higher than that of Si₃N₄ ceramic for the initial 20 h, hereafter the corrosion rate of Si₃N₄ ceramics gradually exceeded that of Si₃N₄-10%hBN ceramics, and in the final corrosion stage the corrosion rates of the two type ceramics reversed again. It is thought that the corrosion performance of the ceramics may be subjected to the microstructure and the Si₃N₄content of the as prepared ceramics.

Key words： composite ceramics corrosion behavior HF solution cryolite molten salt

收稿日期: 2016-07-11

基金资助:国家自然科学基金 (51405278),陕西科技大学引进博士科研启动基金 (BJ11-01),陕西省自然科学基础研究计划 (2015JM5242) 和特种材料及制备技术四川省高校重点实验室开放基金 (szjj2015-088)

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引用本文:

张昌松,刘强,陈威. Si₃N₄-hBN复相陶瓷在氢氟酸和冰晶石熔盐中的腐蚀行为研究[J]. 腐蚀科学与防护技术, 2017, 29(3): 220-226.
Changsong ZHANG, Qiang LIU, Wei CHEN. Corrosion Behavior of Si₃N₄-hBN Composite Ceramics in HF Solutions and Cryolite Molten Salt. Corrosion Science and Protetion Technology, 2017, 29(3): 220-226.

链接本文:

https://www.cspt.org.cn/CN/10.11903/1002.6495.2016.170 或 https://www.cspt.org.cn/CN/Y2017/V29/I3/220

图1 未腐蚀试样表面形貌和Si3N4-10%hBN陶瓷表面气孔孔径统计结果

图2 复合陶瓷在HF溶液中的腐蚀行为

图3 复合陶瓷在HF溶液中的腐蚀表面形貌

图4 腐蚀形貌的EDAX分析

图5 腐蚀产物的XRD谱

图6 复合陶瓷在熔融电解质中的腐蚀行为

图7 复合陶瓷在冰晶石熔盐中的腐蚀表面形貌

图8 腐蚀形貌EDAX分析

图9 腐蚀产物的XRD谱

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