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6. Micrograded ceramic-metal composites

Author

Guisard Restivo, Thomaz Augusto, Beccari, Rafael Fonseca, Padilha, Wellington Rafael, Durazzo, Michelangelo, Telles, Victor Bridi, Coleti, Jorge, Yamagata, Chieko, Silva, Antonio Carlos da, Suzuki, Eduardo, Soares Tenório, Jorge Alberto, and Mello-Castanho, Sonia Regina Homem

Published
2019
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21. Redução das emissões de gases de efeito estufa através do uso de hidrogênio na siderurgia

Author

Rodrigues, Girley Ferreira, Junca, Eduardo, Telles, Victor Bridi, and Espinosa, Denise Crocce Romano

Subjects
Environmental sciences, hidrogênio, redução de CO2, siderurgia, hidrogênio, redução de co2, siderurgia, GE1-350
Abstract

Atualmente, novos processos que emitem menor quantidade de CO2 e que geram menos resíduos são necessários. A comunidade internacional do aço está confrontada com o desafio de desenvolver processos que tornam a produção de aço mais sustentável no futuro. Este artigo descreve a análise de gases a partir da redução de pelotas de minério de ferro utilizando uma mistura de gás inerte e hidrogênio como gás redutor. Foi utilizada uma balança termogravimétrica acoplada a um espectrômetro de massa para realização dos experimentos. Pode-se concluir que a utilização de hidrogênio na redução de minério de ferro é uma alternativa na tentativa de minimizar a emissão de gases causadores do efeito estufa.

Published
2011

23. Low-temperature densification of ceramics and cermets by the intermediary stage activated sintering method.

Author

Restivo, Thomaz Augusto Guisard, Durazzo, Michelangelo, de Mello-Castanho, Sonia Regina Homem, Moreira, Ana Cugler, Graciano, Sergio, Telles, Victor Bridi, and Tenorio, Jorge Alberto Soares

Subjects
CERAMIC metals, LOW temperatures, SOIL densification, SINTERING, CRYSTAL structure
Abstract

The article explores new concepts in order to promote ceramic and cermet materials sintering at lower temperatures between 1200 and 1300 °C. The principle of the new process method called intermediary stage activated sintering (ISAS) involves the preparation of the ceramic powder with dispersed doping agents, such as nanotubes and fibers, which shape the pore structure at pressed pellets with stable interconnected thin cylinders between the grains. This feature resembles and extends the condition found during the intermediary stage sintering, which enhances the ions diffusion rate along tubular pores to increase shrinkage. Carbon nanotubes (CNT) and nanofibers are homogenized into cubic zirconia and alumina in amounts ranging from 1 to 10 vol% at high-energy milling devices and ultrasound disruptor under ethanol media. Ni, Cu and Mo/MoO can be also added to provide tubular channel filling. Sintering of uniaxially pressed pellets is carried out in a dilatometer and tubular furnaces at 1200/1300 °C under air, argon and controlled oxygen partial pressure atmospheres. TG/DTA/MS analyses of sample pellets reveal the oxidation and gas release temperature and duration. The results demonstrate the ISAS process concept is valid since it further increases the ceramic final density by 8% of the theoretical density at 1200 °C, leading to close the porosity at 1300 °C, compared to 1500-1600 °C temperatures at conventional process. Short CNT and cellulose nanofiber were found to be the best additives in this sense. [ABSTRACT FROM AUTHOR]

Published
2018
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31. ANALYSIS OF GAS ARISING FROM IRON ORE REDUCTION BY HYDROGEN.

Author

Ferreira Rodrigues, Girley, Junca, Eduardo, Telles, Victor Bridi, Soares Tenório, Jorge Alberto, and Romano Espinosa, Denise Crocce

Abstract

Processes that produce less CO2 and less net waste materials and emissions and that consume less energy are required. The international steel community is faced with the challenge of developing processes that will make steel production more sustainable in the future. This article describes the analysis of gases from the reduction of iron ore pellets. Was used a mixture of inert gas and hydrogen as reductor gas. It was used a thermogravimetric balance coupled to a mass spectrometer. The results are expected to better understand the direct reduction process. [ABSTRACT FROM AUTHOR]

Published
2012

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