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首页> 外文期刊>Rapid prototyping journal >Blending of iron and silicon carbide powders for producing metal matrix composites by laser sintering process
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Blending of iron and silicon carbide powders for producing metal matrix composites by laser sintering process

机译：铁和碳化硅粉末的共混物，用于通过激光烧结工艺生产金属基复合材料

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Purpose - The purpose of this paper is to study the effect of blending time, SiC content and fill ratio on the homogeneity of iron-silicon carbide powder mixture, blended in double-cone blender; to evaluate density, microstructure and micro hardness of laser sintered iron and iron-SiC specimens; and study the feasibility of building a complex iron-SiC metal matrix composite (MMC) part by direct metal laser sintering (DMLS) process. Design/methodology/approach - The morphology and particle size of iron and silicon carbide powders were evaluated. Nickel coating was carried out on silicon carbide particles. Blending of iron-SiC powders were carried out in two phases in a double-cone blending equipment. In the first phase, three tests were conducted with fill ratios (ratio of volume of conical blender to volume of powder mixture) of 1.68, 3.39, and 6.8 percent while iron-SiC weight ratio was kept constant at 97:3. In the second phase, four tests were conducted with iron-SiC weight ratios of 99:1, 98:2, 97:3, and 95:5 while keeping a constant fill ratio of 1.68 percent. In both the phases, blending was carried out for duration of 43 minutes. Homogeneity of the powder mixture was evaluated at different intervals of time by adopting sampling process. Sintering was carried out on iron and iron-SiC powder mixture using DMLS machine at laser speed of 50, 75, 100, and 125 mm/s. Microstructure, density and micro hardness studies were carried out on the sintered specimens. A 3D model of a part with complex geometry was modeled using Unigraphics CAD/CAM software and prototype part was built by DMLS technology using the blended iron-2 weight percent SiC powder. Findings - A reduction in blending time was observed with increase in SiC content and decrease in fill ratio. Microstructure and micro hardness tests conducted on laser sintered iron-silicon carbide specimens, reveal the homogeneity of blended powder. The density of the iron-SiC composites sintered at a laser speed of 50 and 75 mm/s, decreased with increase in SiC content. Further, an increase in the micro hardness of iron-SiC composites was observed with increase in SiC content and decrease in laser speed. Complex functional part was built by DMLS technology with out any supports. Research limitations/implications - The experiments were conducted with standard blending equipment in which the speed is limited to 48 revolutions per minute only. Originality/value - Meager information is available on blending of powders for producing MMCs by laser sintering process. The work presented in this paper will be a guideline for researchers to carry out further work in blending of powders for producing MMCs by rapid prototyping process.
机译：目的-本文的目的是研究混合时间，SiC含量和填充比对在双锥混合机中混合的铁-碳化硅粉末混合物均匀性的影响;评估激光烧结铁和铁-SiC样品的密度，显微组织和显微硬度;并研究了通过直接金属激光烧结（DMLS）工艺制造复合铁-SiC金属基复合材料（MMC）零件的可行性。设计/方法/方法-评估了铁和碳化硅粉末的形态和粒度。在碳化硅颗粒上进行镍涂层。在双锥混合设备中分两阶段进行铁-SiC粉末的混合。在第一阶段中，进行了三项测试，填充比（锥形混合器的体积与粉末混合物的体积之比）为1.68％，3.39％和6.8％，而铁-SiC重量比保持恒定在97：3。在第二阶段，进行了四个测试，其中铁-SiC的重量比为99：1、98：2、97：3和95：5，同时保持1.68％的恒定填充率。在这两个阶段中，共混进行了43分钟。通过采样过程，在不同的时间间隔评估粉末混合物的均质性。使用DMLS机器以50、75、100和125mm / s的激光速度对铁和铁-SiC粉末混合物进行烧结。在烧结后的样品上进行了显微组织，密度和显微硬度的研究。使用Unigraphics CAD / CAM软件对具有复杂几何形状的零件的3D模型进行建模，并使用DMLS技术使用铁含量为2重量％的混合SiC粉末来制造原型零件。发现-随着SiC含量的增加和填充率的降低，共混时间减少。在激光烧结的铁-碳化硅样品上进行的显微组织和显微硬度测试显示了混合粉末的均质性。随着SiC含量的增加，以50mm / s和75mm / s的激光速度烧结的铁-SiC复合材料的密度降低。此外，随着SiC含量的增加和激光速度的降低，观察到铁-SiC复合材料的显微硬度增加。复杂的功能部件是由DMLS技术构建的，没有任何支持。研究局限性/意义-实验是使用标准混合设备进行的，其速度仅限于每分钟48转。原创性/价值-微不足道的信息可用于通过激光烧结工艺共混用于生产MMC的粉末。本文中提出的工作将为研究人员提供指导，以开展进一步的工作，以进行粉末共混以通过快速原型制造工艺生产MMC。

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