Cerâmica最新文献_第10页

Efeito do ácido esteárico em scaffolds de alumina obtidos por manufatura aditiva usando o método de fabricação por filamento fundido 硬脂酸对铸丝增材制造氧化铝支架的影响

Cerâmica Pub Date : 2021-12-01 DOI: 10.1590/0366-69132021673843182

M. Faccio, E. Thomazi, L. R. Silva, J. Catafesta, J. E. Zorzi

引用次数: 1

Application of slaker grits industrial waste as a primary calcium oxide source in a ceramic frit formulation 石粉工业废渣作为氧化钙初级源在陶瓷烧结配方中的应用

Cerâmica Pub Date : 2021-12-01 DOI: 10.1590/0366-69132021673843107

V. D. Santos, M. D. Cabrelon, E. Trichês, E. Quinteiro

引用次数: 0

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite 镍与La取代六铁氧体钙的结构与磁性比较研究

Cerâmica Pub Date : 2021-09-01 DOI: 10.1590/0366-69132021673833111

V. S. Shinde, S. G. Dahotre, K.E.S. Anandibai

引用次数: 3

Synthesis of brushite/polyethylene glycol cement for filler in bone tissue injuries 骨组织损伤填充剂刷石/聚乙二醇水泥的合成

Cerâmica Pub Date : 2021-09-01 DOI: 10.1590/0366-69132021673833054

Otto Cumberbatch Morúa, M. Cardoso, H. N. D. Silva, R. Carrodeguas, Miguel A. Rodríguez, M. Fook

引用次数: 3

Synthesis and characterization of Fe3O4-NH2 and Fe3O4-NH2-chitosan nanoparticles Fe3O4-NH2和Fe3O4-NH2壳聚糖纳米颗粒的合成与表征

Cerâmica Pub Date : 2021-09-01 DOI: 10.1590/0366-69132021673833101

M. L. Silveira, I. Silva, A. G. Magdalena

引用次数: 3

Interference of natural vibrations in four-point bending test on beams with asphalt composite made with calcined clay aggregate 煅烧粘土集料沥青复合材料梁四点弯曲试验中固有振动的干扰

Cerâmica Pub Date : 2021-09-01 DOI: 10.1590/0366-69132021673833032

A. Silva, C. E. D. Silva, A. K. C. Monteiro, C. A. Frota

引用次数: 0

Effect of MgO addition on the sinterability and mechanical properties of mullite ceramics 添加氧化镁对莫来石陶瓷烧结性能和力学性能的影响

Cerâmica Pub Date : 2021-09-01 DOI: 10.1590/0366-69132021673833075

T. A. Olcoski, A. Chinelatto, A. Chinelatto

{"title":"Effect of MgO addition on the sinterability and mechanical properties of mullite ceramics","authors":"T. A. Olcoski, A. Chinelatto, A. Chinelatto","doi":"10.1590/0366-69132021673833075","DOIUrl":"https://doi.org/10.1590/0366-69132021673833075","url":null,"abstract":"Mullite is a refractory material with singular properties, although high temperatures and long sintering times are required to obtain this material with good densification. In this study, aluminum hydroxide and colloidal silica were used to produce mullite through reactive sintering and MgO was employed as a sintering additive. The compositions were prepared with different amounts of MgO and sintered at 1350, 1450, and 1550 °C, and then analyzed using X-ray diffraction, scanning electron microscopy, and measurements of apparent porosity (AP) and flexural strength. The results showed that the raw materials used allowed the mullite formation at relatively low temperatures (1350 °C), regardless of the amount of MgO added but with the increase in MgO content, a spinel phase appeared, resulting in a fraction of residual α-alumina. The MgO addition lowered the densification temperature at around 50 °C. Furthermore, the higher the sintering temperature and the MgO content, the larger and more anisotropic the mullite grains were. At sintering temperatures above 1450 °C, AP was reduced to approximately 10%. The MgO addition and increase in sintering temperature improved the flexural strength of mullite materials.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67183405","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: 2

Obtaining zeolite A from filtrate of zeolite LSX and its influence on the removal of heavy metals and organic pollutants in spent lubricating oil 从LSX沸石滤液中提取A沸石及其对废润滑油中重金属和有机污染物去除的影响

Cerâmica Pub Date : 2021-09-01 DOI: 10.1590/0366-69132021673833108

R. Kwakye, A. Aniagyei, B. Kwakye-Awuah, B. Y. Vibgedor, B. Asimeng

引用次数: 1

Influence of particle size distribution of conventional fine aggregate and construction demolition waste aggregate in Portland cement mortar 硅酸盐水泥砂浆中常规细骨料和建筑拆迁废骨料粒径分布的影响

Cerâmica Pub Date : 2021-09-01 DOI: 10.1590/0366-69132021673833035

P. Kruger, P. Serbai, A. Chinelatto, E. Pereira

{"title":"Influence of particle size distribution of conventional fine aggregate and construction demolition waste aggregate in Portland cement mortar","authors":"P. Kruger, P. Serbai, A. Chinelatto, E. Pereira","doi":"10.1590/0366-69132021673833035","DOIUrl":"https://doi.org/10.1590/0366-69132021673833035","url":null,"abstract":"Recycled aggregates present a varied mineralogical composition and the grading of these particulates over their particle size distribution influence the aggregate properties as well as those of the composites that they form. This study proposed a comparative investigation of the influence of the particle size distribution of fine aggregates from two different origins, namely, natural crushed stone and construction and demolition waste (CDW). Three particle size distributions were defined, so that each aggregate had its fineness modulus (FM) ranked in the granulometric ranges, following the NBR 7211 Brazilian standard. The following tests were carried out: consistency, bulk density in the fresh state, compression strength, absorption (by immersion and capillarity), dimensional and mass variation. The results showed that the aggregate mineralogical composition impacted the mortar properties and that, when analyzed along with the particle size distribution, CDW showed different and varied behavior as a function of its particle size and distribution. Another finding was that mortars produced with CDW aggregate with granulometry below the lower optimal zone (FM<2.20) presented reduced mechanical and physical performance. Therefore, it was concluded that CDW aggregates should not be included in the same standards as conventional aggregates regarding the fine aggregate granulometric composition.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49443554","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

Photocatalytic decolorization of an azo dye employing TiO2 anatase/brookite compounds obtained by hydrothermal methods 水热法制备锐钛矿/蓝铜矿复合TiO2光催化偶氮染料脱色

Cerâmica Pub Date : 2021-09-01 DOI: 10.1590/0366-69132021673833121

A. R. Teixeira, L. Pontes, I. Santos

{"title":"Photocatalytic decolorization of an azo dye employing TiO2 anatase/brookite compounds obtained by hydrothermal methods","authors":"A. R. Teixeira, L. Pontes, I. Santos","doi":"10.1590/0366-69132021673833121","DOIUrl":"https://doi.org/10.1590/0366-69132021673833121","url":null,"abstract":"Abstract Titanium dioxide is a widely studied material with well-known applications for anatase and rutile phases. Moreover, brookite, another polymorph, which is more difficult to obtain, has caught scientific community interest, especially for photocatalysis applications. Among many methodologies for TiO2 synthesis, the hydrothermal method stands out, with the possibility of controlling different parameters that lead to a specific phase composition, allowing selective polymorphic obtainment. This method was used to synthesize TiO2 with different anatase/brookite ratios, by the use of different synthesis conditions as pH of the suspension, sodium salt concentration, and temperature, resulting in anatase-brookite photocatalyst with brookite composition ranging from 0 to 35%. The materials were characterized by X-ray diffraction, infrared spectroscopy, Raman spectroscopy, particle size measurement, and scanning electron microscopy. Photocatalysts with the highest brookite amount showed the best photocatalytic results for Remazol golden yellow (RNL) dye decolorization. Moreover, the short-range disorder also played an important role in photocatalytic behavior.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67183381","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