Adhesion mechanism between titanium and gold?

In summary, the conversation discusses the role of titanium as an adhesion promoter between silicon dioxide and gold films at room temperature. The adhesion mechanism is believed to be metallic bonding, with some degree of alloying occurring at all temperatures. References for relevant studies on diffusion in thin film titanium-gold couples are suggested for further reading.
  • #1
sabine_
4
0
Hi all,

I sputtered titanium (10 nm) - gold (~ 100 nm) films at room temperature on
oxidized silicon substrates. The titanium acts as an adhesion promoter between the SiO2
and the gold film.
My Question:
What is the adhesion mechanism between the titanium and gold film at room temperature (273-300 K)?

Thanks.

Sabbi
 
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  • #2
Metallic bonding.
 
  • #3
I thought of interdiffusion and building up of an intermetallic transition Zone (TiAu2, TiAu,...).
But this happens properly only at higher temperatures ?
Could you give me a reference for metallic bonding as the adhesion mechanism in the Ti-Au-System ?

Thanks a lot.
Best regards
 
  • #4
Some degree of alloying occurs at all temperatures. Try Google Scholar for relevant studies, e.g., Tisone and Drobak, "Diffusion in Thin Film Ti–Au, Ti–Pd, and Ti–Pt Couples" and Martinez et al., "Titanium diffusion in gold thin films".
 
  • #5
Thank you very much!sabi
 

1. How does the adhesion mechanism between titanium and gold work?

The adhesion mechanism between titanium and gold is based on the strong chemical bond formed between the two metals. Titanium and gold both have high surface energies, which allows for the formation of stable chemical bonds at the interface between them.

2. What factors influence the adhesion between titanium and gold?

The adhesion between titanium and gold is influenced by several factors, including surface roughness, surface cleanliness, and interfacial chemistry. Surface roughness can increase the contact area between the two metals, promoting better adhesion. A clean surface is also essential for strong adhesion, as any contaminants can weaken the bond. Additionally, the chemical properties of the two metals and their compatibility play a role in the adhesion mechanism.

3. Can the adhesion between titanium and gold be improved?

Yes, the adhesion between titanium and gold can be improved by using surface treatments or coatings. For example, the use of plasma treatments or chemical etching can increase surface roughness and improve bonding between the metals. Additionally, the use of intermediate layers or adhesion promoters can enhance the adhesion between titanium and gold.

4. What applications require strong adhesion between titanium and gold?

The strong adhesion between titanium and gold is commonly used in the medical field, particularly in dental implants. This combination of metals is also used in aerospace and electronics industries, as well as in jewelry making.

5. Are there any challenges or limitations to the adhesion between titanium and gold?

One limitation of the adhesion between titanium and gold is that it can be affected by environmental factors, such as humidity and temperature. Additionally, the adhesion may weaken over time due to the formation of oxides on the metal surfaces. To address these challenges, proper surface preparation and selection of appropriate adhesion promoters can help improve the adhesion between titanium and gold.

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