Deposition of alumina coatings on monocrystalline diamonds by sol-gel techniques

作者：Felde B^*; Mehner A; Kohlscheen J; Glabe R; Hoffmann F; Mayr P

来源：Diamond and Related Materials, 2001, 10(3-7): 515-518.

DOI：10.1016/S0925-9635(00)00490-8

• adhesion
• coating
• transmission electron microscopy
• hardness

Machining of steel or iron-based alloys with diamond tools leads to rapid tool failure - probably due to chemical wear. The use of monocrystalline diamond tools has, up to now, been obligatory for precision machining. Coating the diamonds with a thin but hard and chemically inert alumina film may overcome the problem. Alumina coatings were deposited by sol-gel techniques. It was shown that a very thin TiN intermediate layer, deposited by reactive sputtering, results in a good adhesion of the alumina coatings to the monocrystalline diamonds. The microstructure of the coatings was characterized by held-emission scanning electron microscopy (FE-SEM) and by transmission electron microscopy (TEM). The deposited coatings showed a nanocrystalline, dense microstructure. The hardness of the coatings was investigated by ultramicrohardness measurements (UMH).

• 出版日期2001-7