Tecnologia em Metalurgia Materiais e Mineracao最新文献_第8页

Uso de resíduos de tinta em pó de pintura eletrostática para fabricação de revestimentos para piso 利用静电涂料粉末涂料废料制造地坪涂料

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20212522

Carlos Eduardo Bruxel, Sandra Raquel Kunst, Luã Tainachi Mueller, Fernando Dal Pont Morisso, C. Carone, C. T. Oliveira

引用次数: 1

Crescimento de filme de ZnO nanoestruturado por anodização de aço galvanizado 镀锌钢阳极氧化纳米氧化锌膜的生长

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222141

Henrique Gonçalves Pereira, Rubens Camaratta, Cristiane Wienke Raubach Ratmann, Naiane Paiva Stochero

{"title":"Crescimento de filme de ZnO nanoestruturado por anodização de aço galvanizado","authors":"Henrique Gonçalves Pereira, Rubens Camaratta, Cristiane Wienke Raubach Ratmann, Naiane Paiva Stochero","doi":"10.4322/2176-1523.20222141","DOIUrl":"https://doi.org/10.4322/2176-1523.20222141","url":null,"abstract":"Zinc oxide (ZnO) is a broad bandgap semiconductor (3.37 eV) with a wide range of applications, such as catalysts, piezoelectric actuators and transducers, solar cells, microsensors, among others. One way of obtaining ZnO is through the controlled oxidation of metallic zinc, which is the third most consumed metal in the world among the non-ferrous metals with the galvanizing industry being responsible for approximately 57% of the worldwide consumption of this metal. Anodizing is a process of surface treatment consisting of creating an oxide film on the metal surface, being able to retain large amounts of dye. ZnO was obtained by anodizing the galvanized steel which was carried out in a 5mM NaHCO3 electrolytic solution at a constant voltage of 35V with an initial current of 0.2A for 8 minutes. Chemical characterization of the anodized surface, thickness of the layer and verification of the morphology obtained were verified, where it was verified the production of na-nofios with about 100nm of diameter. N479 Black Dye commercial dye was deposited. The results showed the obtaining of a homogeneous layer, with the morphology of nanowires with great layer-city of dye absorption.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70525946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbonetos de WC com fase ligante Co-Ni, comportamento da dureza e resistência à ruptura transversal em função da adição de SiC-± e seus efeitos na temperatura de sinterização 碳化WC与Co- ni相结合，碳化WC的硬度和横向断裂强度随SiC-±的加入及其对烧结温度的影响

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222423

D. Rodrigues, Francisco Yastami Nakamoto, G. Santos, F. Miranda, G. Batalha, L. Fernandes

引用次数: 1

Estudo dos efeitos da aplicação de revestimentos duros em aço baixo carbono através do processo de soldagem SMAW 采用SMAW焊接工艺在低碳钢上应用硬涂层的效果研究

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222397

Abel Eduardo Netto, Almir Turazi

引用次数: 0

Análise do processo de sputtering como alternativa ao processo galvânico 溅射工艺作为电工艺的替代分析

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222416

Mônia Aline Hunger Geiger, Luã Tainachi Mueller, Fernando Dal Pont Morisso, Sandra Raquel Kunst, C. Carone, C. T. Oliveira

{"title":"Análise do processo de sputtering como alternativa ao processo galvânico","authors":"Mônia Aline Hunger Geiger, Luã Tainachi Mueller, Fernando Dal Pont Morisso, Sandra Raquel Kunst, C. Carone, C. T. Oliveira","doi":"10.4322/2176-1523.20222416","DOIUrl":"https://doi.org/10.4322/2176-1523.20222416","url":null,"abstract":"The galvanic process has a high degree of pollution due to the amount of effluents generated and the toxicity of the chemicals used in the process. You know if hexavalent chromium is known as a carcinogen and the associated residues are dangerous and difficult to use. In view of this, the development of new technologies has been used to use corrosion resistant, environmentally friendly and economically viable processes. An alternative technology that can meet this need is PVD physical vapor deposition, with a spray process. In this context, this study aims to evaluate and compare the performance of aluminum coatings applied by sputtering with varnish in relation to the performance of the electrodeposited chrome coating. For that, the coatings were applied in zamak and were characterized morphologically and electrochemically. The results shown when the aluminum finishes deposited by spraying show equivalent characteristics both in electrochemical performance and in morphological tests when compared to the chrome plating in the conventional process (electroplating), being an alternative of substitution with sustainable use.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Caracterização da rocha fosfática de Angico dos Dias (Bahia) e identificação dos minerais portadores de terras raras Angico dos Dias (Bahia)磷矿的表征和稀土矿物的鉴定

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222675

Mariana M. Gonçalves Santos, Luiz Rogério Pinho de Andrade Lima

{"title":"Caracterização da rocha fosfática de Angico dos Dias (Bahia) e identificação dos minerais portadores de terras raras","authors":"Mariana M. Gonçalves Santos, Luiz Rogério Pinho de Andrade Lima","doi":"10.4322/2176-1523.20222675","DOIUrl":"https://doi.org/10.4322/2176-1523.20222675","url":null,"abstract":"The Angico dos Dias carbonate phosphate rock deposit has been exploited and treated in a dry processing plant that includes classification and low, medium and high intensity magnetic concentration. The non-magnetic fraction is used in the production of fertilizers and the fines and magnetic fractions are discarded as tailings. Previous studies indicate the relevant presence of light rare-earth elements and low concentrations of thorium and uranium in the ore. The objective of this work was to characterize the ore, the concentrate and the magnetic tailings of the plant. The results of chemical and mineralogical analyzes indicate that the ore, the product and the tailings are rich in calcium, phosphorus, iron, silicon, aluminum and magnesium. The total content of rare earths is greater than 9 g/kg in the ore and 6 g/kg in the magnetic tailings. The main constituents of the ore are: fluorapatite, hydrobiotite and vermiculite. More detailed analyzes show that cerium, lanthanum, neodymium and samarium are present in the structure of apatite and in monazite particles. Cerium is also found in another mineral without association with other rare earth elements. The results also indicate that the fertilizer production process, with acid attack, promotes the leaching of a significant portion of light rare earth elements contained in apatite and cerianite, which may allow their recovery without significant additional costs.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inclusion of the geometallurgical variable specific energy in the mine planning using direct block scheduling 采用直接分块调度方法将地貌学变量比能纳入矿山规划

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222677

J. Mata, Alizeibek Saleimen Nader, D. Mazzinghy

引用次数: 1

Tratamento térmico para desfosfatização de monazita e recuperação dos elementos das terras raras 独居石脱磷化和稀土元素回收的热处理

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222637

Ana Carolina de Souza, Luiz Rogério Pinho de Andrade Lima

{"title":"Tratamento térmico para desfosfatização de monazita e recuperação dos elementos das terras raras","authors":"Ana Carolina de Souza, Luiz Rogério Pinho de Andrade Lima","doi":"10.4322/2176-1523.20222637","DOIUrl":"https://doi.org/10.4322/2176-1523.20222637","url":null,"abstract":"Brazil has the second largest reserve of monazite, which is one of the three main minerals bearing of rare earth elements. In this study, a monazite concentrate, derived from the occurrence of heavy minerals in the coastal strips of the states of Bahia and Espírito Santos, was used. The best way to analyze aqueous solutions rich in rare earths by ICP-OES was also evaluated. In this work, the steps used to obtain an aqueous solution rich in rare earths from the monazite concentrate involved the following steps: addition of NaOH to the concentrate, heating at 400 ºC for 3 hours, washing with water and subsequent leaching of the remaining solid phase with HCl. Chemical and mineralogical characterizations were accomplished on the products of this process and the results indicated that the initial concentrate is rich in light rare earths, the alkaline fusion product is predominantly composed of rare earth hydroxides and free of NaOH. The acid leaching tailings showed to be rich in zirconite, indicating that the dissolution of the rare earth hydroxides formed in the previous step was complete. Spectral interferences in the lines of the predominant elements were considered in the ICP-OES analysis using individual patterns of these elements. The following lines were defined for the predominant elements: Ce 456.236 nm, Th 283.730 nm, La 384.902 nm, Nd 430.058 nm, Pr 390.844 nm, and Sm 428,079 nm. The leachate obtained after acid leaching of rare earth hydroxides was analyzed by this method and the concentrations of the predominant elements (in g/L) were: Ce 32.81, Th 14.76, La 8.58, Nd 3.35, Pr 3.02, and Sm 1.28","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Case study on the failure analysis of turbojet compressor blades 涡喷发动机压气机叶片失效分析实例研究

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222760

Jéssica Silva Rocha Pinho, L. Campanelli, D. Reis

引用次数: 2

Comportamento microestrutural e de fluência do Inconel 718 após tratamento térmico de duplo envelhecimento 英科乃尔718双时效热处理后的显微组织和蠕变行为

Tecnologia em Metalurgia Materiais e Mineracao Pub Date : 2022-01-01 DOI: 10.4322/2176-1523.20222592

Fabrícia Assis Resende Gonçalves, Renata Jesuina Takahashi, Danieli Aparecida Pereira Reis

引用次数: 0