等离子喷涂中雷诺数对熔滴扁平化行为的影响

doi:10.15541/jim20140212

无机材料学报 ›› 2015, Vol. 30 ›› Issue (1): 65-70.DOI: 10.15541/jim20140212 CSTR: 32189.14.10.15541/jim20140212

等离子喷涂中雷诺数对熔滴扁平化行为的影响

陈丹¹, 王玉¹, 白宇¹, 王运会², 赵蕾¹, 付倩倩¹, 王海军³, 韩志海¹

(1. 西安交通大学金属材料强度国家重点实验室, 西安710049; 2. 清华大学工程力学系, 北京100084; 3. 装甲兵工程学院, 北京110000)

收稿日期:2014-04-24 修回日期:2014-06-24 出版日期:2015-01-20 网络出版日期:2014-12-29
作者简介:陈丹(1990–), 女, 硕士研究生. E-mail: dandan0408@stu.xjtu.edu.cn
基金资助:
国家自然科学基金(51202187);中国博士后科学基金(2014T70916)

Effect of Reynolds Number of Molten Particle on Splat Formation in Plasma Spraying

CHEN Dan¹, WANG Yu¹, BAI Yu¹, WANG Yun-Hui², ZHAO Lei¹, Fu Qian-Qian¹, WANG Hai-Jun³, HAN Zhi-Hai¹

(1. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China; 2. Department of Engineering Mechanics, Qinghua University, Beijing 100084, China; 3. Armoring Soldiers Project Academy, Beijing 110000, China)

Received:2014-04-24 Revised:2014-06-24 Published:2015-01-20 Online:2014-12-29
About author:CHEN Dan. E-mail: dandan0408@stu.xjtu.edu.cn
Supported by:
National Natural Science Foundation of China (51202187);National Science Foundation for Post-doctoral Scientists of China (2014T70916)

摘要/Abstract

摘要：

采用狭缝法收集不同工艺条件(雷诺数)下的氧化钇部分稳定的二氧化锆(YSZ)扁平粒子, 采用扫描电子显微镜(SEM)及三维激光显微镜观察形貌, 同时采用Fluent流体力学软件模拟不同雷诺数下YSZ熔滴的铺展和凝固过程, 研究雷诺数对扁平粒子形貌的影响规律。实验及计算结果表明: 当欧氏数大于0.2时, 雷诺数对YSZ熔滴的扁平化行为具有重要的影响作用, 熔滴飞溅的临界雷诺数为450±20, 即当雷诺数小于450±20时, 熔滴呈圆盘状且不发生飞溅, 反之熔滴发生飞溅。对于粒径相同的YSZ熔滴, 超音速等离子喷涂(SAPS)获得的熔滴扁平率约为普通等离子喷涂(APS)工艺的1.3倍。

关键词: 等离子喷涂, YSZ熔滴, 扁平粒子, 雷诺数

Abstract:

Effect of Reynolds number on the flattening behavior of in-flight particles was investigated by slit method. Molten 6wt%-8wt% yttria-stabilized zirconia (YSZ) particles with different Reynolds numbers were collected. The morphology of splats was examined using scanning electron microscope (SEM) and 3D laser microscope. Meanwhile, the behavior of spreading, heat transfer and solidification of YSZ droplets with different Reynolds numbers were simulated by CFD software Fluent. The results show that the flattening behavior of molten particles is significantly influenced by Reynolds number when Ohnesorge number exceeds 0.2. The splat tends to splash with the increase of Reynolds number. At a lower Reynolds number, the splats exhibit a regular disc-shape. However, when Reynolds number reaches 450±20, splats begin to splash. In addition, for the original molten particles with the same diameters, the flattening ratio of molten particles in supersonic atmospheric plasma spraying (SAPS) is approximately 1.3 times as much as that in atmospheric plasma spraying (APS).

Key words: plasma spraying, molten YSZ particle, splat, Reynolds number

中图分类号:

TG174

陈丹, 王玉, 白宇, 王运会, 赵蕾, 付倩倩, 王海军, 韩志海. 等离子喷涂中雷诺数对熔滴扁平化行为的影响[J]. 无机材料学报, 2015, 30(1): 65-70.

CHEN Dan, WANG Yu, BAI Yu, WANG Yun-Hui, ZHAO Lei, Fu Qian-Qian, WANG Hai-Jun, HAN Zhi-Hai. Effect of Reynolds Number of Molten Particle on Splat Formation in Plasma Spraying[J]. Journal of Inorganic Materials, 2015, 30(1): 65-70.

图/表 12

参考文献 23

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Spray methods	Ar /slpm	H₂ /slpm	Power P/kW	Voltage U/V	Current I/A	Spray distance D/mm	Feed rate /(g?min^-1)	Temperature T/℃	Velocity v/(m?s^-1)
SAPS	70.5	22	68.6	138	497	110	35	2919.0±2.0	505.0±3.8
SAPS	75.0	21	58.5	124	472	90	35	2813.9±2.5	484.5±9.3
SAPS	60.3	15	44.5	125	356	90	35	2685.4±2.7	464.5±3.0
SAPS	75.0	21	58.5	124	472	80	35	2680.0±14.7	544.5±13.5
SAPS	75.0	21	58.5	124	472	100	35	3066.4±10.1	544.2±13.0
SAPS	75.0	21	58.5	124	472	120	35	3196.4±10.1	584.4±28.0
APS	32.9	8.225	44.0	67.6	650	90	38.4	2804.4±5.4	224.0±5.1
APS	42.3	10.575	44.0	71.4	611	90	38.4	2740.2±3.7	231.0±4.2
APS	51.7	12.925	44.0	75.6	585	90	38.4	2683.6±4.5	233.3±3.6
APS	47.0	11.750	48.0	74.0	650	80	38.4	2680.0±3.3	238.5±3.1
APS	47.0	11.750	48.0	74.0	650	100	38.4	2934.1±4.2	244.0±3.1
APS	47.0	11.750	48.0	74.0	650	120	38.4	2804.7±5.1	226.5±2.3

Spray methods	Ar /slpm	H₂ /slpm	Power P/kW	Voltage U/V	Current I/A	Spray distance D/mm	Feed rate /(g?min^-1)	Temperature T/℃	Velocity v/(m?s^-1)
SAPS	70.5	22	68.6	138	497	110	35	2919.0±2.0	505.0±3.8
SAPS	75.0	21	58.5	124	472	90	35	2813.9±2.5	484.5±9.3
SAPS	60.3	15	44.5	125	356	90	35	2685.4±2.7	464.5±3.0
SAPS	75.0	21	58.5	124	472	80	35	2680.0±14.7	544.5±13.5
SAPS	75.0	21	58.5	124	472	100	35	3066.4±10.1	544.2±13.0
SAPS	75.0	21	58.5	124	472	120	35	3196.4±10.1	584.4±28.0
APS	32.9	8.225	44.0	67.6	650	90	38.4	2804.4±5.4	224.0±5.1
APS	42.3	10.575	44.0	71.4	611	90	38.4	2740.2±3.7	231.0±4.2
APS	51.7	12.925	44.0	75.6	585	90	38.4	2683.6±4.5	233.3±3.6
APS	47.0	11.750	48.0	74.0	650	80	38.4	2680.0±3.3	238.5±3.1
APS	47.0	11.750	48.0	74.0	650	100	38.4	2934.1±4.2	244.0±3.1
APS	47.0	11.750	48.0	74.0	650	120	38.4	2804.7±5.1	226.5±2.3

Property of YSZ	Value	Property of YSZ	Value
Density	5890 kg/m³	Solidus temperature	2923.13 K
Specific heat	713 J/( kg?K)	Liquidus temperuture	3023.13 K
Thermal conductivity	2.32 W/(m?K)	Thermal contact resistance	10^-6 m²?K/W
Viscosity	0.008 kg/( m?s)	Surface tension	0.43 N/m
Molecular weight	123	Property of substrate	Value
Standard state enthalpy	-11.006×10⁸ J/mol	Density	8400 kg/m³
Reference temperature	298.15 K	Specific heat	575 J/( kg?K)
Melting heat	7.07×10⁵ J/kg	Thermal conductivity	18.779 W/( m?K)

Property of YSZ	Value	Property of YSZ	Value
Density	5890 kg/m³	Solidus temperature	2923.13 K
Specific heat	713 J/( kg?K)	Liquidus temperuture	3023.13 K
Thermal conductivity	2.32 W/(m?K)	Thermal contact resistance	10^-6 m²?K/W
Viscosity	0.008 kg/( m?s)	Surface tension	0.43 N/m
Molecular weight	123	Property of substrate	Value
Standard state enthalpy	-11.006×10⁸ J/mol	Density	8400 kg/m³
Reference temperature	298.15 K	Specific heat	575 J/( kg?K)
Melting heat	7.07×10⁵ J/kg	Thermal conductivity	18.779 W/( m?K)

Sample	Spray methods	Temperature /℃	Velocity /(m·s^-1)	Original diameter /μm	Re	We	Oh	Splashing or not
1	SAPS	2680.0	544.5	6.0	414.7	2.44×10⁴	0.376	No
2	SAPS	2680.0	544.5	7.5	518.4	3.05×10⁴	0.337	Yes
3	SAPS	3066.4	544.2	6.8	563.5	2.76×10⁴	0.294	Yes
4	SAPS	3066.4	544.2	5.0	414.1	2.03×10⁴	0.342	No
5	SAPS	3196.4	584.4	5.0	469.0	2.34×10⁴	0.326	No
6	SAPS	3196.4	584.4	6.4	600.3	2.99×10⁴	0.288	Yes
7	APS	2680.0	238.5	14.5	439.0	1.13×10⁴	0.241	Yes
8	APS	2934.1	244.0	16.5	578.4	1.35×10⁴	0.200	Yes
9	APS	2934.1	244.0	15.6	546.8	1.27×10⁴	0.206	No
10	APS	2804.7	226.5	17.9	549.0	1.26×10⁴	0.204	Yes

等离子喷涂中雷诺数对熔滴扁平化行为的影响

Effect of Reynolds Number of Molten Particle on Splat Formation in Plasma Spraying

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