Solution for Blackening Welding of Titanium Alloy and Zirconia Ceramic

一、 The scientific revelation of blackening phenomenon
1. The change in stoichiometric ratio of active metals in titanium alloys, such as titanium and zirconium, will react with oxygen ions in zirconia ceramics at the welding temperature. This reaction causes the zirconia ceramic to undergo oxygen loss and denaturation, resulting in color defects that cause the color to turn black and gray.
During the welding process, if zirconia ceramics come into contact with reducing media such as carbon, or if active metal elements in the solder wet zirconia ceramics to form titanium oxides, it will cause zirconia to lose some oxygen atoms, form lattice defects, and eventually turn black in color.
二、 The impact of blackening on performance
The blackening of zirconia ceramics not only affects their aesthetics, but more importantly, it may lead to a decrease in material properties. For example, after blackening, zirconia ceramics may lose their original insulation properties and their impact toughness will significantly decrease. This is mainly due to the significant difference in thermal expansion coefficients between titanium alloys and zirconia ceramics. If the stress generated during the welding process is not properly relieved, it can lead to joint embrittlement.
三、 Solutions and Technological Innovation
1. Choose a suitable solder material that is compatible with titanium alloys and zirconia ceramics, which can reduce chemical reactions during the welding process and avoid blackening.
2. Optimizing the distribution ratio of ceramic components can enhance the stability of zirconia ceramics, reduce oxygen loss during welding, and avoid blackening.
3. Controlling the welding atmosphere is crucial during the welding process. By adjusting factors such as welding temperature and atmosphere composition, the occurrence of blackening can be suppressed.
4. Applying a buffer layer at the welding joint between titanium alloy and zirconia ceramic can effectively alleviate the stress caused by the difference in thermal expansion coefficient and improve the impact toughness of the joint.
四、 Industry Applications and Future Prospects
The welding technology between titanium alloy and zirconia ceramics has broad application prospects in medical, aerospace, electronics and other fields. With the continuous advancement and innovation of technology, we have reason to believe that future welding technologies will be able to more effectively prevent blackening and improve the overall performance of welded joints.
Although the phenomenon of blackening in the welding of titanium alloy and zirconia ceramics is complex, we are fully capable of overcoming this problem through scientific methods and innovative technologies.

Baoji Dingding Titanium Products Co., Ltd. specializes in producing high-quality and high-performance titanium alloy products that meet aerospace and medical standards