The use of high-strength vacuum-deposited coatings as a means of protection against wear

Palatnik, L. S.; Il'inskii, A. I.; Gol'dshtein, L. Ya.; Guiva, V. A.

doi:10.1007/bf00722623

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“…The processes of epitaxial crystal growth of one substance on the surface of others are well known (Laudise 1970, Matusevich 1968, Mullin 1972, Shubnikov and Parvov 1969, Vainstein 1980. They can take place both from a gaseous phase (i.e., sublimation) and from a liquid phase (crystallization) (Palatnik and Papirov 1971). The gaseous phase often is especially used for purification of some volatile substances and in microelectronics.…”

Section: Introductionmentioning

confidence: 99%

Process of epitaxial crystal growth for CaSO₄ · 0.5H₂O on a surface of dissolving fluorapatite crystals studied by scanning electron microscopy

Dorozhkin

1996

Scanning

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Summary:A process for the epitaxial crystal growth for CaSO 4 • 0.5H 2 O on a surface of dissolving natural fluorapatite (FAP) crystals under conditions of wet-process phosphoric acid production has been studied by scanning electron microscopy (SEM). With the SEM working in a secondary electron mode, we were able to establish the main stages of the coating formation, including direct measurements of its thickness and growing rate values for individual needle-like CaSO 4 • 0.5H 2 O crystals. Confirmation of an aggregate mechanism for CaSO 4 • 0.5H 2 O epitaxial crystals growth, established earlier under conditions of chemical crystallization, was achieved for the first time. The mechanism includes the following steps: (1) ultramicrocrystals of CaSO 4 • 0.5H 2 O were formed, (2) they coalesced into needlelike crystals by means of mutual aggregation, (3) the needle-like crystals united into star-like and besom-like aggregates, and (4) the latter formed macro-aggregates. We have found that these steps occur simultaneously, resulting in multilayer coating formation. During the investigation, the phenomenon of FAP crystals aggregation by means of mutual intergrowing of epitaxial CaSO 4 • 0.5H 2 O coatings and the peculiarities of the etching process for the FAP crystal surface under conditions of CaSO 4 • 0.5H 2 O coatings formation were also studied.

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Section: Introductionmentioning

confidence: 99%

Process of epitaxial crystal growth for CaSO₄ · 0.5H₂O on a surface of dissolving fluorapatite crystals studied by scanning electron microscopy

Dorozhkin

1996

Scanning

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The use of high-strength vacuum-deposited coatings as a means of protection against wear

Cited by 1 publication

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Process of epitaxial crystal growth for CaSO₄ · 0.5H₂O on a surface of dissolving fluorapatite crystals studied by scanning electron microscopy

Process of epitaxial crystal growth for CaSO₄ · 0.5H₂O on a surface of dissolving fluorapatite crystals studied by scanning electron microscopy

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The use of high-strength vacuum-deposited coatings as a means of protection against wear

Cited by 1 publication

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Process of epitaxial crystal growth for CaSO4 · 0.5H2O on a surface of dissolving fluorapatite crystals studied by scanning electron microscopy

Process of epitaxial crystal growth for CaSO4 · 0.5H2O on a surface of dissolving fluorapatite crystals studied by scanning electron microscopy

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Process of epitaxial crystal growth for CaSO₄ · 0.5H₂O on a surface of dissolving fluorapatite crystals studied by scanning electron microscopy

Process of epitaxial crystal growth for CaSO₄ · 0.5H₂O on a surface of dissolving fluorapatite crystals studied by scanning electron microscopy