Composite structural material with diffusion barrier layer, espe

Details Composite structural material with diffusion barrier layer, espe Composite structural material with diffusion barrier layer, espe

1987-01-12

1989-05-16

Nguyen, Nam X.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

20419215, 2041923, 428660, B32B 1501, C23C 1434

Patent

active

048309338

ABSTRACT:
A composite structural material particularly intended for frictional and slide elements, consisting of a substrate such as a steel layer with a copper- or tin-containing intermediate layer, a tin- or copper-containing functional layer and, between these last two layers, a diffusion barrier layer protecting against diffusion of tin from the functional layer into the intermediate layer or back to the diffusion barrier layer. The diffusion barrier layer consists of a metallic material having a hexagonal crystal lattice, which material is applied by cathodic sputtering, forming a material structure that is densely packed in vacuo with a space filling by metal ions of above 70%. For the cathodic sputtering, conditions of plasma pressure and substrate temperature can be chosen so that recrystallization occurs simultaneously with the formation of the diffusion barrier layer; this makes it possible to achieve the densest hexagonal packing, with a space filling of up to 74%. Pure titanium is the preferred material for the diffusion barrier layer.

REFERENCES:
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patent: 4448854 (1984-05-01), Schuller et al.
patent: 4591536 (1986-05-01), Hodes et al.
patent: 4619865 (1986-10-01), Keen et al.
K. Kobayshi et al., "High Density . . . Disks", Fujitsu Sci. Tech. J., 19, 1, pp. 99-126, 3/83.

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