Surface Modification of SiC Powders in Vitrified Grinding Wheel by In-situ Sol-gel Method

doi:10.11901/1005.3093.2016.494

Chinese Journal of Materials Research

2017, Vol. 31

Issue (9): 659-664 DOI: 10.11901/1005.3093.2016.494

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Surface Modification of SiC Powders in Vitrified Grinding Wheel by In-situ Sol-gel Method

Yingying LIU, Long WAN(

), Junsha WANG

College of Materials Science and Engineering , Hunan University, Changsha 410082, China

Cite this article:

Yingying LIU, Long WAN, Junsha WANG. Surface Modification of SiC Powders in Vitrified Grinding Wheel by In-situ Sol-gel Method. Chinese Journal of Materials Research, 2017, 31(9): 659-664.

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Abstract

KH550 silane coupling was used as surfactant to modify the surface of SiC powders. The morphology, surface property and particle size distribution of SiC powders before and after modification were investigated by scanning electron microscope, X-ray diffractometer, laser particle analyzer and infrared spectroscopy. Results show that the surface of SiC powders was coated with a thin layer of KH550 via grafting reaction, which did not change phase constituent and structure of the SiC powders. After modification, the agglomeration of powders alleviated , and thus their average size also decreased. Due to the increase of electrostatic repulsion and steric hindrance among SiC powders, the suspensibility and dispersibility of powders in sol were improved. To simulate the production of vitrified grinding wheel of SiC/ceramic composite, simulate sintered compacts of SiC/ceramic composite were fabricated comparatively with plain- and the modified-SiC by means of a twostep process: forming by in-situ sol-gel method and then sintering at desired temperature. It follows that the produced sintered compact with the modified SiC shows better uniformity in microstructure and higher bending strength as well.

Key words: inorganic vitrified materials surface modification silane coupling SiC dispersibility Bend strength

Received: 22 August 2016

ZTFLH:

TB332

Fund: Supported by National Natural Science Foundation of China (No.51375157)

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	Yingying LIU
	Long WAN
	Junsha WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.494 OR https://www.cjmr.org/EN/Y2017/V31/I9/659

Table 1 Formula of the vitrified bond (%, mol)

Fig.1 IR of SiC powder before and after modified (a) unmodified SiC powder; (b) modified SiC powder

Fig.2 XRD patterns of SiC powder before and after modified

Fig.3 Particle size distribution of SiC power before and after modified (a) unmodified SiC; (b) 1.5 g KH550; (c) 2.5 g KH550; (d) 3.5 g KH550

Table 2 Particle size distribution of SiC power before and after modified

Fig.4 Settlements of SiC power modified by KH550 with different mass fractions in sol after standing 4 h (a) unmodified SiC powders; (b) 1.5 g KH550; (c) 2.5 g KH550; (d) 3.5 g KH550

Fig.5 SEM photographs of SiC powder before and after modified (a) unmodified SiC powder; (b) modified SiC powder

Fig.6 Fracture images of composites with before and after modified (a) unmodified SiC powder; (b) modified SiC powder

Table 3 Properties of composites with before and after modified

Fig.7 Bend strength and hardness of composites with before and after modified

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