Journal of Boron最新文献_第9页

Investigation of the structural and magnetic properties of amorphous/nanocrystalline Fe70Ti10B20 (%at.) alloys by mechanical alloying 机械合金化非晶/纳米晶Fe70Ti10B20 (%at.)合金的结构和磁性能研究

Journal of Boron Pub Date : 2019-06-30 DOI: 10.30728/BORON.500470

Tuncay Simsek

{"title":"Investigation of the structural and magnetic properties of amorphous/nanocrystalline Fe70Ti10B20 (%at.) alloys by mechanical alloying","authors":"Tuncay Simsek","doi":"10.30728/BORON.500470","DOIUrl":"https://doi.org/10.30728/BORON.500470","url":null,"abstract":"In this study, amorphous/nanocrystalline Fe 70 Ti 10 B 20 (at.%) alloys were synthesized by using elemental Fe, Ti and B powders under argon gas atmosphere via mechanical alloying method. The powders were ball milled at 20:1 ball-to-powder ratio and 500 rpm rotating speed up to 70 h. The phase and morphological properties of the synthesized powders were examined by using X-Ray diffractometer and scanning electron microscope with energy-dispersive X-ray spectroscope (SEM/EDX). The magnetic properties of powders were determined by vibrating sample magnetometer (VSM) at room temperature in the range of 0-20 kOe. It is determined that after 2.5 h of milling, Ti and B are started to dissolve in Fe lattice and Fe(TiB) solid solutions formed. XRD analysis revealed that the amorphous structures were formed after 30h of milling and the crystallite size and lattice strain were found ~ 8.2 nm and 1.16%, respectively. SEM images indicated that the particles were mostly agglomerated and the particles size distribution was in the range of 10-48 μm. Magnetic measurements revealed that after 70 h of milling, the saturation magnetization (M s ) and the coercivity (H c ) was about 94 emu/g and 117 Oe.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123555135","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

DÜŞÜK ORANLARDA BOR İÇEREN AZ KARBONLU ÇELİKLERİN ASİDİK VE TUZLU ORTAMLARDA KOROZYON ÖZELLİKLERİNİN İNCELENMESİ

Journal of Boron Pub Date : 2019-03-16 DOI: 10.30728/BORON.421683

Kubilay Karacif, Cemal Çarboğa, Duygu Candemir

引用次数: 1

Surface Modification of Anhydrous Borax Powders with Stearic Acid via Mechanical Dry Powder Coating 机械干粉涂覆硬脂酸对无水硼砂粉体的表面改性

Journal of Boron Pub Date : 2019-03-16 DOI: 10.30728/BORON.414410

S. Akpınar, Zeyni Arsoy, R. S. Şenol

{"title":"Surface Modification of Anhydrous Borax Powders with Stearic Acid via Mechanical Dry Powder Coating","authors":"S. Akpınar, Zeyni Arsoy, R. S. Şenol","doi":"10.30728/BORON.414410","DOIUrl":"https://doi.org/10.30728/BORON.414410","url":null,"abstract":"Surface modification of anhydrous borax powders with stearic acid in the laboratory-scale planetary ball mill via mechanical dry powder coating approach was investigated. The alteration of hydrophilic surface properties of anhydrous borax with stearic acid was optimized by modifier amount and activation time. The cohesion mechanisms of powders, which processed at conditions of 0.5, 1 and 2 wt. % stearic acid amount with the function of 30, 60 and 120 minute activation time, were evaluated in terms of the solubility test, contact angle measurements, particle size distributions, and scanning electron microscopy (SEM) analysis. Results indicate that anhydrous borax surface could be switched from hydrophilic to hydrophobic with changing contact angle from wetting (17 o ) to non-wetting (99 o ). Water-insoluble amount of anhydrous borax powders, as a coating efficiency indicator, was increased from 73 % to 91 % by coating with 1 wt. % stearic acid for 60 min. Furthermore, SEM analysis results demonstrate that stearic acid was discretely coated over the anhydrous borax surface. As a conclusion, an effective mechanical dry coating processing by a one-step coating approach could be applied to obtain a modified anhydrous borax surface, which offers controlled solubility behaviour in water-based suspensions.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123433465","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

A critical review on the determination of boron in various matrices 各种基质中硼的测定方法综述

Journal of Boron Pub Date : 2019-03-16 DOI: 10.30728/BORON.459258

A. Türker, A. Türker

引用次数: 5

Structural and Luminescence Properties of Li3Y2(BO3)3 Synthesized by Solid-State Reactions 固态反应合成Li3Y2(BO3)3的结构和发光性质

Journal of Boron Pub Date : 2018-11-26 DOI: 10.30728/BORON.360284

Ş. Gacanoğlu, H. Güler, A. Teke, R. Tülek

{"title":"Structural and Luminescence Properties of Li3Y2(BO3)3 Synthesized by Solid-State Reactions","authors":"Ş. Gacanoğlu, H. Güler, A. Teke, R. Tülek","doi":"10.30728/BORON.360284","DOIUrl":"https://doi.org/10.30728/BORON.360284","url":null,"abstract":"A new binary metal borate compound, trilithium diyttrium orthoborate, Li 3 Y 2 (BO 3 ) 3 was successfully synthesized by a solid-state reaction at 1000°C using the initial reactants of Li 2 CO 3 , Y 2 O 3 , and H 3 BO 3 (mole ratio 1.5:1:3). The phase analysis, crystallinity and size distribution of Li 3 Y 2 (BO 3 ) 3 was investigated by X, ray powder diffraction (XRD) and Scanning Electron Microscopy (SEM). It was found that single phase Li 3 Y 2 (BO 3 ) 3 crystallizes in orthorhombic crystal system with refined unit cell parameters of a=8.9228, b=9.5840(7), c=20.4469A, Z=9, and represent the space group of Pmmm. Particles size distribution estimated from the SEM images are in the range of 20 to 200 µm. The luminescence properties of Li 3 Y 2 (BO 3 ) 3 were investigated by using steadystate photoluminescence (PL) measurement as a function of temperature. The spectra are dominated by transitions related to defects present in the sample, in the visible region of the spectrum. A relatively low intensity band-to-band transition was also observed at high energy side of the spectrum centered at around 3.33 eV. This peak is decomposed to two close peaks at 3.32 and 3.35 eV using Gauss fitting. From the temperature behavior of peak energies of these emissions, the band gap of Li 3 Y 2 (BO 3 ) 3 is estimated to be 3.35 eV for the first time.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114686419","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

Theoretical study of B segregation in Mo(110) 钼(110)中B偏析的理论研究

Journal of Boron Pub Date : 2018-11-26 DOI: 10.30728/BORON.411591

C. Tayran

引用次数: 2

High Temperature Oxidation Behavior of Boron Carbide 碳化硼的高温氧化行为

Journal of Boron Pub Date : 2018-11-26 DOI: 10.30728/BORON.365224

E. Dokumacı, İ. Özkan, A. B. Önay

引用次数: 2

Synthesis of VB2-V3B4-V2B3/VC hybrid powders via powder metallurgy processes 粉末冶金法制备VB2-V3B4-V2B3/VC杂化粉体

Journal of Boron Pub Date : 2018-11-26 DOI: 10.30728/BORON.441148

D. Ağaoğulları, Ö. Balcı, S. Mertdinç, Emre Tekoğlu, M. Öveçoğlu

{"title":"Synthesis of VB2-V3B4-V2B3/VC hybrid powders via powder metallurgy processes","authors":"D. Ağaoğulları, Ö. Balcı, S. Mertdinç, Emre Tekoğlu, M. Öveçoğlu","doi":"10.30728/BORON.441148","DOIUrl":"https://doi.org/10.30728/BORON.441148","url":null,"abstract":"The present study reports the in-situ synthesis of hybrid powders containing vanadium borides (VB 2 , V 3 B 4 and V 2 B 3 ) and vanadium carbide (VC) using powder metallurgy methods. VB 2 -V 3 B 4 -V 2 B 3 /VC hybrid powders were synthesized from V 2 O 5 , B 2 O 3 and C powder blends via a carbothermal reduction route assisted by mechanical milling. Powder blends were mechanically milled up to 5 h in a high-energy ball mill. The milling process reduced the crystallite size, increased the uniformity of the particle distribution and hence increased the reactivity of the starting powders. As-blended and milled powders were annealed at different temperatures (1400, 1500 and 1600°C) for 12 h to investigate the probability of achieving vanadium boride and carbide phases simultaneously. Annealed powders were characterized using X-ray diffractometer (XRD), scanning electron microscope/energy dispersive spectrometer (SEM/EDS) and particle size analyzer. In case of using annealing temperature of 1400°C, VB 2 -V 3 B 4 -V 2 B 3 /VC hybrid powders were obtained with an amount of unreacted V 2 O 5 . Annealing temperatures of 1500 and 1600 ° C resulted in the formation of VB 2 , V 3 B 4 , V 2 B 3 and VC phases. Milling affected the weight percentages of the phases as well as the type of major boride phase.","PeriodicalId":431027,"journal":{"name":"Journal of Boron","volume":"109 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115162697","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

Electromagnetic launching technology and boron at Moon for Space 电磁发射技术和硼在月球的空间

Journal of Boron Pub Date : 2018-11-26 DOI: 10.30728/BORON.423381

Erk Inger

引用次数: 0

Potential for using borate mixtures as groundline preservative pastes 使用硼酸盐混合物作为底线防腐膏的潜力

Journal of Boron Pub Date : 2018-07-05 DOI: 10.30728/BORON.328592

S. Uysal, Jed Cappellazzi, J. Morrell

引用次数: 1