As a key component of evapotranspirant aspirants, titanium plays an irreplaceable role in improving the adsorption performance of aspirants, optimizing the reaction process, improving material properties and adapting to diversified preparation processes with its excellent physical and chemical properties, and is of great significance for maintaining the stability and reliability of high-vacuum environments.
Enhance gas adsorption capacity
The metal film formed by evapotranspiration has a porous microstructure with a high specific surface area, which significantly increases the contact area with gas molecules and improves the adsorption efficiency. As an important component of thin films, titanium can further optimize the pore structure and surface morphology, strengthen the chemical adsorption and capture ability of reactive gases (such as H₂, O₂, N₂, CO, etc.), and maintain the vacuum level of the system more effectively.
Regulate the thermodynamics of barium-titanium absorbing agents
In the barium-titanium aspirant system containing Fe₂O₃, the reduction reaction of barium is an exothermic process, forming a self-sustaining reaction mechanism and reducing the dependence on external heat sources. Titanium is involved in the formation of intermetallic compounds in this system, regulating the reaction path and heat release characteristics, making the evapotranspiration process more stable and controllable, while reducing the overall energy consumption and improving process stability.
Improve material sintering and structural stability
Titanium has good sintering activity, which can promote the diffusion and combination between particles in the preparation of aspirants, forming dense sintered bodies with high mechanical strength. This not only enhances the ability of the aspirator to resist vibration and shock, but also improves its structural integrity and service life under long-term working conditions.
Form highly stable compounds to inhibit harmful evaporation
Titanium and aluminum can form TiAl intermetallic compounds with high evaporation temperatures, which have extremely low vapor pressure at evapotranspiration temperatures, which can effectively inhibit the premature evaporation of aluminum films, reduce the risk of contamination to the inside of the device, especially on optical or sensitive surfaces, and ensure the performance and reliability of the device.
Promote the decomposition of the absorbent alloy and reduce the process temperature
Titanium's strong reducing properties and high affinity for oxygen help the absorbent alloy to break down and release active substances at lower temperatures, reducing the operating temperature required to support the substrate. The lower substrate temperature facilitates good slag-to-substrate bonding, preventing particle sputtering contamination while improving process safety.
Adapt to a variety of substrates and molding processes
Titanium-containing absorbers can adopt appropriate molding processes according to different substrates (such as nickel, stainless steel, molybdenum, titanium, etc.) and device structures:
Dry powder pressing method: suitable for powder pressure suction agent and KPB type cyclic barium absorber, the active powder is directly pressed on the substrate, the process is simple and the combination is firm.
Plaster method: suitable for belt and tubular substrates with pits or complex structures. It is divided into wet paste (with organic binder as the carrier) and dry paste (made of alloy powder mixed with titanium-based binder), the latter titanium-based binder usually contains 65% titanium powder and 35% organic carrier, has good formability and adhesion strength, and can meet the needs of diverse device integration.
Titanium in evapotranspirators optimizes the film structure, participates in and regulates exothermic reactions, reinforces the sinterability of materials, and forms high-temperature stable phases It promotes multiple mechanisms such as alloy decomposition and adaptation to multiple molding processes, comprehensively improves the adsorption performance, process adaptability and long-term reliability of air absorbents, and is an important functional material to promote the development of high-vacuum devices and technologies.
