超音速火焰喷涂CoCrAlYSi-hBN涂层组织和性能

张昂; 王长亮; 王天颖; 高俊国; 郭孟秋; 崔永静; 田浩亮

doi:10.11868/j.issn.1005-5053.2020.000021

超音速火焰喷涂CoCrAlYSi-hBN涂层组织和性能

doi: 10.11868/j.issn.1005-5053.2020.000021

中国航发北京航空材料研究院航空材料先进腐蚀与防护重点实验室，北京 100095

基金项目: 航空发动机机及燃气轮机关键摩擦副长寿命高耐磨复合功能涂层摩擦学原理与制造技术基础（2017-VII-0013-0110）

详细信息

通讯作者:
王长亮（1981—），男，高级工程师，主要从事热喷涂材料和工艺研究，联系地址：北京市海淀区温泉镇环山村8号北京航空材料研究院（100095），E-mail：cliangwang@126.com

中图分类号: TG174.442
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出版历程
- 收稿日期: 2020-02-07
- 修回日期: 2020-08-23
- 网络出版日期: 2020-08-20
- 刊出日期: 2020-10-01

The microstructure and properties of CoCrAlYSi-hBN coating prepared by HVOF

Key Laboratory of Advanced Corrosion and Protection for Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China

摘要

摘要: 采用超音速火焰喷涂（HVOF）方法制备CoCrAlYSi-hBN涂层，通过对涂层显微组织、硬度和结合强度的测试，探讨喷涂工艺参数（燃气流量和喷涂距离）的变化对涂层组织与性能的影响。采用扫描电镜（SEM）和能谱仪（EDS）研究涂层的形貌、微观组织及涂层成分，采用显微硬度计和拉伸试验机测试涂层的显微硬度和结合强度。研究结果表明：随着燃气流量的增加，喷涂粉末粒子熔化更充分，涂层中孔隙和氮化硼含量呈降低趋势，涂层硬度增加，结合强度先升高后降低；随喷涂距离增加，氧化物夹杂增多，涂层硬度呈现增大的趋势，结合强度先增加后降低。喷涂距离为225 mm时，涂层孔隙率和氮化硼含量很低，导致其高的硬度和结合强度。
- 超音速火焰喷涂 /
- CoCrAlYSi-hBN涂层 /
- 微观组织 /
- 力学性能
Abstract: CoCrAlYSi-hBN coating was fabricated using the high-velocity oxygen fuel (HVOF) process under several processing conditions, and the effects of process parameters, gas flow and spray distance, on the microstructure and properties of the coating were investigated in the present paper. The microstructure, hardness, bonding strength and chemical composition of the coating was researched by using scanning electronmicroscopy (SEM), microhardness tester, adhesive strength measuring and energy dispersive spectroscopy (EDS). The results show that with the increasing gas flow, the porosity and h-BN content of the coating are reduced, and the hardness is improved; However, the bonding strength increases first and then decreases due to excessive energy leading serious oxidation. With the increase of spraying distance, the oxide inclusions are increased, which causes the hardness of coatings increase and the bonding strength decrease. In addition, when the spraying distance is 225 mm, the hardness and bonding strength of the coating are the highest due to the low porosity and boron nitride content.
- HVOF /
- CoCrAlYSi-hBN coating /
- microstructure /
- mechanical properties

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图 1 CoCrAlYSi-hBN粉末形貌

Figure 1. Morphology of CoCrAlYSi-hBN powder

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图 2 不同喷涂工艺参数下涂层金相显微组织　（a）1#；（b）2#；（c）3#；（d）4#；（e）5#；（f）6#

Figure 2. Microstructure of CoCrAlYSi-hBN coatings under different spraying parameters　（a）1#；（b）2#；（c）3#；（d）4#；（e）5#；（f）6#

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图 4 5#喷涂参数下涂层蓝色区域能谱

Figure 4. EDS testing of coating dark area under spraying parameter 5#

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图 5 涂层硬度与喷涂工艺参数（燃气流量和喷涂距离）的关系

Figure 5. Relationships between coating hardness and coating process parameters （gas flow and spray distance）

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图 3 涂层中（hBN+孔隙）含量（a）和氧化物含量（b）与喷涂工艺的关系

Figure 3. Relationships between the content of （hBN+pore）（Z axis） and coating process parameters（a）and relationships between the content of oxides （Z axis） and coating process parameters（b）

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图 6 涂层结合强度（Z轴）与喷涂工艺参数（X轴：燃气流量和Y轴：喷涂距离）的关系

Figure 6. Relationships between coating bonding strength（Z axis） and coating process parameters（X axis：gas flow and Y axis：spray distance）

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表 1 CoCrAlYSi-hBN粉末化学成分（质量分数/%）

Table 1. Chemical composition and content of the CoCrAlYSi-hBN powder （mass fraction/%）

Co	Cr	Al	Y	Si	hBN
Bal.	25	5	0.27	1.75	15

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表 2 喷涂工艺参数

Table 2. Spraying parameters

Procedures	Spraying parameters
Procedures	O₂flowrate/（L•min⁻¹）	C₃H₈flowrate/（L•min⁻¹）	Air flowrate/（L•min⁻¹）	Feed pressure /kPa	Spray distance /mm
1#	25	25	40	15.85	275
2#	28	28			275
3#	28	28			225
4#	28	28			325
5#	32	32			275
6#	36	36			275

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表 3 不同喷涂工艺参数下涂层（孔隙率+hBN）及氧化物含量

Table 3. （Pores+hBN） and oxides content of CoCrAlYSi-hBN coatings under different spraying parameters

Procedures	Content/%
Procedures	（Pores+hBN）	Oxides
1#	3.00	5.62
2#	3.61	8.61
3#	0.21	8.11
4#	2.09	10.35
5#	1.83	12.09
6#	1.68	14.79

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表 4 能谱分析得到的不同工艺条件下的涂层中各元素的质量分数

Table 4. Mass fraction of element of CoCrAlYSi-hBN coating under various spraying parametersby EDS analysis

Procedures	Mass fraction of element/%
Procedures	C	O	Al	Si	Cr	Co
1#	8.97	3.23	5.09	1.85	25.97	54.95
2#	3.96	5.54	6.55	2.08	34.99	46.87
3#	17.38	4.89	4.26	1.54	23.10	48.83
4#	4.76	6.66	6.51	2.33	34.92	44.81
5#	7.51	6.80	6.36	2.23	33.50	43.61
6#	6.72	7.39	5.13	1.60	25.11	54.05

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表 5 涂层显微硬度测试结果

Table 5. Coating microhardness with different spraying process

Prodecures	HV_0.3										Average
Prodecures	1	2	3	4	5	6	7	8	9	10	Average
1#	284.6	334.9	255.0	300.8	332.4	289.2	284.0	323.7	274.6	347.6	302.7
2#	282.7	327.6	334.9	298.7	361.9	291.2	335.7	352.0	328.4	298.0	321.1
3#	472.7	408.4	501.5	464.5	431.5	425.6	405.1	385.1	451.4	377.1	432.3
4#	322.9	408.4	280.2	382.1	476.9	383.1	433.9	347.6	422.0	308.1	376.5
5#	334.1	324.5	357.3	442.5	346.7	333.3	310.8	387.2	351.8	360.6	354.9
6#	423.2	351.1	430.3	362.8	427.9	328.4	492.6	335.7	344.1	419.7	391.6

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表 6 涂层结合强度实验结果

Table 6. Coating bonding strength under different spraying process

Procedures	Bonding strength/MPa			Average/MPa
Procedures	1	2	3	Average/MPa
1#	45.08	55.42	49.27	49.92
2#	62.44	60.83	46.93	56.73
3#	58.76	56.91	63.22	59.63
4#	56.82	50.56	52.70	53.36
5#	61.50	57.56	60.49	59.85
6#	53.62	54.35	47.09	51.69

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