RESUMOCarbonado é a denominação de um diamante policristalino opaco e de cor escura, naturalmente encontrado no Brasil e na República Central Africana. Artificialmente é possível produzir-se um diamante sintético policristalino do tipo carbonado. Devido a sua microestrutura constituída de muitos grãos, este diamante é mais duro e mais tenaz que os comuns. Assim, pode ser usado com vantagens em brocas para perfuração de petróleo e outras ferramentas resistentes à abrasão. O objetivo deste trabalho foi, pela primeira vez, produzir o carbonado no Brasil e apresentar suas características microestruturais. Este carbonado foi sintetizado a altas pressões e temperaturas utilizando grafite brasileiro no setor de Materiais Superduros da UENF. As características avaliadas o colocam como um material compatível para utilização em ferramentas de corte e perfuração.Palavras chaves: Diamante policristalino sintético, carbonado, microestrutura, resistência à abrasão, materiais superduros. Microstructural characteristics of brazilian graphite produced carbonado diamond ABSTRACTCarbonado is the name given to a polycrystalline, opaque and dark color diamond, which is naturally found in Brazil and in the Central Republic of Africa. Artificially, it is possible to produce a carbonado type synthetic polycrystalline diamond. Owing to its microstructure, which is constituted by many grains, this diamond is harder and tougher than the common ones. Therefore, it can be used with advantage in petroleum perforation drill and other wear resistant tools. The objective of this work was, for the first time, to produce a synthetic carbonado in Brazil and to present its microstructural characteristics. This carbonado was synthesized at high pressure and high temperature, using Brazilian graphite, at the sector of Superhard Materials of the State University of the Northern Rio de Janeiro, UENF. The evaluated characteristics indicated that this carbonado is a proper material for cutting and drilling tools.

Diamond embedded cutting saws (DCSs) are basic tools commonly used in every ornamental stone processing operation from the extraction of the quarry block to the finishing of tiles. Diamond particles are the hard and abrasive essential component that has to be well adhered to the saw matrix, whether metallic, ceramic or polymeric. This work presents a computer simulation analysis and experimental design for an optimized manufacturing process of DCSs. This discrete simulation assesses the basic parameters involved in a possible industrial production in order to maximize the dynamics of the system and operational rules needed for best final products.

No abstract

This paper analyzed the contributions of a 5-day kaizen event in the Container management industry to effectively utilize resources and eliminate waste from container rentals. The practices adopted were described during the kaizen event in a multinational oil and gas company. The results found allowed the discussion of impacts in three guiding dimensions of the business, cost, quality and delivery. The main improvements evidenced were related to cost reduction and efficient use of resources. The dissemination of the culture of continuous improvement is enhanced during the event. Finally, the research reinforces that the use of kaizen as an element of competitive force brings positive results for the organization.