Mechanical and Tribological Properties of PEEK Coatings with Different Melt Indexes Prepared by Electrostatic Powder Spray Technique†

doi:10.7503/cjcu20140006

Abstract

Abstract:

Poly-ether-ether-ketone(PEEK) coatings with different melt indexes(MI) were prepared on the stainless steel substrate via electrostatic powder spraying method. Amorphous coatings were obtained by quenching the as-melted coatings into the ice-water medium. Semi-crystalline coatings were obtained by annealing the amorphous coatings in an oven for 30 min at 260 ℃. The XRD results indicates that the structure of PEEK coatings transforms from amorphous to semi-crystalline via the treatment of annealing. The hardness and the behavior friction of the PEEK coatings were tested. The result demonstrates that by the same treatment, the PEEK coatings with larger MI have higher crystallinity. The semi-crystalline PEEK coatings have higher hardness, lower friction coefficient and better wear rate than the amorphous ones. The poor fluidity of PEEK-A with lower MI leads to the rough coatings. Both of the PEEK-B and PEEK-C with larger MI can form smooth coatings and the friction coefficients and wear rates of them are stable. The friction coefficients of semi-crystalline coatings B and C are less than 0.15, and the wear rates are less than 20×10^-6 mm³/(N·m). Therefore PEEK with larger MI is more suitable for the preparation of PEEK coating by electrostatic spraying.

Key words: Poly-ether-ether-ketone(PEEK) coating, Electrostatic powder spraying, Crystallization, Hardness, Tribological performance

CLC Number:

O631
O69

TrendMD:

ZHU Shiyang, ZHANG Yunhe, LI Qingwei, JI Fangang, GUAN Shaowei. Mechanical and Tribological Properties of PEEK Coatings with Different Melt Indexes Prepared by Electrostatic Powder Spray Technique^†[J]. Chem. J. Chinese Universities, 2014, 35(5): 1075.

Figures/Tables 5

Fig.1 SEM image(A) and particle size distribution(B) of PEEK powder after smashed

Fig.2 XRD patterns of coatings A-Q(a), A(b), B-Q(c), B(d), C-Q(e) and C(f)

Table 1 Details of amorphous and semi-crystalline PEEK coatings with different melt indexes

Coating cord	Corresponding powder	Crystallinity(%)	Hardness/(N·mm^-2)	Friction	10⁶ Wear/(mm³·N^-1·m^-1)
A-Q	PEEK-A	0	14.42	0.3965	49.52
B-Q	PEEK-B	0	14.96	0.1498	17.23
C-Q	PEEK-C	0	14.23	0.2184	17.10
A	PEEK-A	42.56	20.11	0.2197	30.30
B	PEEK-B	49.44	21.11	0.1266	11.41
C	PEEK-C	51.30	20.82	0.0984	16.97

Fig.3 Friction coefficient evolutions of coatings A-Q(A1), A(A2), B-Q(B1), B(B2), C-Q(C1) and C(C2)^ Applied load: 1 N; sliding velocity: 0.33 m/s.

Fig.4 SEM micrograph of worn surfaces of coating B

References 18

[1]	Attwood T. E., Dawson P. C., Freeman J. L., Hoy L. R. J., Rose J. B., Staniland P. A., Polymer, 1981, 22(8), 1096—1103
[2]	Zhao C., Zhang Y.L., Poly-ether-ether-ketone, Chemical Industry Press, Beijing, 2008, 23—153
	(赵纯, 张玉龙. 聚醚醚酮, 北京:化学工业出版社, 2008, 23—153)
[3]	Wu Z. W., New Chemical Materials, 2002, 2002,30(6), 15—18)
	(吴忠文.化工新型材料, 2002,30(6), 15—18)
[4]	Jin L. W., Guan S. W., Liu B. J., Li K. C., Zeng Z., Chen W. H., Jiang Z. H., Chem. J. Chinese Universities, 2009, 30(1), 224—226
	(井丽巍, 关绍巍, 刘佰军, 李克昌, 曾智, 陈文慧, 姜振华.高等学校化学学报, 2009,30(1), 224—226)
[5]	Xu D., Wang Y., Zhang Y., Zhang G., Shao K., Li S. W., Chem. Res. Chinese Universities, 2010, 26(6), 1031—1034
[6]	Dai Z. M., Zhu S. Y., Liu S. Y., Guan S. W., High Performance Polymers, 2012, 24(7), 609—615
[7]	Bijwe J., Sen S., Ghosh A., Wear, 2005, 258(10), 1536—1542
[8]	Hedayati M., Salehi M., Bagheri R., Panjepour M., Naeimi F., Prog. Org. Coat., 2012, 74(1), 50—58
[9]	Normand B., Takenouti H., Keddam M., Liao H., Monteil G., Coddet C., Electrochimica Acta, 2004, 49(17), 2981—2986
[10]	Zhang G., Liao H., Li H., Mateus C., Bordes J. M., Coddet C., Wear, 2006, 260(6), 594—600
[11]	Corni I., Neumann N., Eifler D., Boccaccini A. R., Advanced Engineering Materials, 2008, 10(6), 559—564
[12]	Li J., Liao H., Coddet C., Wear, 2002, 252(9), 824—831
[13]	Simonin L., Liao H., Macromolecular Materials and Engineering, 2000, 283(1), 153—162
[14]	Palathai T., Tharajak J., Sombatsompop N., Materials Science and Engineering: A, 2008, 485(1), 66—73
[15]	Zhang G., Guessasma S., Liao H., Coddet C., Bordes J. M., Surface and Coatings Technology, 2006, 200(8), 2610—2617
[16]	Tan S., Su A., Luo J., Zhou E., Polymer, 1999, 40(5), 1223—1231
[17]	Zhang G., Schlarb A. K., Wear, 2009, 266(1), 337—344
[18]	Myshkin N. K., Petrokovets M. I., Kovalev A. V., Tribol. Int., 2006, 38(11), 910—921