<strong>B</strong>清除大气等离子喷涂<strong>CuNi</strong>熔滴氧化物效应

doi:10.11900/0412.1961.2021.00167

金属学报

2022, Vol. 58

Issue (2): 206-214 DOI: 10.11900/0412.1961.2021.00167

研究论文

本期目录 | 过刊浏览

B清除大气等离子喷涂CuNi熔滴氧化物效应

董昕远, 雒晓涛, 李成新, 李长久(

)

西安交通大学金属材料强度国家重点实验室西安 710049

Oxide Cleaning Effect of In-Flight CuNi Droplet During Atmospheric Plasma Spraying by B Addition

REN Yuan, DONG Xinyuan, SUN Hao, LUO Xiaotao(

)

State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China

引用本文:

董昕远, 雒晓涛, 李成新, 李长久. B清除大气等离子喷涂CuNi熔滴氧化物效应[J]. 金属学报, 2022, 58(2): 206-214.
Yuan REN, Xinyuan DONG, Hao SUN, Xiaotao LUO. Oxide Cleaning Effect of In-Flight CuNi Droplet During Atmospheric Plasma Spraying by B Addition[J]. Acta Metall Sin, 2022, 58(2): 206-214.

全文: PDF(2220 KB) HTML

摘要:

提出了粉末中添加B的成分设计，实现通过B牺牲氧化而保护合金元素不氧化从而发展高温CuNi熔滴自清洁氧化物效应。采用CuNi2B与CuNi4B 2种粉末，通过大气等离子喷涂工艺制备涂层，通过SEM、EDS、XRD和ICP-OES等方法研究了B含量与喷涂距离对CuNi涂层组织结构与性能的影响。结果表明，熔滴可加热至1900℃以上，粉末中B的引入可抑制飞行中高温熔滴中的合金元素的氧化，从而显著降低CuNi涂层中的O含量，而该效果受熔滴中B含量影响显著。采用4%B的CuNi合金粉末时，随着喷涂距离的增加，涂层中的氧化物显著降低，涂层中的O主要由熔滴沉积后的氧化引入，优化喷涂工艺制备的涂层O含量降低至0.43%，显著低于CuNiIn涂层的3.5%。当CuNi粉末含B为1.83%时，在距离超过100 mm，B含量降至0.5%以下时，不足以抑制等离子喷涂过程中飞行颗粒的合金元素氧化，故实现高温熔滴氧化保护的临界B含量约为0.5%。研究发现，B添加可引起合金熔点降低效应与去氧化物净化效应，从而显著增强了CuNi粒子间的冶金结合，提高了涂层的致密性；涂层B含量随粉末成分与工艺参数从0.26%增加至3.61%，而CuNi涂层硬度则随B含量增加从151 HV_0.2线性增加至457 HV_0.2。

关键词 ： CuNiIn涂层, CuNiB涂层, 组织与性能, 层间结合, 自熔效应, 等离子喷涂

Abstract：

A large amount of air is drawn into the high-temperature plasma jet during the atmospheric plasma spraying (APS) process because it operates in an atmospheric environment, thus oxidizing metal-spray particles. The oxide inclusion resulting from in-flight droplet oxidation inhibits the metallurgical bonding between lamellae in the coating, which limits the applications of plasma-sprayed metal coatings. In this study, a novel approach to create oxide-free molten droplets is proposed by adding B to the CuNi powder to achieve sacrificial oxidation of B in the high-temperature droplet and protect the alloy elements from oxidation. Two powders of CuNi2B and CuNi4B were prepared to deposit the coatings via APS. The effect of B content and spray distance on the microstructure, as well as the O content of CuNi coating, was studied using methods such as SEM, EDS, XRD, and inductively coupled plasma-optical emission spectrum (ICP-CES). The results show that the droplet can be heated to more than 1900^oC, and the introduction of B in the powder can inhibit the oxidation of alloy elements in the high-temperature droplet during flight, thus reducing the oxygen in the CuNi coating. Moreover, the deoxidizing effect is affected by the B content of the droplet. Using 4%B CuNi alloy powder and increasing spray distance, the oxide in the coating is reduced. The oxygen in the coating is introduced via oxidation after droplet deposition, and the oxygen content of the coating prepared using the optimized spraying process is reduced to 0.43%, which is considerably lower than 3.5% of CuNiIn coating. An increase in the spray distance and a reduction in B content of CuNi powder, which contains 1.83%B, to 0.5% is insufficient to inhibit the oxidation of the alloying elements of the in-flight particles. The result yields a critical B content of approximately 0.5% for high-temperature droplet oxidation protection. The increase in the B content decreases the melting point, as well as the oxidation of the alloy, thus enhancing the metallurgical bonding between CuNi particles and improving the compactness of the coating. In addition, with the increase in the B content of the coating through the powder composition design and process parameters control from 0.26% to 3.61%, the microhardness of CuNi coating increases from 151 HV_0.2 to 457 HV_0.2.

Key words： CuNiIn coating CuNiB coating microstructure and property interlayer bonding self-fusion effect plasma spraying

收稿日期: 2021-04-19

ZTFLH:

TG174.4

基金资助:国家自然科学基金重点项目(52031010)

作者简介: 李长久，licj@mail.xjtu.edu.cn，主要从事热喷涂层结构与性能、涂层沉积机制的研究
第一联系人：任媛，女，1995年，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00167 或 https://www.ams.org.cn/CN/Y2022/V58/I2/206

图1 CuNiIn、CuNi2B和CuNi4B粉末粒子的SEM像

表1 原始粉末化学成分 (mass fraction / %)

图2 CuNiIn和CuNiB涂层中O含量随喷涂距离的变化

图3 大气等离子喷涂(APS) CuNiIn、CuNi2B和CuNi4B涂层及粉末的XRD谱

图4 不同喷涂距离条件下APS CuNiIn、CuNi2B及CuNi4B涂层的SEM像

图5 CuNiIn涂层断面组织与典型区域O的EDS结果

图6 喷涂距离对CuNiIn、CuNi2B和CuNi4B涂层孔隙率的影响

图7 喷涂距离120 mm时制备的CuNi4B涂层断面腐蚀前后的SEM像

图8 CuNi4B (粒径30~50 μm)粒子温度随喷涂距离的演变

图9 CuNi2B与CuNi4B涂层B含量随喷涂距离的变化

表2 CuNi4B合金物性参数

图10 熔融粒子与固态基体界面温度变化

图11 CuNiB涂层B含量与硬度之间的关系

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