Kuroda K
1st Department of Orthodontics, Faculty of Dentistry, Tokyo Medical and Dental University.
Kokubyo Gakkai Zasshi. 1994 Dec;61(4):542-63. doi: 10.5357/koubyou.61.542.
In order to attain joining the super-elastic Ti-Ni alloy wire to the Co-Cr alloy wire and be able to maintain the super-elasticity of the Ti-Ni alloy wire, a new soldering method was devised. The silver solder was first molten on the 0.016 x 0.022 inch Co-Cr alloy wire (Co-Cr) and then flowed onto the 0.016 x 0.022 inch super-elastic Ti-Ni alloy wire (Ti-Ni) to form soldering. The specimens of soldered Ti-Ni to Co-Cr butt joint, TN-CC, were examined for its super-elasticity, torsional strength, tensile strength and the metallographic structure of the soldered joint. The findings were as follows: 1. TN-CC still maintained its super-elasticity. 2. The torsional strength of TN-CC was equal to that of Ti-Ni. The tensile strength of TN-CC was 73% of that of Ti-Ni. 3. The tensile strength of TN-CC immersed in 1%NaCl solution at 37 degrees C for 30 days was considered to be still strong enough for clinical use. 4. During the tensile strength test, the breakage of TN-CC occurred at the area of merger of the solder and Ti-Ni. As the reason for this breakage, it suggested that Ti-Ni was stretched and narrowed at the soldered area and that the Sn-rich phase in the solder was induced along Ti-Ni. 5. This new soldering method was shown to be useful in clinical cases, and the fabrication of new orthodontic appliance using two distinct types of wire, one to independently move teeth and the other to be the anchorage, has already been developed.
为了将超弹性钛镍合金丝与钴铬合金丝连接起来，并能够保持钛镍合金丝的超弹性，设计了一种新的焊接方法。首先将银焊料熔化在0.016×0.022英寸的钴铬合金丝（Co-Cr）上，然后使其流到0.016×0.022英寸的超弹性钛镍合金丝（Ti-Ni）上形成焊接。对焊接的钛镍与钴铬对接接头（TN-CC）的试样进行了超弹性、扭转强度、拉伸强度以及焊接接头金相组织的检测。结果如下：1. TN-CC仍保持其超弹性。2. TN-CC的扭转强度与钛镍合金丝的扭转强度相当。TN-CC的拉伸强度为钛镍合金丝拉伸强度的73%。3. 将TN-CC浸泡在37℃的1%氯化钠溶液中30天后，其拉伸强度仍被认为足以满足临床使用。4. 在拉伸强度测试过程中，TN-CC在焊料与钛镍合金丝的融合区域发生断裂。作为这种断裂的原因，推测是钛镍合金丝在焊接区域被拉伸变窄，并且焊料中的富锡相沿着钛镍合金丝析出。5. 这种新的焊接方法在临床病例中显示是有用的，并且已经开发出了使用两种不同类型的丝制作新的正畸矫治器，一种用于独立移动牙齿，另一种用作支抗。
