Microstructure and texture investigation of chemically deposited copper coatings. (March 2015)

• Record Type: Journal Article
• Authors: Georgieva, M.; Avdeev, G.; Stoychev, D.; Petrova, M.
• Is Part Of: Transactions of the Institute of Metal Finishing. Volume 93:Number 2(2015:Mar.)
• Page Start: 97
• Page End: 103
• Publication Date: 2015-03
• Subjects: Metals -- Finishing -- Periodicals; Metals -- Surfaces -- Periodicals; Metallurgy -- Periodicals; 671.705
• DOI: 10.1179/0020296714Z.000000000201
• Languages: English
• ISSNs: 0020-2967

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>This work reports electron microscopy and X-ray investigations of the structure and texture of thin copper coatings that were chemically deposited (<sub>chem</sub>Cu) from trilonic electolytes. The relationships between the structure and texture of <sub>chem</sub>Cu, and the structure and texture of electrochemically deposited copper coatings have been established. It has been determined that chemically deposited copper coatings have very fine crystal structure, with areas of coherent scattering that are orders of magnitude smaller than their counterparts in matt copper coatings (<sub>matt</sub>Cu) that are electrochemically deposited from simple (non-complex) sulphuric-acid electrolyte. Additionally, in <sub>chem</sub>Cu, the axis of preferred orientation is in the <111> direction, while in <sub>matt</sub>Cu it is in the <110> direction. Alternatively, bright copper coatings (<sub>bright</sub>Cu) (electrodeposited from similar sulphuric acid electrolyte but with brightener additives), which are also characterised with extremely fine crystal structure have mixed <311> plus <110> texture, at a <311> dominant axis of preferable orientation. The values of microhardness of the copper coatings are arranged in the following sequence: HV<sub>mattCu</sub><HV<sub>chemCu</sub><HV<sub>brightCu</sub>, opposite to the crystal size (<italic>D</italic>) and the internal stress (rms) in these three types of coatings – <italic>D</italic><sub>mattCu</sub>> <italic>D</italic><sub>chemCu</sub>><italic>D</italic><sub>brightCu</sub> and rms<sub>mattCu</sub>>rms<sub>chemCu</sub>≧rms<sub>brightCu</sub>. The data obtained for <italic>D</italic> and rms are in good agreement with the Hall–Petch rule on HV-grain size relationship.</p> </abstract>