关于钴铬合金激光焊接穿透深度的研究

发布时间：2018-04-25 04:20

本文选题：钴铬合金 + 穿透深度　；参考：《南京大学》2016年硕士论文

【摘要】：[研究背景]钴铬合金因为优异的机械性能、生物相容性以及经济性,而广泛地应用于口腔内各种修复体的制作。对于长跨度的金属固定桥修复体,为了提高修复体的最终精度,通过将其分段铸造后进行焊接来完成制作。可摘局部义齿的铸造支架损坏后,能否完成焊接的修理关系到修复体的使用寿命。但对于不同的修复类型有着不同的焊接需求,固定桥连接体部分通常有4-10mm2的面积,可摘局部义齿支架厚度为1mm,这两种修复体分别需要1-2mm、0.5-1mm的焊接的穿透深度。激光焊接技术在牙科工艺领域的引入,更好地解决上述问题成为可能。激光焊接与传统的焊接方法(如电弧焊、电阻焊)相比,具有无需包埋、操作便捷,热影响区小等优点,使其在口腔领域应用广泛。[研究目的]目前研究表明,激光焊接技术尽管具有以上优点,但也存在一些问题,如焊接参数不明确,造成了激光焊接在临床上应用的困扰,为了解决这一问题,本试验的目的是通过对不同的激光焊接参数下,对钴铬合金激光焊接后,测定激光穿透深度,揭示各因素与穿透深度之间的相互关系,为临床应用时的参数选择提供参考。[实验方法]制作48个6.0 mm×6.0 mm×10 mm3有机玻璃块作为铸件,安插铸道、包埋并完成铸造。铸造后冷却至室温,去除包埋料、喷砂、切割铸道后,依次使用240-800目的碳化硅砂纸将其表面研磨光滑。在0.4MPa压力下,用50微米的A1.03颗粒对试件焊接面喷砂10秒,最后浸泡在丙酮溶液中,超声清洗10分钟,吹干保存。将两个试件10×6mmm2的面相对紧密接触无间隙,固定在特制的夹具上。激光焊接参数设置为：光斑直径、功率和脉冲时间的设置范围为0.3-1.2m,1.0-2.5kW和2.4-18ms。对焊接面进行焊接后,在体式显微镜拍摄焊接面形貌,用Photoshop软件对穿透深度进行测量。[结果]1.光斑直径为0.3mm、0.6mm、0.9mm的实验组的穿透深度值的范围0.719-2.41mm、0.501-1.678mm、0.394-1.071mm。在每个光斑直径的相同能量的组间,随功率上升穿透深度显著上升(p0.05)2.光斑直径为1.2mm的实验组的穿透深度值的范围0.281-0.471mm。在每个光斑直径的相同能量的组间,随功率上升穿透深度无显著变化(p0.05)。3.穿透深度随光斑直径的增大而显著降低(P0.05)；不同功率下的穿透深度有显著差异(P0.05)；随脉冲时间的变化,穿透深度值变化显著(P0.05)。光斑直径对穿透深度影响是最大的(F值=68.894),其次是功率(F值=29.616),再次是脉冲时间(F值=14.398)。光斑直径、功率、脉冲时间两两交互作用不显著(P0.05)。[结论]1. 本实验推导出穿透深度的公式：穿透深度=0.353-1.02×光斑直径+0.527×功率+0.046×脉冲时间。2.光斑直径对于钻铬合金激光焊接后的穿透深度影响显著(p0.05),穿透深度值随光斑直径的增大而降低。因在较小的能量下,能获得理想的穿透深度,临床应用时,应尽量0.3-0.6mm的光斑直径。3.功率的提高能够使钴铬合金激光焊接的穿透深度增大,从修复体制作的多样性、操作的便利性、以及节能、焊接设备的使用寿命,结合实验中所获得数据,建议功率在1.5-2.0kW进行选择。
[Abstract]:[background] cobalt chromium alloy is widely used in the manufacture of various prosthesis in oral cavity because of its excellent mechanical properties, biocompatibility and economy. For the long span metal fixed bridge repair body, in order to improve the final precision of the repair body, it is made by welding it after subsection casting. The casting of removable partial denture is made. After the scaffold is damaged, the repair of the weld is related to the service life of the repair body. But for different repair types, there are different welding requirements. The fixed bridge connector usually has an area of 4-10mm2, and the thickness of the removable partial denture bracket is 1mm. The two kinds of repair bodies need the penetration depth of the welding of 1-2mm and 0.5-1mm. The introduction of welding technology in the field of dental technology is possible to better solve the above problems. Compared with the traditional welding methods (such as arc welding, resistance welding), the welding technology has the advantages of no embedding, convenient operation, and small heat influence area, so it is widely used in the field of oral cavity. In order to solve this problem, the purpose of this experiment is to determine the penetration depth of the laser after laser welding of cobalt chromium alloy under different laser welding parameters to reveal the difference between the factors and penetration depth. It provides reference for the selection of parameters in clinical application. [experimental methods] make 48 6 mm x 6 mm x 10 mm3 organic glass blocks as castings, insert castings, bury and complete the casting. After casting, cooling to room temperature, after the removal of embedded materials, sand blasting and cutting casting, the surface of the 240-800 silicon carbide paper is used to grind and smooth the surface. Under the pressure of 0.4MPa, 50 micron A1.03 particles are used to sandblast the specimen for 10 seconds, and finally soaked in acetone solution, ultrasonic cleaning for 10 minutes, and dry preservation. The surface of two specimens of 10 x 6mmm2 is closely contacted with no gap and fixed on the special fixture. The laser welding parameters are set as spot diameter, power and pulse time. After welding the welding surface with 0.3-1.2m, 1.0-2.5kW and 2.4-18ms., the weld surface morphology was photographed on the body microscope and the penetration depth was measured by Photoshop software. [results the range of penetration depth of the]1. spot diameter of 0.3mm, 0.6mm, 0.9mm of the experimental group was 0.719-2.41mm, 0.501-1.678mm, 0.394-1.071mm. in each spot diameter. Between groups with the same energy, the range of penetration depth of the experimental group with a significant increase in the penetration depth of power (P0.05) 2. is 1.2mm, and the range 0.281-0.471mm. of the penetration depth of the experimental group is 1.2mm. There is no significant change in the penetration depth of each spot diameter (P0.05) with the increase of the penetration depth of the power (P0.05) with the increase of the diameter of the spot. There is a significant difference in penetration depth at different power (P0.05); with the change of pulse time, the penetration depth changes significantly (P0.05). The diameter of the spot has the greatest impact on the penetration depth (F value =68.894), followed by the power (F value =29.616), and again the pulse time (F value =14.398). The 22 interaction of the spot diameter, power and pulse time is not obvious. [conclusion (P0.05). [conclusion]1. this experiment derives the formula of penetration depth: the penetration depth of =0.353-1.02 * the diameter of the spot of +0.527 * * power +0.046 * pulse time.2. spot diameter has a significant influence on the penetration depth after the Cr alloy laser welding (P0.05), and the penetration depth decreases with the increase of the direct diameter of the spot. In the ideal penetration depth, in clinical application, the enhancement of 0.3-0.6mm's spot diameter.3. power can increase the penetration depth of the co Cr alloy laser welding, the diversity of the repair, the convenience of the operation, the energy saving, the service life of the welding equipment, the data obtained in the bonding experiment, and the proposed power in the 1.5-2.0kW Choice.

【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：R783.1

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