石墨烯-Cu/Ti6Al4V復(fù)合材料的制備及力學(xué)性能

石墨烯-Cu/Ti6Al4V復(fù)合材料的制備及力學(xué)性能Preparation and mechanical properties of GNPs-Cu/Ti6Al4V composites

采用表面無敏化、無活化的化學(xué)鍍銅法對(duì)石墨烯進(jìn)行表面鍍銅，并通過微波燒結(jié)法(燒結(jié)溫度為1000 ℃)制備石墨烯(GNPs)/Ti6Al4V、石墨烯(GNPs)-Cu/Ti6Al4V復(fù)合材料，探討石墨烯表面鍍銅后對(duì)鈦基復(fù)合材料顯微組織和性能的影響。結(jié)果表明：石墨烯表面成功鍍覆一層較均勻分布的銅顆粒，石墨烯與基體Ti界面反應(yīng)嚴(yán)重，容易生成粒徑為2~5 μm的TiC；石墨烯表面鍍銅后，界面反應(yīng)產(chǎn)生的TiC含量增多，同時(shí)引入了Ti2Cu相。相比于單純外加石墨烯，石墨烯表面鍍銅后，微量銅降低了燒結(jié)溫度，提高了復(fù)合材料的力學(xué)性能，其致密度、顯微硬度、壓縮強(qiáng)度分別達(dá)到96.55%、534HV0.1、1602MPa，室溫磨損機(jī)制由基體(Ti6Al4V)的磨粒磨損轉(zhuǎn)變?yōu)镚NPs-Cu/Ti6Al4V復(fù)合材料的粘著磨損。

The copper was plated on the surface of the graphene (GNPs) by chemical copper plating method without sensitization and activation, and the (GNPs)/Ti6Al4V and (GNPs)-Cu/Ti6Al4V composites were prepared by microwave sintering at 1000 ℃. The effects of copper plated GNPs on the microstructure and mechanical properites of Ti matrix composites were investigated. The results show that a layer of the uniform distribution of copper particles is successfully covered on the surface of GNPs. The severe interfacial reaction occurred between the GNPs and Ti, leading to the formation of TiC with the particle size of 2-5 μm. After copper plating, the TiC contents at the interface increase, and the new Ti2Cu phase is also generated. Compared to the (GNPs)/Ti6Al4V composites, the sintering temperature of the (GNPs)-Cu/Ti6Al4V decreases, while the mechanical properties is improved. The density, microhardness and compression strength of (GNPs)-Cu/Ti6Al4V can reach up to 96.55%, 534HV0.1 and 1602 MPa, respectively. At the same time, the wear mechanism changes from abrasive wear for Ti6Al4V sample to adhesive wear for (GNPs)-Cu/Ti6Al4V composites.

全文下載：https://pan.baidu.com/s/1pKCVEjh