Revista Colombiana de Materiales最新文献

FLORY-HUGGINS INTERACTION PARAMETER FOR PVA-WATER IN HYDROGELS PREPARED BY TWO METHODS: FREEZING/THAWING AND CROSSLINKING WITH CITRIC ACID 冷冻/解冻和柠檬酸交联制备的水凝胶中pva-water的Flory-huggins相互作用参数

Revista Colombiana de Materiales Pub Date : 2022-09-14 DOI: 10.17533/rcm/udea.rcm.n19a06

Carmiña Gartner Vargas

{"title":"FLORY-HUGGINS INTERACTION PARAMETER FOR PVA-WATER IN HYDROGELS PREPARED BY TWO METHODS: FREEZING/THAWING AND CROSSLINKING WITH CITRIC ACID","authors":"Carmiña Gartner Vargas","doi":"10.17533/rcm/udea.rcm.n19a06","DOIUrl":"https://doi.org/10.17533/rcm/udea.rcm.n19a06","url":null,"abstract":"PVA hydrogels are largely used for biomedical applications due to their biodegradability, biocompatibility, and suitable mechanical strength. These hydrogels can be synthetized by several methods. In this work hydrogels were obtained by two methods, freezing/thawing, and crosslinking with citric acid. The degree of swelling for both types of hydrogels was in the range of 60-70% which corresponds to a medium degree of swelling. Young’s modulus measurements gave values in the range of 0.20 to 4.00 MPa, which are proper values for tissue regeneration or wound healing applications. Crosslinking degree was found to be higher for the freezing/thawing hydrogels, in agreement with a lower percentage of hydration and a higher modulus. By means of the Flory-Rehner model, the interaction parameter (χ) of PVA - water was calculated. This value depends on the availability of OH groups in the polymer. The highest value of c was found for the hydrogels crosslinked with citric acid, revealing that their water-polymer interactions are weaker than those occurring in freezing/thawing hydrogels, which has more available OH groups. However, values higher than 0.5 were found for both types of hydrogels, indicating insolubility in water; therefore, these values imply mechanical stability in aqueous solutions for a relative long time. It is concluded that freezing/thawing is a more reproducible method, which allows the modulation of the crosslinking degree, perhaps, the most important parameter to be controlled.","PeriodicalId":109457,"journal":{"name":"Revista Colombiana de Materiales","volume":"95 16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129144780","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

EVALUACIÓN DE TRATAMIENTOS DE Q&P SOBRE ACEROS FUNDIDOS MEDIO CARBONO-ALTO SILICIO 中碳高硅钢问答处理的评价

Revista Colombiana de Materiales Pub Date : 2022-09-13 DOI: 10.17533/rcm/udea.rcm.n19a02

María José Oyola, R. Aristizábal, Óscar Ríos

引用次数: 0

FUSIÓN LÁSER EN CAMA DE POLVOS DE UN VIDRIO METÁLICO BASE HIERRO: ESTUDIO EXPLORATORIO 铁基金属玻璃粉末床中的激光熔化:探索性研究

Revista Colombiana de Materiales Pub Date : 2022-09-13 DOI: 10.17533/rcm/udea.rcm.n19a04

John Dairo Henao Penenrey

{"title":"FUSIÓN LÁSER EN CAMA DE POLVOS DE UN VIDRIO METÁLICO BASE HIERRO: ESTUDIO EXPLORATORIO","authors":"John Dairo Henao Penenrey","doi":"10.17533/rcm/udea.rcm.n19a04","DOIUrl":"https://doi.org/10.17533/rcm/udea.rcm.n19a04","url":null,"abstract":"Actualmente, la fabricación de componentes volumétricos a partir de vidrios metálicos y/o aleaciones fuera del equilibrio es un reto debido a las condiciones de enfriamiento requeridas para obtener un estado amorfo completo y/o un conjunto de fases en particular. Algunas tecnologías de fabricación aditiva, como la sinterización directa de metal por láser (DMLS), pueden ofrecer una alternativa para la fabricación de componentes de vidrio metálico a partir de polvos de materia prima 100 % amorfos. El principal desafío cuando estos materiales se procesan mediante fabricación aditiva es mantener el contenido amorfo del polvo inicial en las piezas finales. En el presente trabajo, se empleó un vidrio metálico comercial con hierro como su elemento principal, con el fin de realizar un estudio exploratorio de la influencia de los principales parámetros del proceso DMLS sobre la capacidad de este material para formar piezas consolidadas por este proceso. Los parámetros estudiados aquí fueron la potencia del láser, la velocidad de escaneo y la densidad de energía volumétrica. Se empleó la técnica de difracción de rayos X para realizar la caracterización de las fases obtenidas en las piezas fabricadas. Los resultados del estudio sugieren que la fabricación de piezas con el material estudiado es posible, pero existe un rango de densidades de energía aplicadas por el láser durante el proceso dentro de los que se favorece la formación de las piezas.","PeriodicalId":109457,"journal":{"name":"Revista Colombiana de Materiales","volume":"17 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120913964","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

COMPACTED ADOBES FROM GRAVEL AND SAND WASH MUDS OF AN AGGREGATES PLANT AS WASTES VALORIZATION STRATEGY 从砾石和砂洗泥的集料厂压实的土坯作为废物增值策略

Revista Colombiana de Materiales Pub Date : 2022-09-13 DOI: 10.17533/rcm/udea.rcm.n19a05

Francisco Dario Cabrera Poloche, Oscar Jaime Restrepo Baena, J. Tobón, Sergio Escudero Restrepo, Stephanie Álvarez Zuluaga

{"title":"COMPACTED ADOBES FROM GRAVEL AND SAND WASH MUDS OF AN AGGREGATES PLANT AS WASTES VALORIZATION STRATEGY","authors":"Francisco Dario Cabrera Poloche, Oscar Jaime Restrepo Baena, J. Tobón, Sergio Escudero Restrepo, Stephanie Álvarez Zuluaga","doi":"10.17533/rcm/udea.rcm.n19a05","DOIUrl":"https://doi.org/10.17533/rcm/udea.rcm.n19a05","url":null,"abstract":"Fine waste management from quarry has been commonly the final disposal in mining tailings and as refilling material for landscape recovery in areas already exploited. However, different uses of these wastes have been studied, highlighting the earth constructions because a new economic benefit is generated and the environmental impact is reduced. Moreover, compared to cement constructions, the earth constructions are environmentally friendly and represent an energy saving, due to their low emission of CO2 by low or no-cement content in their manufacture in contrast to good physical and mechanical properties obtained. So, in this work, the use of wastes muds from an aggregates plant (as result of crushing and washing process) were evaluated as a circular economy strategy. Raw materials were chemical, mineralogical and physically characterized and were employed in the elaboration of cubic specimens of un-calcined material, which they were hydraulically compacted in metal molds at mixtures of wastes muds, commercial gray cement and washed fine sand. The cubic specimen’s performance was evaluated by Simple Compressive Strength (SCS) and water absorption test. In the best of configurations, an increase in SCS of 221.3% (reaching 8 MPa) on samples of 20% cement with respect to samples of only waste was found and, in turn, an increase of 517.3% (reaching 15 MPa) when these were cured in water was also found. Thus, wastes mixed with small amounts of cement are promising in the Manufacture of Compacted Adobes (MCA), particularly as masonry or structural elements made of un-calcined wastes.","PeriodicalId":109457,"journal":{"name":"Revista Colombiana de Materiales","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124448868","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: 1

ESTUDIO MICROESTRUCTURAL DE UN ACERO FUNDIDO ALTO CARBONO-ALTO SILICIO SOMETIDO A TRATAMIENTOS TÉRMICOS DE AUSTEMPERADO Y Q&P 奥氏体回火和Q&P热处理下高碳高硅钢的显微组织研究

Revista Colombiana de Materiales Pub Date : 2022-09-13 DOI: 10.17533/rcm/udea.rcm.n19a03

Catheryne Tobon, Ricardo Aristizábal Sierra, Oscar eduardo Ríos Diez

{"title":"ESTUDIO MICROESTRUCTURAL DE UN ACERO FUNDIDO ALTO CARBONO-ALTO SILICIO SOMETIDO A TRATAMIENTOS TÉRMICOS DE AUSTEMPERADO Y Q&P","authors":"Catheryne Tobon, Ricardo Aristizábal Sierra, Oscar eduardo Ríos Diez","doi":"10.17533/rcm/udea.rcm.n19a03","DOIUrl":"https://doi.org/10.17533/rcm/udea.rcm.n19a03","url":null,"abstract":"En el presente trabajo se estudió la influencia de la estructura de partida de un acero alto C – alto Si, as-cast (AC), deformado en caliente (DC) y homogenizada (H), sobre la microestructura producto de aplicar tratamientos térmicos de baja temperatura: austemperado y Quenching and Partitioning (Q&P). Para tal efecto, se austemperaron muestras del a 300°C durante 120 min y se trataron también, vía Q&P, con el ciclo de QT a 180°C/2 min., y PT a 200°C/30min. La caracterización del material se realizó por medio de microscopía óptica (MO), microscopia electrónica de barrido (MEB), análisis de difracción de rayos X (DRX) y mediciones de microdureza Vickers. Los resultados mostraron que las muestras en estado AC y DC presentaron patrones de segregación marcados, lo que afectó las cinéticas de transformación en estado sólido y por ende favoreció un alto grado de heterogeneidad en la estructura final. Por su parte, las muestras H, no evidenciaron patrones de segregación y los niveles de transformación presentaron un alto grado de uniformidad en las estructuras bainíticas y martensítica producto de los ciclos térmicos aplicados.","PeriodicalId":109457,"journal":{"name":"Revista Colombiana de Materiales","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132651196","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

SÍNTESIS Y CARACTERIZACIÓN DE ALEADOS DE Mg 20% Y 40% MASA DE Ti PREPARADOS POR ALEACIÓN MECÁNICA 机械合金制备的20% Mg和40% Ti合金的合成与表征

Revista Colombiana de Materiales Pub Date : 2022-09-13 DOI: 10.17533/rcm/udea.rcm.n19a01

Verónica Del Valle González Malavé, Ney José Luiggi Agreda

引用次数: 0

PROCESAMIENTO DE MATERIALES METÁLICOS 金属材料加工

Revista Colombiana de Materiales Pub Date : 2022-09-13 DOI: 10.17533/rcm/udea.rcm.n19a00

Oscar eduardo Ríos Diez

引用次数: 0

CALCINATION OF PHOSPHORIC ROCK BY TORCH PLASMA, TO OBTAIN THERMOPHOSPHATES FERTILIZERS 用火炬等离子体煅烧磷矿，以获得热磷酸盐肥料

Revista Colombiana de Materiales Pub Date : 2022-03-23 DOI: 10.17533/rcm/udea.rcm.n18a05

Nelson Mauricio Espinel Pérez, M. Pazos, E. Parra, D. Martínez

{"title":"CALCINATION OF PHOSPHORIC ROCK BY TORCH PLASMA, TO OBTAIN THERMOPHOSPHATES FERTILIZERS","authors":"Nelson Mauricio Espinel Pérez, M. Pazos, E. Parra, D. Martínez","doi":"10.17533/rcm/udea.rcm.n18a05","DOIUrl":"https://doi.org/10.17533/rcm/udea.rcm.n18a05","url":null,"abstract":"Se utilizó un reactor de plasma de antorcha para la obtención de fertilizantes termofosfatos (TPIZA y TPPC) sometiendo la roca fosfórica (PR) de la región centro oriente del departamento de Boyacá, Colombia, proveniente de los municipios de Iza y Sogamoso, a calcinación mediante plasma de antorcha. Se utilizó un equipo de antorcha de plasma de 7.6 kW (potencia nominal) con temperaturas de proceso > 10000 ° C, tamaño de partícula de 0.074 mm y tiempos de calcinación de 30 s - 40 s. Como resultado experimental se obtuvieron concentraciones máximas de fósforo total y fósforo asimilable correspondientes a 27.0% P2O5 y 3.07% P2O5 a partir de termofosfatos de Iza (TPTP - IZA) mientras que los resultados para los termofosfatos de Sogamoso (TPTP - PC) fueron 33.12% P2O5 y 4.83 % P2O5. Los análisis de fósforo total se realizaron por fluorescencia de rayos X (FRX) y para la determinación del fósforo asimilable se realizó primero la extracción con solución neutra de citrato de amonio y posteriormente la determinación cuantitativa por espectrofotometría UV - Vis. Mediante difracción de rayos X (DRX), se determinó que la fase cristalina predominante fue el carbonato de fluorapatita, que osciló entre 53.0% - 87.0% (TPTP - IZA) y 60.6% - 93.7% (TFTP - PC). Los costes energéticos de los fertilizantes obtenidos reportaron un consumo energético muy bajo, del orden de 0.64 kWh / Kg – 1.14 kWh / Kg, al utilizar intensidades eléctricas de 30 A y 45 A.","PeriodicalId":109457,"journal":{"name":"Revista Colombiana de Materiales","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124608537","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

FORMULATION AND CHARACTERIZATION OF CERAMIC PARTS FOR COATINGS MADE FROM THE PRODUCTS OF COMBUSTION OF MINERAL COAL 矿物煤燃烧产物涂料陶瓷部件的配方和特性

Revista Colombiana de Materiales Pub Date : 2022-02-09 DOI: 10.17533/rcm/udea.rcm.n18a04

Jessica Lopes da Silva, J. L. Cardoso, Cândido Jorge de Sousa Lobo, Ricardo Emílio Ferreira Quevedo Nogueira, Halisson De Souza Pinheiro, Marcos Rinaldo Carvalho Cunha Júnior

引用次数: 0

PREDICCION Y ESTUDIO DE DRENAJE ÁCIDO DE MINA SOBRE MINERAL DE ESCOMBRERA 矿渣酸性排水的预测与研究

Revista Colombiana de Materiales Pub Date : 2022-02-09 DOI: 10.17533/rcm/udea.rcm.n18a01

Ana Alicia Senese Leiva

引用次数: 0