The brazes produced at 1030oC showed mixed results. In the 15 minute braze the different metal foils melted together and bonded to the stainless steel but there was no interaction with YSZ, as seen in Fig. 6. At 1030oC for 30 minutes; the filler metal melted completely and it was more homogeneous; it reacted locally with the YSZ and bonded to it.
Fig. 7 shows porosity being more prominent in this braze than in the 1010oC/60’ braze. Fig. 11 corresponds to the 1030oC/30’ braze and it depicts the different regions of the braze joint. The transition zone next to the stainless steel remained unchanged in terms of width and composition, (i.e. 68.0-70.0 wt. % Ti, 13.0 wt. % Cr, 7.0-12.0 wt. % Fe, and 12-7.0 wt. % Ni).The wide band of the braze metal became larger, 95-105 Im, as the narrow band of the braze metal shrunk to 30-35 Im. A large light gray second phase is observed right at the center of the braze joint of Fig. 11; the EDS spot analysis (# 1 in Figure 11) showed that this phase has the same chemistry as found in the transition region next to the stainless steel. Eutectic like structures are seen at both sides of this large second phase; the dark gray matrix was determined to be α -Ti and the light phase consists of 88.0-90.0 wt. % Ti, 7.0-8.0 wt. % Cr, 2.0-3.0 wt. %Fe, and 1.0-2.0 wt. % Ni.
The narrow band of the braze metal (the white phase at the boundary line between these two bands in the braze metal) besides shrinking, became smaller and the nodules attached to the YSZ grew longer. It appears as if there was some type of competitive growth between these two light phases. The EDS spot analysis of the white phase (# 2 in Fig. 11) shows a composition consisting of 92.0 wt % Ti and 8.0 wt. % Ni; the light gray nodules attached to the YSZ,contained some Zr, the spot analysis at location # 3 (Fig. 11) resulted in 87.5 wt. % Ti, 9.8 wt. %Ni, and 2.7 wt. % Zr. The compositions of the different microstructure components of the narrow band for the 1030°C/30’ braze were consistent what it was found with its counterpart of 1010°C/60’.
No reaction layer at the braze metal/ YSZ interface was found either, but both α?Ti matrix and the light gray nodules are bonded to the ceramic substrate, and bonding can only be possible if Ti oxidizes and then forms a localized solid solution with ZrO2. Evidence of the confined reduction of the ZrO2 is offered by the porosity found along this interface and the presence of some Zr in the light gray nodules attached to YSZ. Note that the chemistry of this light gray phase which is not adjacent to the interface contains just Ti at 92.0 wt. % and Ni at 8.0 wt. %,but then the nodules attached to the YSZ, had levels of about 2.7 wt. % Zr and slightly lower levels of Ti at 88.0 wt. % and Ni remaining constant.
d。分析了至少1030ºC漏气关节
在1030oC brazes产生的结果混杂。在15分钟的各种不同的金属箔融化漏气和粘结在一起的不锈钢却没有交互YSZ,图6。在银迟1030oC 30分钟,填充金属锋雀李熔化完全是更均匀;它的反应与YSZ本地和保税。
图7显示更多的突出的孔隙比1010oC漏气的漏气。/ 60图11相当于1030oC / 30 '漏气,它描绘了不同地区的漏气。这个过渡区旁边的不锈钢保持不变的宽度和组成,(即68.0 - 70.0背景。”小钛、铬、。13.0 7.0 - 12.0硅油、。12 - 7.0级菲妮)。”小宽带的金属越来越大,漏气95 - 105 Im,作为窄频带漏气的金属缩小到30 - 35化生。一个大的浅灰色的第二阶段是正确的中心的共同的图11漏气点分析,2001(1)显示在图11a,这一阶段都有相同的化学中发现的过渡区旁边的不锈钢。在晶像结构是双方的第二阶段,这个大深灰色矩阵是决定α-Ti和光明阶段包括88.0 -有效率,重。”小。”~ 8.0 7.0级2.0 - 3.0重铬、铁和1.0。”- 2.0扭转。妮。
狭窄的乐队的金属(白色阶段漏气的界线这两者之间的乐队在漏气金属)变得更小,除了萎缩,附呈YSZ变长了。看来好像岁激有一些类型的竞争发展阶段,这两者之间的光。现场分析》的白色相(# 2在图11)显示一个成分组成的股份并8.0 92.0。”小结节,含有镍附有YSZ,包含了锆、现场分析地点# 3(图11)导致了87.5%,重。”,重约九百八十。和2.7硅油。%市场。不同组织的组成成分的窄带为1030°C / 30的到底是什么东西都一致漏气和对应的1010°C / 60 '。
没有反应在金属/ YSZ漏气被发现,但界面α-Ti矩阵和都浅灰色结节的陶瓷基片、粘结托槽粘结只能成为可能,如钛氧化,然后形成一种局部固溶与二氧化锆产品。证据的限制减少二氧化锆产品是由孔隙中找到的,而这个接口和在场的一些道路的浅灰色结节YSZ相连。需要注意的是,这种浅灰色的阶段并不相邻接口仅仅包含在92.0钛、镍重。”在8.0级的背景下,但是随后的结节”,附有YSZ约270背景水平稍低水平,%锆钛88.0背景,以不变的镍
湾分析钎缝处理960 º ç
由于缺乏粘接样品中钎焊在960oC ，略高于共晶温度为943oC ，标志着一个缓慢的镍和钛interdifussion没有导致镍钛的合金成分会通过固相线和渗透液固相领域。这是明显在15日和30分钟的铝箔分离后，钎焊。然而部分熔融观察系统中暴露60分钟，但数额产生的液体是不够的，湿的不锈钢或氧化锆。该部分的钛-镍相图图所示。第8有助于说明可能组成料后的三个钎焊时间960oC 。
角分析钎焊接加工于10时10 º ç
在15日和30分钟的钎缝处理1010oC未能完全债券。键是有限的钎料和不锈钢，以及几乎没有互动， YSZ.Even虽然不显着混合的镍和钛箔在15分钟（图3 ） ，有可衡量的粘接只有不锈钢钢铁。 30分钟的钎联合经验丰富的大型调音台的铝箔，因而更具流动性形成;这提高了粘接的金属钎焊不锈钢，但除一对夫妇的小水滴被发现附在氧化锆，但没有焊的钎焊金属的陶瓷基板。该系统钎焊60分钟保税完全（图5 ） ;它由团李不同的结构区域。金属的钎约135-145段林;有某种类型的过渡层之间的不锈钢基底和早或衫钎焊金属这是〜 25-35林。该钎焊金属包括两个明显的不同结构;有深灰色带85-95全林载有均匀分散的罚款轻阶段，第陆腔二个波段约50任广泛，包括深灰色矩阵和粗粒层样轻的阶段。还有一个罚款第二阶段，枝或手指形状，在钎焊金属/氧化锆界面。阿硬度调查整个钎联合进行的图已经叠加在上方的显微涉及的硬度与不同的微观结构特征的联合，如在图。 9 。过渡区的硬度测量600 VHN ，而不锈钢注册200 VHN.The硬度相应的矩阵钎测量金属在400 VHN ，以及粗第二阶段是大约500 VHN 。有人指出，硬度大大增加在钎焊金属/氧化锆界面，在价值观〜 1400 VHN的记录。