**彌散型Al-Ti-C中間合金
一、產(chǎn)品適用場(chǎng)合 Al-Ti-C中間合金適用于變形鋁加工行業(yè),鋁合金、鋅合金和鎂合金鑄造行業(yè)。 1、能清理鋁板、管、棒錠中的羽毛晶、浮游晶、柱狀晶、裂紋、表面起皮、斷面晶粒度不均勻、穿孔和偏析等缺陷。顯著提高鋁材的強(qiáng)韌性、均勻性、致密性、耐蝕性、加工工藝性和表面質(zhì)量等。 2、克服含TiB2細(xì)化劑的不足,提高箔材的質(zhì)量。 不適用于Si≥7%的鋁合金;在細(xì)化含Zr鋁合金時(shí),需要與特殊工藝相配合。二、產(chǎn)品背景
晶粒的微細(xì)化能顯著提高合金的強(qiáng)韌性、耐蝕性和加工工藝性等。Al-Ti-B中間合金目前被廣泛地用于鋁合金的晶粒細(xì)化。但隨著對(duì)鋁制品質(zhì)量要求的不斷提高,它在應(yīng)用過程中也逐漸暴露出以下缺點(diǎn): 1、Al-Ti-B中的TiB2粒子尺寸非常大(0.5-3微米),較易聚集成團(tuán),阻塞過濾器,并導(dǎo)致許多缺陷:如在鋁印刷基板上出現(xiàn)軸線條紋,在鋁箔上出現(xiàn)穿孔等。2、TiB2形核率低(小于1%),99%以上以雜質(zhì)形式存在。3、隨著對(duì)鋁材質(zhì)量要求的不斷提高,要求鋁合金晶粒尺寸越來越小。 研究表明,TiC顯示出較小的尺寸(1μm以下)、較低的聚集傾向和較高的形核率,特別是“彌散型Al-Ti-C中間合金”。三、產(chǎn)品特點(diǎn) 1、TiC為亞微米尺度,平均尺寸≤500nm; 2、TiC顆粒呈彌散分布; 3、TiC形核率高,Al-5Ti-0.35C中TiC的形核率是TiB2的5倍以上;4、細(xì)化效果顯著,有效果快,加入后1分鐘即達(dá)到理想的變質(zhì)效果;
圖1. Al-5Ti-0.25C中間合金微觀
0min 5min 15min 30min圖2. Al-5Ti-0.25C中間合金對(duì)純鋁細(xì)化效果四、產(chǎn)品規(guī)格根據(jù)成分不同分為: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的桿狀和錠狀兩種產(chǎn)品為主。表1. Al-Ti-C中間合金規(guī)格及適用范圍
型 號(hào) | Ti | C | 雜質(zhì)總量 | 適 用 |
AlTi5C0.5 | 4.6-5.4 | 0.4-0.6 | ≤ 0.6 | 變形鋁合金的細(xì)化處理,鋁合金、鋅合金和鎂合金鑄造行業(yè) |
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、技術(shù)支持
相關(guān)技術(shù)已授權(quán)國(guó)家發(fā)明3項(xiàng)。圍繞應(yīng)用基礎(chǔ)工作發(fā)表了系列學(xué)術(shù)論文,對(duì)Al-Ti-C中間合金的使用提供了技術(shù)支持。
主要論文如下: 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. 張作貴,劉相法,邊秀房. Al-Ti-C系中TiC形成熱力學(xué)及動(dòng)力學(xué),金屬學(xué)報(bào), 2000; 36(10): 1025-1029 12. 王振卿,劉相法,邊秀房. 制備多物相AlTiC合金的Ti與C熔體反應(yīng)法, 中國(guó)有色金屬學(xué)報(bào), 2003; 13(6):1407-1413 13. 柳延輝,劉相法,李挺賓,邊秀房,張均艷. Al-Ti-C中間合金對(duì)Mg-Al合金的晶粒細(xì)化作用,中國(guó)有色金屬學(xué)報(bào),2003;(3):622-62514. 柳延輝,劉相法. TiC/Al和SiC/Al中間合金對(duì)Mg-Al系合金晶粒的細(xì)化,鑄造,2003;52(7):472-47 15. 于麗娜,劉相法,喬進(jìn)國(guó),邊秀房. Al-Ba中間合金及其對(duì)共晶Al-Si合金的變質(zhì)處理,鑄造,2003;52(8):613-615 16. 柳延輝,李挺賓,劉相法,王振卿,韓延峰,邊秀房. 微量Mg、Si對(duì)AlTiC中間合金細(xì)化效果的促進(jìn)作用,鑄造,2002;51(50):599- 602