تأثير عوامل الرش الحراري على مقاومة البلى للفولاذ متوسط الكربون

This research was conducted following the process of coating by thermal spray flame technology through the use of a mixture gas composed of oxygen and acetylene for the purpose of obtaining a surface layer of ceramic coating on the surface of the medium carbon steel type (AISI 1050), provides an increase in the surface properties of the metal which is represented by wear resistance. The research carried out in three successive stages, the first stage included the preparation of the surface of specimens as well as the preparation of powder coating and analysis of chemical components of the specimens and coating powders. While the second stage included the implementation of the connector coating process (nickel-aluminum) and coating the main (alumina) using a flame spray coating process conducted in different ways for each specimen by change in spraying factors, which included the surface roughness of the base specimens, the temperature of the surface of the base specimens before the coating process, the distance between the spray gun nozzle and the surface of the specimens and thickness of the coating. The third stage included the testing of standard tests, which includes adhesion test, check wear and roughness of different coatings in addition to a microscopic examination of the successive layers of coat and surface basis. It has been reached on the best variables that give the high adhesion and the lowest wear rate, where the results showed that the increase of roughness from (0.85 μm) to (10.50 μm) led to the low rate of wear by up to about (51 %) more than half, The best temperature of the heated surface of the foundation before the coating process to obtain the lowest rate of wear and higher adhesion ranging from (200 C º) to (300 C º). While the optimal distance between the spray nozzle and the surface of the specimen ranging from (150 mm) to (200 mm) and thickness optimized for coating ranging from (0.15mm) to (0.5mm) for the best coating with the lowest wear rate. في هذا البحث تم إجراء عملية الطلاء الحراري باتباع تقنية الرش باللهب من خلال استعمال خليط غازي مكون من الأوكسين و الإستيلين لغرض الحصول على طبقة سطحية من الطلاء السيراميكي على سطح الفولاذ المتوسط الكربون نوع (AISI 1050). و التي توفر زيادة في الخواص السطحية للمعدن المستعمل المتمثلة في مقاومة البلى. نفذ البحث بثلاث مراحل متلاحقة، تضمنت المرحلة الأولى تحضير النماذج و تهيئة السطح الأساس لهذه النماذج و كذلك تحضير مساحيق الطلاء و تحليل المكونات الكيماوية للنماذج و مساحيق الطلاء. بينما تضمنت المرح