Tensile strength comparison of presoldered and postsoldered joints.
Tensile strength comparison of presoldered and postsoldered joints.
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预焊和后焊接头的拉伸强度比较。
DOI：
10.1016/0022-3913(86)90065-x
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Asgar,K
中科院分区：
文献类型：
--
作者：
Monday,JJ;Asgar,K
二十个半哑铃形杆铸造在无银的金钯合金中，该合金包含最少42%的新鲜合金和剩余的一次熔化的合金。每对半哑铃组装和预焊或焊后使用真空烘箱和火炬焊接技术。在相同的技术组中，焊接前和焊接后的接头之间的极限拉伸强度值没有显著差异，但是相同焊料的火炬焊接接头明显更强（p<0.01）。研究认为，缓慢加热和冷却对接头的极限拉伸强度（UTS）有不利影响，这可能是由于所使用的后焊料的显微组织变化和高氧化物含量所致。在每一组中，通过预焊连接的样本显示出比通过后焊连接的样本显著更高的强度（p<0.02）。重熔母合金影响焊前和焊后接头之间的强度差异。据推测，在重熔，母合金的性质发生了变化，因为一些原始元素挥发和新形成的氧化物溶解到它。因为它含有铜，后焊比预焊料更受这种污染的影响。母合金的UTS，以及预焊料和后焊料，也被确定。正如预期的那样，母合金具有最高的强度和焊后，最低的。
Twenty half-dumbbell shaped rods were cast in a silverless gold-palladium alloy that contained a minimum of 42% fresh alloy and the rest once-melted alloy. Each pair of half-dumbbells was assembled and either presoldered or postsoldered using a vacuum-oven and a torch-soldering technique. There was no significant difference in the ultimate tensile strength values between the presoldered and postsoldered joints within the same technique group, but the torch-soldered joints for the same solder were significantly stronger (p< .01). It was believed that slow heating and cooling has deleterious effects on the ultimate tensile strength joints (UTS) possibly because of the microstructural changes and the highly oxidizable content of the postsolder used.Another 15 samples cast using once, twice, and three-times remelted parent alloy were presoldered and postsoldered with the torch only. In each of these groups, specimens joined by presolder showed significantly higher strength than those joined by postsolder (p< .02). Remelting the parent alloy affected the strength differences between the presoldered and postsoldered joints. It was assumed that on remelting, the nature of the parent alloy is changed because some original elements are volatilized and newly formed oxides dissolved into it. Because it contains copper, the postsolder is more affected by this contamination than presolder.The UTS of the parent alloy, as well as that of the presolder and postsolder, were also determined. As expected, the parent alloy possessed the highest strength and the postsolder, the lowest.
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影响因子：
--
作者：
G. Mumford
通讯作者：
G. Mumford
DOI：
--
发表时间：
1979
期刊：
The Journal of prosthetic dentistry (Print)
影响因子：
--
作者：
E. J. Rasmussen;R. J. Goodkind;W. Gerberich
通讯作者：
W. Gerberich
凝固时间对牙科金铸造合金显微组织和物理性能的影响
DOI：
--
发表时间：
1966
期刊：
Journal of dentistry research
影响因子：
--
作者：
A. Ady
通讯作者：
A. Ady
各种陶瓷-金属组合的焊接接头的强度特性。
DOI：
--
发表时间：
1980
期刊：
The Journal of prosthetic dentistry (Print)
影响因子：
--
作者：
R. Staffanou;R. Radke;M. Jendresen
通讯作者：
M. Jendresen