Micro Chemical Tests
Mostrando 1-12 de 19 artigos, teses e dissertações.
-
1. Evaluation of Lubricating Properties of Diesel Based Fuels Micro Emulsified With Glycerin
The mineral diesel oil sold in Brazil, due to environmental reasons; presents sulfur concentration of 10 ppm, which causes a deficiency of lubricity, since sulfur is one of the chemical species that gives a good lubricating characteristic. Poor lubricity affects performance and causes failure of engine parts. This study aimed to evaluate the use of glycerin
Mat. Res.. Publicado em: 18/12/2017
-
2. Micro-Scale Abrasive Wear Testing of CrN Duplex PVD Coating on Pre-Nitrided Tool Steel
Specific wear rates were calculated from a series of micro-scale abrasive tests by means of the calotte-grinding method. The tested material was a CrN coating deposited by arc evaporation on ion-nitrided AISI H13 steel. Characterizations included: phase analysis, chemical composition, metallography, microhardness, micro-scratch resistance and nano-indentatio
Mat. Res.. Publicado em: 22/06/2017
-
3. Investigation of Adhesion and Tribological Behavior of Borided AISI 310 Stainless Steel
In the present study, the effects of the boriding process on adhesion and tribological properties of AISI 310 steel were investigated. Boriding was performed in a solid medium consisting of Ekabor-II powders at 1123 and 1323K for 2 and 6 h. The boride layer was characterized by optical microscopy, the X-ray diffraction technique and the micro-Vickers hardnes
Matéria (Rio J.). Publicado em: 2016-03
-
4. Caracterización de semielaborados de aleaciones de titanio procesadas por extrusión y laminación perforación (proceso Mannesmann)
ABSTRACTFor the manufacture of seamless pipes and tubes are used, as raw materials, hollow bars from hot deformation processes like extrusion and rotary tube piercing (Mannesmann process). Starting from these semi-elaborated products and by means of successive cross sections reductions through tube drawing or tube rolling (cold pilgering) the requested final
Matéria (Rio J.). Publicado em: 2015-09
-
5. Avaliação da eficácia da desinfecção de instrumentos usados durante o período transoperatório do tratamento endodôntico / Evaluation of the desinfection efficacy of instruments used during the transoperatory period in endodontic treatment
This investigation aimed to evaluate the antimicrobial efficacy of disinfectant agents used to maintain the disinfection of endodontic instruments during the transoperatory period in endodontic treatment. The antimicrobial activity of disinfectants isopropyl alcohol, acetone and peracetic acid were evaluated upon planktonic micro-organisms by time kill assay
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/01/2012
-
6. Furfural - da biomassa ao laboratório de química orgânica
The goal of this manuscript is provide to students of Chemistry and related areas an alternative experiment in which they can obtain a compound and learn to observe and interpret properties and predict organic structure by obtaining furfural from biomass. Furfural is an organic compound, obtained through acid hydrolysis of pentosans, commonly used in the che
Química Nova. Publicado em: 2012
-
7. Microextrusão de peças aplicadas a materiais ferrosos e não ferrosos
This thesis presents the study about microforming, in this case microextrusion of the four different materials, an SAE 1020 steel, an AISI 304 stainless steel, an AA6531 aluminum and a C34000 brass. To evaluate the size effect about microextrusion process, two sizes of specimens were used, with a ¿ 4 mm and another with ¿ 1 mm. For each size of specimen, t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
-
8. Caracterização química de materiais pictóricos usados em escultura policromada : estudo de caso de uma escultura capixaba
O conhecimento das substâncias que constituem as obras de arte é imprescindível para direcionar intervenções nos processos de restauração e conservação, além de fornecer informações sobre o período histórico da elaboração da obra, entendimento da técnica construtiva utilizada pelo artista e reconhecimento de falsificações. Foi escolhida pa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/05/2011
-
9. Efeito do encruamento na cinética de nitretação dos aços inoxidáveis austeníticos
This paper deals with the effects of cold work on the nitriding kinetics and surface micro-hardness of the 3XX family of austenitic stainless steels. Nitriding is a thermo-chemical treatment based on the nitrogen diffusion and, under some specific circumstances, carbon in lower quantities, in to a ferrous matrix. The nitriding process improves particularly h
Publicado em: 2010
-
10. Production and characterization of chitosan and alginate multilayer membranes containing copper / Obtenção e caracterização de membranas multicamadas de quitosana e alginato contendo cobre
Study of membranes has attracted much interest in recent years due to their applicability in areas such as medicine, microelectronics, water treatment, etc. rather than in traditional separation processes. As the application range arises, the need for establishing more elaborated structures also increases. In this context, the present study adapts the layer-
Publicado em: 2009
-
11. Estudo das propriedades e biodegradabilidade de blendas de poliéster/amido submetidas ao ataque microbiano
This work deals with the biodegradation of blends of poly(beta-hydroxybutyrate)/starch and poly(beta-hydroxybutyrate-co-hydroxyvalerate)/starch. The blends were obtained by evaporation of the solvent in the mixture of the polymers in chloroform. Tests were carried out in presence of micro-organisms which acted as biodegradation agents. The blends were consum
Química Nova. Publicado em: 2007
-
12. Estudo do comportamento ao desgaste e corrosÃo dos aÃos inoxidÃveis AISI 316L e AISI 420 depositados pelo processo de aspersÃo tÃrmica a arco elÃtrico
Mechanical components behavior in service, are extremely dependent on the surface quality, the contact between areas and the environment where they are applied. Particularly, corrosion and ware damage, directly and indirectly, mechanical components surface that result in rise production and maintenance cost due to no programmed equipments stops to repair or
Publicado em: 2007