Abstract:
Запропонована нова технологія захисту деталей з високоміцних чавунів, яка полягає в електроіскровому легуванні їх поверхні алюмінієм з подальшим нанесенням шару електродом з композиційного матеріалу 90%ВК6+10%1М. На сформоване покриття наносять металополімерний матеріал, армований порошком WC, ZrN або їх сумішшю, доданих в двокомпонентну епоксидну систему, наповнену феросиліконом марки Loctite 3478 при концентрації армуючої речовини, відповідно ~ 80% WC; 80% ZrN і 40%WC+40%ZrN. Частину шару МПМ видаляють шліфуванням до виступів шорсткості нанесеного покриття.
Description:
There has been proposed a new technology for protecting the parts made of high-strength cast iron. The technology consists in electrospark alloying (ESA) of the part surfaces with aluminum followed by applying a special layer thereeon with the use of an electrode made of 90%VK6+10%1M composite material. Onto the formed coating, there is applied a metal-polymer material (MPM), reinforced with WC and ZrN powders or their mixture, which has been added to a two-component epoxy system filled with Loctite 3478 ferrosilicon at the concentration of the reinforcing substances of ~ 80% WC; 80% ZrN and 40%WC+40%ZrN, respectively. After that, a portion of the MPM layer is removed by grinding it up to the applied coating roughness protrusions. Comparative examinations have established that for the high-strength cast iron of VCh50 grade, in terms of hydro abrasive wear resistance thereof, the best results had been achieved by the specimens with the coating formed in the sequence of ESA Al → ESA (90% VK6 + 10% 1M) → MPM (80% ZrN), the wear of which was 97.1% less as compared to the specimens without coatings, 44.1% less as compared to the prototype (the specimens of 12Х18Н10Т steel) and, accordingly, 5.9 and 14.7% less as compared to the specimens with the coating formed in the sequence of ESA Al → ESA (90%VK6+10%1M) → MPM (40 %WC+40%ZrN) and in the sequence of ESA Al → ESA (90%ВК6+10%1М) → MPM (80% WC).
