微波烧结原位合成<strong>TiC</strong>增强钛复合材料的性能

doi:10.11901/1005.3093.2020.166

材料研究学报

2021, Vol. 35

Issue (4): 277-283 DOI: 10.11901/1005.3093.2020.166

研究论文

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微波烧结原位合成TiC增强钛复合材料的性能

胡满银¹, 欧阳德来¹(

), 崔霞¹, 杜海明², 徐勇¹

^1.南昌航空大学材料科学与工程学院南昌 330063
^2.江西师范大学南昌 330022

Properties of TiC Reinforced Ti-Composites Synthesized in Situ by Microwave Sintering

HU Manying¹, OUYANG Delai¹(

), CUI Xia¹, DU Haiming², XU Yong¹

^1.School of Materials Science and Engineering, Nanchang Hangkong University, Jiangxi 330063, China
^2.Jiangxi Normal University, Jiangxi 330022, China

引用本文:

胡满银, 欧阳德来, 崔霞, 杜海明, 徐勇. 微波烧结原位合成TiC增强钛复合材料的性能[J]. 材料研究学报, 2021, 35(4): 277-283.
Manying HU, Delai OUYANG, Xia CUI, Haiming DU, Yong XU. Properties of TiC Reinforced Ti-Composites Synthesized in Situ by Microwave Sintering[J]. Chinese Journal of Materials Research, 2021, 35(4): 277-283.

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摘要:

以纳米管(MWCNTs)和纯钛为原料，用微波烧结法原位合成TiC增强钛基复合材料，研究了这种材料的组织和性能并探讨了TiC增强相的生成机理。结果表明，微波烧结时MWCNTs与Ti原位生成TiC增强相。MWCNTs的添加量(质量分数，下同)低于1%时TiC呈现颗粒状且分布均匀，Ti基体致密；MWCNTs的添加量高于1.5%时TiC呈树枝晶形貌，Ti基体的组织粗化使复合材料出现较多的孔洞。MWCNTs的添加使材料由粘着磨损为主转变为磨粒磨损为主。随着MWCNTs添加量的提高，复合材料的显微硬度先提高后降低。MWCNTs添加量为1%的复合材料显微硬度最高(约为527HV)、耐磨性能最好(摩擦系数约为0.35)。与纯钛相比，TiC增强钛基复合材料的显微硬度提高了1.2倍，摩擦系数降低了0.4。

关键词 ：复合材料, 微波烧结, TiC, 原位合成, TiC增强钛基复合材料

Abstract：

Novel TiC reinforced Ti-based composites were synthesized via in situ microwave sintering with nanotubes (MWCNTs) and pure Ti as raw materials. The properties of the composites were investigated, and the formation mechanism of TiC reinforced phase of the composites was discussed. The results show that TiC reinforced phase could be generated in-situ in the Ti-matrix during microwave sintering. When the addition amount of MWCNTs <1% (in mass fraction), the formed TiC was granular-like and distributed uniformly in the dense Ti matrix of fine grains. When the addition amount of MWCNTs >1.5%, the formed TiC turns to be of dendritic morphology, while the Ti matrix is coarsened and the composite becomes porous. Sequentially, the wear mechanism of the composites will change from adhesive wear to abrasive wear due to the addition of MWCNTs. With the increasing addition amount of MWCNTs the microhardness of the composite increases firstly and then decreases. When the addition amount of MWCNTs is 1%, the acquired composite presents a higher microhardness of about 527HV and better wear resistance with the friction coefficient of about 0.35, which are 1.2 times more and 0.4 less than the corresponding terms of the pure Ti respectively.

Key words： composites microwave sintering TiC in situ synthesis TiC reinforced titanium composites

收稿日期: 2020-05-18

ZTFLH:

TG146

基金资助:国家自然科学基金(51761029)

作者简介: 胡满银，女，1994年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.166 或 https://www.cjmr.org/CN/Y2021/V35/I4/277

图1 制备钛基复合材料用原材料

图2 实验流程

图3 MWCNTs的添加量对TiC增强钛复合材料微观组织的影响

图4 不同MWCNTs添加量TiC增强钛复合材料的XRD谱

图5 TiC增强钛复合材料中两类TiC的形貌

图6 MWCNTs添加量对TiC增强钛复合材料相对密度的影响

图7 MWCNTs添加量对TiC增强钛复合材料硬度的影响

图8 不同MWCNTs添加量复合材料的摩擦因数与时间的关系

图9 不同MWCNTs添加量TiC增强钛复合材料的平均摩擦因数和磨损体积

图10 纯钛基体和不同MWCNTs添加量TiC增强钛复合材料的磨损微观形貌

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