Synthesis and Secondary Processing of High-Strength Aluminum Matrix Composites by Reactive Sintering

反应烧结高强度铝基复合材料的合成及二次加工

• 批准号: 15560619
• 负责人: TAKEDA Takenobu
• 金额: $ 2.05万
• 依托单位: Yamagata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560619/
• 关键词: Composite; Aluminum; Ceramics; Reactive Sintering; In-Situ Synthesis; Plastic Processing; Second Phase; Powder

Aluminum matrix composites reinforced with ceramic particulates (Al_2O_3, TiB_2 or TiC) were synthesized via reactive sintering of Al-B-TiO_2 or Al-C-Ti (TiO_2) three-component systems. The reactive paths, formation mechanism of reinforcing phases, microstructural evolution, densification, and plastic processing have been investigated systematically.For Al-B-TiO_2 three-component system, the reduction reaction of TiO_2 by molten Al has been proved to be a stepwise process. Four oxygen-deficient titanium oxides could be formed, and Ti_2O_3 was a main intermediate phase. In addition to the oxygen-deficient titanium oxides, there also existed several transitional phases, such as AlB_2, γ-Al_2O_3, and Al_3Ti during the reactive sintering process of Al-B-TiO_2 powder mixtures. As the reinforcements in the composites, Al_2O_3 was formed by a series of aluminothermic reactions, while the formation of TiB_2 depended to a large extent on AlB_2 transitional phase. Small-sized TiO_2 powder promot … More ed the formation of the reinforcing phases at lower temperatures, and the resultant reinforcing particulates exhibited smaller sizes, compared to large-sized TiO_2 powder.With regard to Al-C-Ti mixed powder, concurrent with the generation of TiC particulates, Al_3Ti phase was generally formed during the reactive sintering. In order to avoid the occurrence of Al_3Ti phase, sintering at a higher temperature, displacement of Ti by TiO_2, and addition of excess amount of C have been proved to be effective methods.It was shown that porous sintered specimens could be densified to a high-density level by hot compression. Furthermore, sound composite sheet could be obtained by hot rolling in a temperature range of 350-450℃. Because of the existence of submicron particulates which were homogeneously dispersed in Al matrix, the composites exhibited good mechanical properties, especially in strength and Young's modulus. In comparison with conventional powder metallurgy and various casting techniques, the reactive sintering process has been shown to be a promising approach to fabricate aluminum matrix composites reinforced with fine ceramic particulates. Less

采用Al-B-TiO_2或Al-C-Ti（TiO_2）三元体系反应烧结制备了Al_2O_3、TiB_2或TiC陶瓷颗粒增强铝基复合材料。系统研究了Al-B-TiO_2三元体系的反应路径、增强相的形成机理、组织演变、致密化和塑性加工过程，证明了Al熔体还原TiO_2的反应是一个分步过程。结果表明，在不同的反应条件下，可以形成四种缺氧型氧化钛，其中Ti_2O_3是主要的中间相。在Al-B-TiO_2混合粉末的反应烧结过程中，除贫氧钛氧化物外，还存在AlB_2、γ-Al_2O_3和Al_3Ti等过渡相。Al_2O_3作为复合材料中的增强相，是通过一系列铝热反应生成的，而TiB_2的生成在很大程度上取决于AlB_2过渡相。小粒径TiO_2粉体促进剂 ...更多信息 艾德在较低温度下促进了增强相的形成，与大尺寸TiO_2粉末相比，增强颗粒的尺寸较小。对于Al-C-Ti混合粉末，在反应烧结过程中，在生成TiC颗粒的同时，通常会形成Al_3 Ti相。为了避免Al_3Ti相的出现，提高烧结温度、用TiO_2置换Ti和添加过量的C是有效的方法。此外，在350-450℃的温度范围内进行热轧，可以获得良好的复合板材。由于亚微米颗粒的存在，使复合材料具有良好的力学性能，特别是强度和弹性模量。与传统的粉末冶金和各种铸造技术相比，反应烧结工艺已被证明是一种很有前途的方法来制备细陶瓷颗粒增强铝基复合材料。少

项目成果

In-Situ Formation of Reinforcements in Reactive Sintered Aluminum Matrix Composites

反应烧结铝基复合材料中增强材料的原位形成

• 发表时间: 2004
• 期刊: Transactions of Materials Research Society of Japan 29・8
• 作者: Z.-C.Chen;T.Takeda;A.Satoh;S.Kikuchi;K.Ikeda
• 通讯作者: K.Ikeda

Z.-C.Chen, T.Takeda, A.Satoh, S.Kikuchi, K.Ikeda: "In-Situ Formation of Reinforcements in Reactive Sintered Aluminum Matrix Composites"Transactions of Materials Research Society of Japan. 29(in press). (2004)

Z.-C.Chen、T.Takeda、A.Satoh、S.Kikuchi、K.Ikeda：“活性烧结铝基复合材料中增强材料的原位形成”日本材料研究学会汇刊。