权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Dynamic environmental evaluation of performed on interface of ceramics and metals joints

陶瓷与金属接头界面动态环境评价

基本信息

批准号：
10650713
负责人：
TAKASHIMA Toshiyuki
金额：
$ 2.11万
依托单位：
Hokkaio Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

From fiscal 1998 until fiscal 1999, a dynamic environmental evaluation was performed on the interface of ceramic-metals joints. The following results were obtained:1. Dynamic environmental evaluationThe test specimens were subjected to three-point bending, four-point bending, and cyclic loading tests conducted in heat, vacuum, and gas atmosphere. The joints of the test specimens were strong enough to withstand the test environments.2. Fixed load/Thermal loading test (Si3N4-kovar joints prepared by the active metallic method)(1) When the joints were thermally loaded under a fixed load of 204 MP.a at 86.4 ks in a temperature range of 323-573K, the fracture strength decreased from 450 Mpa almost linearly as the test temperature increased.(2) In terms of morphology, joints under thermal load caused Si3N4 to adhere to the koval alloy side. The size of the Si3N4 adhering area started to decrease when under load at a test temperature of 423K and the fracture strength also decreased accordingl … More y.(3) The joints fractured at the interface of the Si3N4 and Ti-compound (TiN, Ti5Si3) reaction layer.(4) When the test temperature increased, the fracture strength decreased. This is thought to have occurred because the thermal loading increased the shear stress, which can be attributed to the discrepancy in the thermal expansion rate at the interface of the Si3N4 and Ti-compound (TiN, Ti5Si3) reaction layer.3. Cyclic loading/Thermal loading test (Si3N4-kovar joints prepared by the active metallic method)(1) The joints were thermally loaded to 398K under cyclic loading of 204 Mpa However, the fracture strength did not show any characteristic tendency even when the number of cycles was increased. Thermal loading to 448K under cyclic loading of 204 Mpa did not reduce the fracture strength remarkably, irrespective of the number of cycles. This is thought to result from softening of the brazing layer due to heating, which released residual stress from the joint and the resulting plastic deformation of the joint absorbed the load.These results clarify the environmental conditions [Suggest: required] for practical use of ceramic-metallic joints. However, testing under higher stress and thermal loads is deemed to be necessary. Less

从1998年度到1999年度，对陶瓷-金属接头的界面进行了动态环境评价。获得了以下结果：1.动态环境评估测试样本进行三点弯曲，四点弯曲，并在热，真空和气体气氛中进行循环载荷试验。试样的接头强度足以承受试验环境.固定载荷/热载荷试验（活性金属法制备的Si_3 N_4-可伐合金接头）（1）当在323- 573 K的温度范围内在86.4ks下在204MP.a的固定载荷下对接头进行热载荷时，随着试验温度的升高，断裂强度从450 MPa几乎线性地降低。(2)在形态方面，在热负荷下的接头导致Si 3 N4粘附到科瓦尔合金侧。在423 K的载荷作用下，Si_3N_4粘结区的尺寸开始减小，断裂强度也随之降低。 ...更多信息 y. (3)接头在Si_3N_4和Ti化合物（TiN，Ti_5Si_3）反应层的界面处断裂。(4)随着试验温度的升高，断裂强度降低。人们认为发生这种情况是因为热负载增加了剪应力，这可以归因于Si 3 N4和Ti化合物（TiN、Ti 5Si 3）反应层界面处热膨胀率的差异。3.循环载荷/热载荷试验（活性金属法制备的Si 3 N4-可伐合金接头）（1）在204 MPa的循环载荷下将接头热载荷至398 K，但是，即使循环次数增加，断裂强度也没有显示出任何特征趋势。在204 Mpa的循环载荷下，热载荷至448 K并没有显著降低断裂强度，无论循环次数如何。这被认为是由于钎焊层因加热而软化，从而释放了接头的残余应力，接头的塑性变形吸收了载荷。这些结果阐明了陶瓷-金属接头实际使用的环境条件[建议：需要]。然而，在更高的应力和热负荷下的测试被认为是必要的。少