Desgaste de aços AISI H13 recobertos com filmes finos ternários Ti1-xAIxN com diferentes estruturas cristalinas

• Ano de defesa: 2008
• Autor(a) principal: Janaina Kizzi de Morais Silva
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: filmes Ti1-xA1xN; desgaste; Perfilometria; Engenharia metalúrgica
• Link de acesso: http://hdl.handle.net/1843/BUDB-8DRN8X

Wear phenomena is the most common cause of the industrial materials failures. The wear control is primary provided through of the wear rates evaluation. The experimental studies use the weight loss for time to evaluate the wear rate. This procedure is based in materialdensity. An estimate of wear volume is made through of the material density. Whit respect to compound material, this procedure is not accuracy, because this material have density gradient. Because of the direct evaluation of the material volume, the three-dimensionalprofilometry with wear and machining is a new approach. The profilometry provides the direct evaluation of the wear volume of coupled materials. The performance of the hot tools for work has been optimized through films deposited by PVD, such as Ti1-xAlxN that is applied against the wear of the tool. The content of aluminum of the film affects its crystalline structure and hardness. This factor influences the wear resistance. This study created a methodology through profilometry to estimate the wear volume volume and evaluate the sliding wear rate of the coatings Ti1-xAlxN processed by PVD on AISI H13 without treatment and AISI H13 quenched and tempered and evaluate the influence of the aluminium content (crystalline structure) present in films, in the slidingwear. For this, sliding wear tests against Si3N4 and WC-Co balls were carried out using a ball-on-disc tribometer. The wear rate (volume/sliding distance) was estimated by threedimensionalprofilometry. This methodology and the relation between structure andproperties were important facts of this work. This work indicated that Ti1-xAlxN films with both structures improved the wear performance of the H13 steel. The treatments of the quenched and tempered showedsuperior wear resistance of the H13 steel. The compound material with highest hardness (resulted of crystalline structure) and highest H/E, showed best wear performance.