Properties of Nano-composite Powders of NiCrCoAlY-TiB2 Prepared by High Energy Ball Milling for High Velocity Air Fuel Spraying

doi:10.11901/1005.3093.2016.512

Chinese Journal of Materials Research

2017, Vol. 31

Issue (6): 465-471 DOI: 10.11901/1005.3093.2016.512

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Properties of Nano-composite Powders of NiCrCoAlY-TiB₂ Prepared by High Energy Ball Milling for High Velocity Air Fuel Spraying

Jizhong WANG^1,²,Xiaozhou CHE¹,Yaosha WU²,Gang WANG^1,²,Hongya YU^1,²,Dechang ZENG¹(

)

1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
2. Gent Materials Surface Technology (Guangdong) Co., Ltd, Zhongshan 528437, China

Cite this article:

Jizhong WANG,Xiaozhou CHE,Yaosha WU,Gang WANG,Hongya YU,Dechang ZENG. Properties of Nano-composite Powders of NiCrCoAlY-TiB₂ Prepared by High Energy Ball Milling for High Velocity Air Fuel Spraying. Chinese Journal of Materials Research, 2017, 31(6): 465-471.

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Abstract

Flowability is a prerequisite for the applicability of powders for thermal spraying. Nanoscale feedstock of NiCrCoAlY-TiB₂MMCs (metal matrix composites) was synthesized by high energy ball milling method with NiCrCoAlY and TiB₂ powders as raw material, and argon as shielding gas. The milled powder was characterized by scanning electron microscope, X-ray diffraction, apparent density tester, tap-density tester, repose angle tester and laser scattering. The results show that after wet-milled at 320 r/min for 20 h and dry-milled at 220 r/min for 5 h, a stable nanoscale feedstock of NiCrCoAlY-TiB₂ MMCs was obtained. The particle size ranges from 5 to 50 μm and a majority of the powders shows ellipsoidal morphology which is expected to have good fluidity during HVOF spraying. Compared with the initial mixed powders, the repose angle of milled powders reduces from 38.4° to 32.9°, HR value reduces from 1.925 to 1.248, indicating the flowability has been improved obviously.

Key words: composite NiCrCoAlY-TiB2 nanostructured feedstock high energy ball milling cermet nano-powder

Received: 29 August 2016

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	Jizhong WANG
	Xiaozhou CHE
	Yaosha WU
	Gang WANG
	Hongya YU
	Dechang ZENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.512 OR https://www.cjmr.org/EN/Y2017/V31/I6/465

Table 1 Chemical compositions of coating material TiB₂ and NiCrCoAlY (%, mass fraction)

Table 2 The relationship among compressibility, flowability and HR value

Fig.1 SEM images of (a) TiB₂ powders, (b) NiCrCoAlY powders and (c) mechanical mixture powders

Fig.2 SEM images of NiCrCoAlY-TiB₂ composite powders after (a, b) 5 h, (c, d) 10 h, (e, f) 20 h of ball milling and (g) cross-sectional SEM image, (h) after sieving

Fig.3 SEM images of NiCrCoAlY-TiB₂ single agglomeration particle after (a) high energy ball milling and (b) its local magnification image

Fig.4 XRD spectra for powders milled for (a) 0 h, (b) 10 h, (c) 20 h

Fig.5 Particle size distribution in ball milled powder samples

Fig.6 The angle of repose/tapped density/bulk density/HR value of powders in different ball milling conditions

Fig.7 Grain size and lattice strain distributions of NiCrCoAlY-TiB₂ powders after high energy ball milling

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