Abstract
A silicon nitride (Si3N4) based ceramic cutting material and a structural alloy steel (SAE 4340) were surface-treated using a 800 mJ KrF excimer laser with an aim to improve the ceramic-to-metal bond strength. For these two materials, the effects of laser energy density and the number of pulses upon the surface morphologies of the laser-treated surfaces to be joined were examined. Conical surface microstructures were generally observed on the laser-treated surfaces of the Si3N4material, and the number of conical features was found to be significantly influenced by the laser energy density. Moreover, the results of XPS have shown that the surface chemistry of the ceramic was altered after being laser treated. On the other hand, excimer laser treatment had caused the alloy steel surfaces be melted and resulted in some "beach-mark" features. However, the laser energy density has little effect on the overall surface morphology and the roughness of the treated surfaces. Shear tests were performed on adhesive bonded samples of the laser-treated ceramic and alloy steel. Significant improvement in adhesion shear strength was obtained for the laser-treated samples as compared with those tested in the as-received and mechanically abraded conditions. The required laser operation condition for achieving good shear joint strength was discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 327-332 |
| Number of pages | 6 |
| Journal | Materials Letters |
| Volume | 30 |
| Issue number | 5-6 |
| DOIs | |
| Publication status | Published - 1 Jan 1997 |
Keywords
- Adhesive bonding
- Bond strength
- Ceramic-to-metal
- Laser-treated surfaces
- Si N 3 4
- Steel
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering