**弥散型Al-Ti-C中间合金
一、产品适用场合 Al-Ti-C中间合金适用于变形铝加工行业,铝合金、锌合金和镁合金铸造行业。 1、能清理铝板、管、棒锭中的羽毛晶、浮游晶、柱状晶、裂纹、表面起皮、断面晶粒度不均匀、穿孔和偏析等缺陷。显著提高铝材的强韧性、均匀性、致密性、耐蚀性、加工工艺性和表面质量等。 2、克服含TiB2细化剂的不足,提高箔材的质量。 不适用于Si≥7%的铝合金;在细化含Zr铝合金时,需要与特殊工艺相配合。二、产品背景
晶粒的微细化能显著提高合金的强韧性、耐蚀性和加工工艺性等。Al-Ti-B中间合金目前被广泛地用于铝合金的晶粒细化。但随着对铝制品质量要求的不断提高,它在应用过程中也逐渐暴露出以下缺点: 1、Al-Ti-B中的TiB2粒子尺寸非常大(0.5-3微米),较易聚集成团,阻塞过滤器,并导致许多缺陷:如在铝印刷基板上出现轴线条纹,在铝箔上出现穿孔等。2、TiB2形核率低(小于1%),99%以上以杂质形式存在。3、随着对铝材质量要求的不断提高,要求铝合金晶粒尺寸越来越小。 研究表明,TiC显示出较小的尺寸(1μm以下)、较低的聚集倾向和较高的形核率,特别是“弥散型Al-Ti-C中间合金”。三、产品特点 1、TiC为亚微米尺度,平均尺寸≤500nm; 2、TiC颗粒呈弥散分布; 3、TiC形核率高,Al-5Ti-0.35C中TiC的形核率是TiB2的5倍以上;4、细化效果显著,有效果快,加入后1分钟即达到理想的变质效果;
图1. Al-5Ti-0.25C中间合金微观
0min 5min 15min 30min图2. Al-5Ti-0.25C中间合金对纯铝细化效果四、产品规格根据成分不同分为:Al-10Ti-1C、Al-5Ti-0.5C、Al-5Ti-0.35C、Al-5Ti-0.25C、Al-8Ti-2C和Al-3Ti-0.15C等。以Ф9.5的杆状和锭状两种产品为主。表1. Al-Ti-C中间合金规格及适用范围
型 号 | Ti | C | 杂质总量 | 适 用 |
AlTi5C0.5 | 4.6-5.4 | 0.4-0.6 | ≤ 0.6 | 变形铝合金的细化处理,铝合金、锌合金和镁合金铸造行业 |
AlTi5C0.25 | 4.6-5.4 | 0.2-0.3 | ≤ 0.6 |
AlTi3C0.15 | 4.2-4.8 | 0.1-0.2 | ≤ 0.6 |
Al-2Ti-0.8C | 1.5-2.5 | 0.55-1.0 | |
Al-1Ti-0.6C | 0.6-1.5 | 0.30-0.80 | |
五、技术支持
相关技术已授权国家发明3项。围绕应用基础工作发表了系列学术论文,对Al-Ti-C中间合金的使用提供了技术支持。
主要论文如下: 1. Ding Haimin, Liu Xiangfa, Yu Lina. The influence of forming processes on the distribution and morphologies of TiC in Al–Ti–C master alloys, Scripta Materialia, 2007; 57: 575-578 2. Haimin Ding, Xiangfa Liu, Lina Yu. Influence of zirconium on grain refining efficiency of Al–Ti–C master alloys, Journal of Material Science, 2007; 42:9817–9821 3. Yu Lina, Liu Xiangfa, Wang Zhenqing, Liu Jianwen. Instability of TiC and TiAl3 compounds in Al-10Mg and Al-5Cu alloys by addition of Al-Ti-C master alloy, Journal of University of Science and Technology Beijing: Mineral Metallurgy Materials (Eng Ed), 2006; 13(2) : 145-148 4. Wang Zhenqing,Liu Xiangfa, Bian Xiufang. Reaction in the Al-TiO2-CB4 System and in Situ Synthesis of an Al/(TiC TiB2 a-Al2O3) Composite. Advanced Engineering Materials,2004; 6(12): 276-281 5. Wang Zhenqing,Liu Xiangfa, Zhang Junyan and Bian Xiufang. The Reaction Mechanism in Al-C Binary System Through DSC and XRD,Journal of Materials Science,2004;39(6): 2179-2181 6. Wang Zhenqing, Liu Xiangfa and Bian Xiufang. Reaction mechanism in an Al-TiO2-C system for producing in-situ Al/(TiC Al2O3) composite, Journal of Materials Science 2004;39(2):663-666 7. Liu Yanhui, Liu Xiangfa,Bian Xiufang.Grain refinement of Mg-Al alloys with Al4C3-SiC/Al master alloy, Materials Letters,2004;58( 7-8):1282-1287 8. Wang Zhenqing, Liu Xiangfa and Bian Xiufang. Microstructure and its influence on refining performance of AlTiC master alloys, Materials Science and Technology, 2003;19 (12):1709-1714 9. Wang Zhenqing, Liu Xiangfa and Bian Xiufang. Reaction mechanism in the ball-milled Al-C powders, Journal of Materials Science Letters,2003; 22:1427-1429 10. Liu Xiangfa, Wang Zhenqing, Zhang Zuogui, Bian Xiufang. The Relationship between Microstructures and Refining Performances of Al-Ti-C Master Alloys. Materials Science and Engineering A, 2002; A332: 70-74 11. 张作贵,刘相法,边秀房. Al-Ti-C系中TiC形成热力学及动力学,金属学报, 2000; 36(10): 1025-1029 12. 王振卿,刘相法,边秀房. 制备多物相AlTiC合金的Ti与C熔体反应法, 中国有色金属学报, 2003; 13(6):1407-1413 13. 柳延辉,刘相法,李挺宾,边秀房,张均艳. Al-Ti-C中间合金对Mg-Al合金的晶粒细化作用,中国有色金属学报,2003;(3):622-62514. 柳延辉,刘相法. TiC/Al和SiC/Al中间合金对Mg-Al系合金晶粒的细化,铸造,2003;52(7):472-47 15. 于丽娜,刘相法,乔进国,边秀房. Al-Ba中间合金及其对共晶Al-Si合金的变质处理,铸造,2003;52(8):613-615 16. 柳延辉,李挺宾,刘相法,王振卿,韩延峰,边秀房. 微量Mg、Si对AlTiC中间合金细化效果的促进作用,铸造,2002;51(50):599- 602