Abstract

Based on low density, Mg metal-based composites exhibit high specific mechanical properties and are actively used for weight critical structural application. In the present study, Mg-matrix based TiO₂/Al₂O₃ composite materials were synthesized by using the powder metallurgy (Solid-phase) technique. Parameters such as the concentration of the components, temperature, and pressure were optimized before experiments. Different conditions such as temperature (30 °C) and pressure (760 mm of Hg) were also optimized. Pellets of the Mg-based composites and their pure constituent counterparts of various diameters (10–20 cm) were prepared under 50 tons of hydraulic pressure. Single-phase homogenous composites were obtained by undertaking the pellets through sintering in an electric furnace at elevated temperature (600 °C) for 1 h. The prepared materials were tested for different properties using various physicochemical techniques such as Fourier transform infrared spectroscopy (FTIR), Scanning electronic microscopy (SEM), X-ray diffraction (XRD) and Surface area analyzer. FTIR results confirmed composite formation. SEM revealed microstructures of all materials in the µm range. XRD proved the phase-distribution and crystallinity of the prepared materials. It was found that 2 and 3-component systems are homogenized when prepared by the powder metallurgy technique. The surface area of all materials was confirmed using the BET adsorption isotherm equation. The surface area of the prepared composites was found to be in the range from 40 to 70 m²/g. Such properties enable these materials for potential application in solar reflectance and as a catalyst in liquid phase hydrogenation.

Graphic Abstract

中文翻译：

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Mg基TiO 2 / Al 2 O 3复合材料的合成与表征

摘要

基于低密度的镁金属基复合材料表现出高的比机械性能，并被积极地用于重量关键的结构应用。在本研究中，基于镁基的TiO ₂ / Al ₂ O ₃粉末冶金（固相）技术合成了复合材料。在实验之前，对诸如组分的浓度，温度和压力之类的参数进行了优化。还优化了不同的条件，例如温度（30°C）和压力（760毫米汞柱）。在50吨的液压压力下，制备了各种直径（10–20 cm）的Mg基复合材料的球粒及其纯组分。通过在高温（600℃）下在电炉中烧结粒料1小时，获得单相均质复合材料。使用多种物理化学技术（例如傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM），X射线衍射（XRD）和表面积分析仪。FTIR结果证实了复合物的形成。SEM显示所有材料的微结构都在µm范围内。XRD证明了所制备材料的相分布和结晶性。发现通过粉末冶金技术制备时，2组分体系和3组分体系是均质的。使用BET吸附等温线方程确认所有材料的表面积。发现所制备的复合材料的表面积为40至70m。使用BET吸附等温线方程确认所有材料的表面积。发现所制备的复合材料的表面积为40至70m。使用BET吸附等温线方程确认所有材料的表面积。发现所制备的复合材料的表面积为40至70m。² /克。这些性能使这些材料有可能在太阳反射中应用，并在液相加氢中用作催化剂。

图形摘要