Структуроутворення композиційних градієнтних покриттів з підвищеною зносо- та корозійною стійкістю при електроіскровому масопереносі кераміки системи Al-Ti(Zr)-N-B

Викладення процесу створення керамічних покриттів (системи Al-Ti(Zr)-B-N) з підвищеною корозійною стійкістю на металевих сплавах. Формування градієнтної структури покриттів шляхом встановлення закономірностей структуроутворення і фазових перетворень.

Рубрика Производство и технологии
Вид автореферат
Язык украинский
Дата добавления 06.07.2014
Размер файла 58,0 K

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Ключевые слова: покрытия, композиционная керамика, электроискровое легирование, трибологические параметры, коррозионная стойкость, фазовый состав и структура.

Teplenko M.A. Structure-formation of composite gradient coatings with higher wear- and corrosion-resistance under electric-spark masstransfer of Al-Ti(Zr)-N-B ceramics. - Manuscript.

Thesis for a candidate's degree by speciality 05.02.01 - materials science. - The Institute for Problems in Materials Science of National Academy of Sciences of Ukraine, Kiev, 2003.

The goal of this study is to develop ceramic coatings with higher wear- and corrosion resistance on metallic alloys due to formation of gradient structure at electric-spark masstransfer of electrode materials of new generation of AlN-Ti(Zr)B2 and AlN-TiN system without metallic binder. The peculiarities of structure formation and phase transformations under electric-spark masstransfer of the materials pointed out were established at first. They were conditioned by different wetting of alloying components with substrate material. Thanks to this fact, the ceramic Al2O3-based globules with the gradient structure (on the base metal) are formed on the modified interglobule surface based on a substrate metallic alloy. The resistance of ESA-coatings to high-temperature and electrolitical corosion in 3% solution of NaCl was studied. It was shown that corrosion defined by interglobule surface due to formation in its scale composition of Fe2O3-Al2O3-Cr2O3 solid solutions. The systematic reserches of the peculiarities of ESA-coatings tribolodical behaviour under dry friction depending on electrode composition, substrate material, friction regimes and impulses frequency of spark discharge were carried out at first. The results obtained were discussed in the frame of conception of secondary structures formation during tribooxidation. It was established that the ESA-coatings developed under dry friction at higher load-velocity parameters exceeded the nearest analogues such as ESA-coatings based on TiB2, TiN, ZrN, TiC with a metallic binder (Mo, Fe, CrNi): friction coefficient decreased from 0.21-0.38 till 0.15-0.17, wear intensity - by 3-4 times. The possibility to rule over the coating wear intensity by the layer-by-layer ESA because of change of secondary structure composition during tribooxidation was show.

Keywords: coatings, composition ceramics, electric-spark alloying, tribological parameters, corrosion resistance.

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