Active Brazing Technology for Ceramics
Active brazing technology for ceramics uses reactive elements like titanium or zirconium to create a chemical bond with oxide or non-oxide ceramics. This enables direct metal-ceramic joints.
Physical-Chemical Mechanism of Action
Active brazing technology adds reactive elements to the filler metal that chemically react with the ceramic surface. Titanium and zirconium are typical additions because they can form a strong bond with various ceramic materials. This reaction forms a metallic layer on the ceramic surface that bonds the metal to the filler.
Metallurgical Relevance & Welding Risks
Active brazing improves the durability and strength of metal-ceramic joints. It prevents porosity and increases the toughness of the joint. However, an incorrect addition or insufficient reaction can lead to missing bonds or excessive hardness, which can soften the material.
Workshop Practice & Action Instructions
To successfully apply active brazing, follow these steps:
1. Choose the additions: Use titanium or zirconium in the right concentration.
2. Pre-treat the filler: The filler must be clean and free of impurities to ensure an optimal bond.
3. Prepare the ceramic surface: The ceramic surface should be smooth and free of dirt to promote the chemical reaction.
4. Control reaction time and temperature: Enough time and an optimal temperature are critical for a successful bond.