溶胶凝胶原位成型陶瓷结合剂砂轮中碳化硅的改性

doi:10.11901/1005.3093.2016.494

材料研究学报

2017, Vol. 31

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

研究论文

本期目录 | 过刊浏览

溶胶凝胶原位成型陶瓷结合剂砂轮中碳化硅的改性

刘莹莹, 万隆(

), 王俊沙

湖南大学材料科学与工程学院长沙 410082

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

引用本文:

刘莹莹, 万隆, 王俊沙. 溶胶凝胶原位成型陶瓷结合剂砂轮中碳化硅的改性[J]. 材料研究学报, 2017, 31(9): 659-664.
Yingying LIU, Long WAN, Junsha WANG. Surface Modification of SiC Powders in Vitrified Grinding Wheel by In-situ Sol-gel Method[J]. Chinese Journal of Materials Research, 2017, 31(9): 659-664.

全文: PDF(1016 KB) HTML

摘要:

使用硅烷偶联剂KH550作为表面活性剂对碳化硅微粉表面进行改性,使用扫描电镜、X射线衍射仪、激光粒度分析仪和红外光谱仪等手段研究了改性前后微粉的形貌、表面性质、粒度分布及烧结体微观形貌。结果表明,硅烷偶联剂与碳化硅通过接枝反应在其表面形成包覆层,但是不改变其物相和结构。改性后碳化硅微粉的团聚减少,因此平均粒径减小;颗粒间的静电斥力和空间位阻增大,改善了碳化硅颗粒在溶胶中的悬浮稳定性和分散性。与未改性的SiC相比,用溶胶凝胶原位成型SiC/陶瓷复合材料改性后SiC与陶瓷的烧结体结构均匀,抗弯强度较高。

关键词 ：无机陶瓷材料, 表面改性, 硅烷偶联剂, 碳化硅, 分散性, 抗弯强度

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

收稿日期: 2016-08-22

ZTFLH:

TB332

基金资助:国家自然科学基金(51375157)

作者简介:

作者简介刘莹莹,女,1990年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.494 或 https://www.cjmr.org/CN/Y2017/V31/I9/659

表1 陶瓷结合剂配方(%)

图1 改性前后碳化硅微粉的IR光谱分析

图2 改性前后SiC微粉的XRD图谱

图3 改性前后SiC微粉粒径分布

表2 经KH550改性前后SiC微粉粒径分布

图4 不同质量的KH550改性碳化硅在溶胶中静置4 h后的沉降情况

图5 改性前后SiC微粉的SEM照片

图6 改性前后SiC/陶瓷烧结体的断面形貌图

表3 改性前后SiC/陶瓷烧结体的性能

图7 改性前后SiC/陶瓷烧结体的抗弯强度和硬度

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