Cu-Zr-Al非晶合金性能分析及其板材连铸技术研究
发布时间：2018-10-12 10:58
【摘要】：非晶合金具有独特的原子排列方式,因此具有多种优异的性能,如高强度、高硬度、良好的耐腐蚀性及耐磨能力、优异的磁性能和生物相容性。但是块体非晶合金受临界尺寸及制备工艺的制约,一直未能在工业上广泛应用。本文采用自主设计的铜模制备非晶合金多种形状非晶合金,利用X射线衍射仪、扫描电镜、DSC和DTA等设备及分析手段,研究了三种成分的Cu-Zr-Al三元非晶合金各项性能(热稳定性、硬度、耐腐蚀能力、耐摩擦磨损性能、细胞附着能力)。然后设计和制造了双室真空水平连铸设备,并使用该设备水平连铸纯铝板材对非晶合金板材连铸工艺进行初步探索。本文在对Cu40Zr50Al10.Cu47Zr45Al8和Cu50Zr42Al8三种非晶合金热稳定性研究时,发现其都具有较大的过冷液相区间(70K),具有很好的热稳定性。在硬度测试实验中发现Cu40Zr50Al10、Cu47Zr45A18和Cu50Zr42Al8三种非晶合金均具有较高的硬度(570HV),并且发现随Cu元素含量增加,非晶合金硬度增大。在电化学腐蚀实验中发现Cu50Zr42A18非晶合金在3.5%的NaCl溶液和0.5 mol/L的H2SO4溶液中自腐蚀倾向最小,并且三种非晶合金都有优异的耐腐蚀能力,根据实验结果可知随Cu元素含量增加,非晶合金耐腐蚀性能增强。在Cu40Zr50Al10、Cu47Zr45Al8和Cu50Zr42Al8非晶合金与Ti6A14V摩擦磨损对比实验中,发现非晶合金耐磨能力要优于Ti6A14V,其中Cu50Zr42Al8的耐磨能力最佳。还发现非晶合金随摩擦时间增长,摩擦机制由氧化磨损变为磨粒磨损；随着成分中Cu元素含量增加,非晶合金耐磨能力增强,与硬度随Cu含量变化趋势一致。细胞附着实验结果显示Cu40Zr50Al10非晶合金较另两种非晶合金具有较好的生物相容性,并得出增加Zr元素含量可以优化非晶合金生物相容性的结论。本文设计并制造了双室真空水平连铸设备,并使用其进行了非晶合金板材连铸工艺的初步探索。在对纯铝板材连铸时发现拉坯速度不能过大,拉坯速度过大影响板坯表面质量；双室压差对金属液充型有积极影响,有利于提高板坯表面质量；浇铸温度过高会对板坯表面质量产生不良影响。实验结果还显示,连铸后的铝板材铝含量为99.9319%高于原料的99.8564%,这说明连续铸造方式制备纯铝板材有利于提高产品中铝含量。本文最后利用纯铝板材连铸所探得的工艺,对Cu40Zr50Al10合金进行了板材连铸,制备出表面质量良好,尺寸达到50mmX 6mm X 300mm的Cu40Zr50Al10合金板材。
[Abstract]:Because of its unique atomic arrangement, amorphous alloys have many excellent properties, such as high strength, high hardness, good corrosion resistance and wear resistance, excellent magnetic properties and biocompatibility. However, the bulk amorphous alloys have not been widely used in industry due to the critical size and preparation process. In this paper, amorphous alloys with various shapes have been prepared by using a self-designed copper mold. The properties (thermal stability) of three kinds of Cu-Zr-Al ternary amorphous alloys have been studied by means of X-ray diffractometer, scanning electron microscope, DSC and DTA. Hardness, corrosion resistance, friction and wear resistance, cell adhesion). Then the double chamber vacuum horizontal continuous casting equipment is designed and manufactured, and the continuous casting process of amorphous alloy sheet is preliminarily explored by using the equipment for horizontal continuous casting of pure aluminum sheet. In this paper, the thermal stability of Cu40Zr50Al10.Cu47Zr45Al8 and Cu50Zr42Al8 amorphous alloys has been studied. It is found that both of them have a large supercooled liquid phase range (70K) and good thermal stability. It was found that both Cu40Zr50Al10,Cu47Zr45A18 and Cu50Zr42Al8 had higher hardness (570HV) in hardness test, and the hardness of amorphous alloy increased with the increase of Cu element content. In the electrochemical corrosion test, it was found that Cu50Zr42A18 amorphous alloy had the least corrosion tendency in 3.5% NaCl solution and 0.5 mol/L H2SO4 solution, and all three kinds of amorphous alloy had excellent corrosion resistance. According to the experimental results, it was found that the corrosion resistance of Cu50Zr42A18 amorphous alloy increased with the increase of Cu content. The corrosion resistance of amorphous alloy is enhanced. In the friction and wear experiments of Cu40Zr50Al10,Cu47Zr45Al8 and Cu50Zr42Al8 amorphous alloys with Ti6A14V, it is found that the wear resistance of amorphous alloys is better than that of Ti6A14V, in which Cu50Zr42Al8 has the best wear resistance. It was also found that the friction mechanism of amorphous alloy changed from oxidation wear to abrasive wear with the increase of friction time, and the wear resistance of amorphous alloy increased with the increase of Cu content in the composition, which was consistent with the change trend of hardness with Cu content. The results of cell adhesion test showed that Cu40Zr50Al10 amorphous alloy had better biocompatibility than the other two amorphous alloys, and it was concluded that increasing the content of Zr elements could optimize the biocompatibility of amorphous alloy. In this paper, a double chamber vacuum horizontal continuous casting equipment is designed and manufactured. In the continuous casting of pure aluminum sheet, it is found that the drawing speed can not be too large and the drawing speed is too big to affect the surface quality of slab, and the pressure difference between two chambers has a positive effect on the filling of metal liquid, which is beneficial to improve the surface quality of slab. High casting temperature will have a bad effect on the surface quality of slab. The results also show that the aluminum content of continuous casting aluminum sheet is 99.9319% higher than that of raw material 99.8564, which shows that the continuous casting method of pure aluminum plate is beneficial to improve the aluminum content in the product. In the last part of this paper, the Cu40Zr50Al10 alloy has been cast by using the process of continuous casting of pure aluminum sheet. The Cu40Zr50Al10 alloy sheet with good surface quality and size up to 50mmX 6mm X 300mm has been prepared.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG139.8
[Abstract]:Because of its unique atomic arrangement, amorphous alloys have many excellent properties, such as high strength, high hardness, good corrosion resistance and wear resistance, excellent magnetic properties and biocompatibility. However, the bulk amorphous alloys have not been widely used in industry due to the critical size and preparation process. In this paper, amorphous alloys with various shapes have been prepared by using a self-designed copper mold. The properties (thermal stability) of three kinds of Cu-Zr-Al ternary amorphous alloys have been studied by means of X-ray diffractometer, scanning electron microscope, DSC and DTA. Hardness, corrosion resistance, friction and wear resistance, cell adhesion). Then the double chamber vacuum horizontal continuous casting equipment is designed and manufactured, and the continuous casting process of amorphous alloy sheet is preliminarily explored by using the equipment for horizontal continuous casting of pure aluminum sheet. In this paper, the thermal stability of Cu40Zr50Al10.Cu47Zr45Al8 and Cu50Zr42Al8 amorphous alloys has been studied. It is found that both of them have a large supercooled liquid phase range (70K) and good thermal stability. It was found that both Cu40Zr50Al10,Cu47Zr45A18 and Cu50Zr42Al8 had higher hardness (570HV) in hardness test, and the hardness of amorphous alloy increased with the increase of Cu element content. In the electrochemical corrosion test, it was found that Cu50Zr42A18 amorphous alloy had the least corrosion tendency in 3.5% NaCl solution and 0.5 mol/L H2SO4 solution, and all three kinds of amorphous alloy had excellent corrosion resistance. According to the experimental results, it was found that the corrosion resistance of Cu50Zr42A18 amorphous alloy increased with the increase of Cu content. The corrosion resistance of amorphous alloy is enhanced. In the friction and wear experiments of Cu40Zr50Al10,Cu47Zr45Al8 and Cu50Zr42Al8 amorphous alloys with Ti6A14V, it is found that the wear resistance of amorphous alloys is better than that of Ti6A14V, in which Cu50Zr42Al8 has the best wear resistance. It was also found that the friction mechanism of amorphous alloy changed from oxidation wear to abrasive wear with the increase of friction time, and the wear resistance of amorphous alloy increased with the increase of Cu content in the composition, which was consistent with the change trend of hardness with Cu content. The results of cell adhesion test showed that Cu40Zr50Al10 amorphous alloy had better biocompatibility than the other two amorphous alloys, and it was concluded that increasing the content of Zr elements could optimize the biocompatibility of amorphous alloy. In this paper, a double chamber vacuum horizontal continuous casting equipment is designed and manufactured. In the continuous casting of pure aluminum sheet, it is found that the drawing speed can not be too large and the drawing speed is too big to affect the surface quality of slab, and the pressure difference between two chambers has a positive effect on the filling of metal liquid, which is beneficial to improve the surface quality of slab. High casting temperature will have a bad effect on the surface quality of slab. The results also show that the aluminum content of continuous casting aluminum sheet is 99.9319% higher than that of raw material 99.8564, which shows that the continuous casting method of pure aluminum plate is beneficial to improve the aluminum content in the product. In the last part of this paper, the Cu40Zr50Al10 alloy has been cast by using the process of continuous casting of pure aluminum sheet. The Cu40Zr50Al10 alloy sheet with good surface quality and size up to 50mmX 6mm X 300mm has been prepared.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG139.8
【共引文献】
相关期刊论文 前10条
1 伍增勇;彭娅;童荣柏;王柯;;PVP在医用聚氨酯表面润滑改性中的研究及应用[J];工程塑料应用;2010年03期
2 叶迅;赵元立;朱琳;唐光昕;李朝征;李京生;于书卿;赵继宗;;颅骨修补材料钛金属表面梯度生物活性涂层的生物相容性研究[J];北京医学;2008年01期
3 周丽，
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