Study of Hydroxyapatite/Al2O3 (anodic) Biocomposite Coating on Titanium with a Novel Multi-Step Method

2006 ◽  
Vol 312 ◽  
pp. 257-262
Author(s):  
Li Ping He ◽  
Zhen Jun Wu ◽  
Zong Zhang Chen ◽  
Yiu Wing Mai
Keyword(s):  
Hydrothermal Treatment ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Energy Dispersive Spectrometry ◽  
Constant Current ◽  
X Ray Diffraction ◽  
Step Method ◽  
Constant Current Density ◽  
X Ray ◽  
Scanning Electron

A novel hydroxyapatite/Al2O3 (anodic) biocomposite coating has been successfully fabricated on titanium using a multi-step technique including physical vapor deposition (PVD), anodization, electrodeposition and hydrothermal treatment. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD) were employed to investigate morphologies and compositions of the pre- and post-hydrothermally treated hydroxyapatite/Al2O3 (anodic) biocomposite coatings. The results showed that plate-like Ca-deficient hydroxyapatite coating was directly elctrodeposited onto anodic Al2O3 at a constant current density of 2.0 mA/cm2 using NaH2PO4 as the phosphorous source. The plate-like Ca-deficient hydroxyapatite was converted into network-like Ca-rich hydroxyapatite after hydrothermal treatment.

Effect of Cu Content on the Tribological Performance of Cr-N Coatings at High Temperatures (840°C)

2009 ◽  
Author(s):  
Kyriaki Polychronopoulou ◽  
Claus Rebholz ◽  
Nicholaos G. Demas ◽  
Andreas A. Polycarpou ◽  
P. N. Gibson
Keyword(s):  
Vapor Deposition ◽  
Photoelectron Spectroscopy ◽  
Physical Vapor Deposition ◽  
Tribological Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cu Content ◽  
Glancing Angle ◽  
Scanning Electron ◽  
Ball On Disc

Cr-N and Cu-Cr-N coatings with Cu content between 3–65 at.%, Cu/Cr ratios in the 0.04–4.5 range and 21–27 at.% N, synthesized by twin e-beam Physical Vapor Deposition (EBPVD) at 450°C, were investigated. Using X-ray photoelectron spectroscopy (XPS), glancing angle X-ray diffraction (GAXRD) and scanning electron microscopy (SEM), in combination with nanoindentation mechanical property measurements and laboratory controlled ball-on-disc sliding experiments, it is shown that Cu-Cr-N coatings with low Cu content (3 at.%) possess sufficient wear resistance for high temperature demanding tribological applications.

scholarly journals Analytical study of Buddha sculptures in Jingyin temple of Taiyuan, China

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Xiaojian Bai ◽  
Chen Jia ◽  
Zhigen Chen ◽  
Yuxuan Gong ◽  
Huwei Cheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Analytical Study ◽  
Energy Dispersive Spectrometry ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Ancient China ◽  
X Ray ◽  
Unique Style ◽  
Scanning Electron

AbstractWith exquisite design and unique style, the painted sculptures of Tutang Buddha and two attendants Buddha in Jingyin Temple are precious cultural heritages of China. The sculpture of Tutang Buddha, which was carved from a mound and painted by ancient craftsmen, was rarely found in ancient China. However, due to natural and human factors, the sculptures were severely damaged. Obviously, they require urgent and appropriate protection and restoration. In this study, samples taken from the sculptures were analysed through multiple analytical techniques, including scanning electron microscopy with energy dispersive spectrometry (SEM–EDS), Raman spectroscopy, X-ray diffraction (XRD), optical microscopy (OM) and granulometry. The analysis results enable us to infer the techniques used by the craftsmen in making the sculptures and provide a reliable evidence for the conservation and future protection of these and similar sculptures.

OMCVD of thin films from metal diketonates and triphenylbismuth

1990 ◽  
Vol 5 (6) ◽  
pp. 1169-1175 ◽  
Author(s):  
A. D. Berry ◽  
R. T. Holm ◽  
M. Fatemi ◽  
D. K. Gaskill
Keyword(s):  
Electron Microscopy ◽  
Vapor Deposition ◽  
Atmospheric Pressure ◽  
Electron Spectroscopy ◽  
Auger Electron ◽  
Chemical Vapor ◽  
X Ray Diffraction ◽  
Strontium Barium ◽  
X Ray ◽  
Scanning Electron

Films containing the metals copper, yttrium, calcium, strontium, barium, and bismuth were grown by organometallic chemical vapor deposition (OMCVD). Depositions were carried out at atmospheric pressure in an oxygen-rich environment using metal beta-diketonates and triphenylbismuth. The films were characterized by Auger electron spectroscopy, Nomarski and scanning electron microscopy, and x-ray diffraction. The results show that films containing yttrium consisted of Y2O3 with a small amount of carbidic carbon, those with copper and bismuth were mixtures of oxides with no detectable carbon, and those with calcium, strontium, and barium contained carbonates. Use of a partially fluorinated barium beta-diketonate gave films of BaF2 with small amounts of BaCO3.

scholarly journals The Characteristics of Padamarang Magnesite under Calcination and Hydrothermal Treatment

2019 ◽  
Vol 29 (2) ◽  
Author(s):  
Mutia Dewi Yuniati ◽  
Feronika Cinthya Mawarni Putri Wawuru ◽  
Anggoro Tri Mursito ◽  
Iwan Setiawan ◽  
Lediyantje Lintjewas
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Hydrothermal Treatment ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Magnesite (MgCO3) is the main source for production of magnesium and its compound. In Indonesia, magnesite is quite rare and can be only found in limited amount in Padamarang Island, Southeast Sulawesi Provence. Thus the properties of magnesite and the reactivity degree of the obtained product are of technological importance. The aim of this work was to analyze the characteristics of Padamarang magnesite under calcination and hydrothermal treatment processes. The processes were carried out at various temperatures with range of 150-900°C for 30 minutes. The solids were characterized with respect to their chemical and physical properties by using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). SEM image indicates that magnesite was formed from thin and flat hexagon sheets. The FTIR and XRD analysis disclose that MgO formed at temperature above 300°C, where as the magnesite sample also lost its mass around 50%. These results demonstrate that Padamarang magnesite decomposes to magnesium oxide and carbon dioxide at high temperature.Magnesit (MgCO3) merupakan sumber utama untuk produksi magnesium dan senyawa-senyawanya. Di Indonesia, magnesit cukup jarang dan hanya dapat ditemukan dalam jumlah yang terbatas di Pulau Padamarang, Propinsi Sulawesi Tenggara. Oleh karena itu sifat magnesit dan derajat reaktivitas dari produk-produk magnesit penting untuk diketahui. Penelitian ini bertujuan untuk menganalisis karakteristik magnesit Padamarang dengan perlakuan kalsinasi dan hidrothermal.  Proses dilakukan pada temperatur yang bervariasi dari 150-900°C selama 30 menit. Sifat kimia dan fisika dari magnesit dikarakterisasi dengan menggunakan scanning electron microscopy dengan energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), dan X-ray diffraction (XRD). Gambar dari analisis SEM menunjukkan bahwa magnesit terbentuk dari lembaran-lembaran heksagonal yang tipis dan datar. Hasil analisis dengan FTIR dan XRD menunjukkan bahwa MgO terbentuk pada temperatur diatas 300°C, dimana sampel magnesit juga kehilangan massanya sekitar 50% pada suhu tersebut. Hal ini menunjukkan bahwa Magnesit Padamarang terdekomposisi menjadi magnesium oksida dan karbon dioksida pada temperatur tinggi.

PHOTOLUMINESCENCE OF NON-CRYSTALLINE ALUMINA NANOWIRES SYNTHESIZED BY DIRECT ANODIZATION OF ALUMINUM

2009 ◽  
Vol 23 (14) ◽  
pp. 1819-1825
Author(s):  
JAYA SARKAR ◽  
GOBINDA GOPAL KHAN ◽  
A. BASUMALLICK
Keyword(s):  
Light Emission ◽  
Pure Aluminum ◽  
Bath Temperature ◽  
Constant Current ◽  
X Ray Diffraction ◽  
Constant Current Density ◽  
X Ray ◽  
Anodization Process ◽  
Potential Applications ◽  
Crystalline Alumina

Alumina nanowires have been synthesized by a simple electrochemical route, by tailoring the anodization process of aluminum. Two-stage anodization of pure aluminum foils were carried out in 0.3 M oxalic acid electrolyte by maintaining a constant current density of 250 A/m2 and suitably controlling the other anodization parameters: anodization voltage, bath temperature and anodization time. The fabricated alumina nanowires were investigated by field-emission scanning electron microscope (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). Moreover, the X-ray diffraction (XRD) study on the prepared nanowires shows that they are non-crystalline in nature. The photoluminescence (PL) spectra of alumina nanowires exhibit two stable emission bands at 438 and 581 nm. The blue luminescence behavior of the alumina nanowires are attributed to the oxygen-deficient defect centers. PL study of alumina nanowires shows that they have potential applications in light emission devices.

Fabrication of Sandwich-Like Hydroxyapatite-Al2O3-Si(100) Biocomposite

2011 ◽  
Vol 287-290 ◽  
pp. 2015-2022
Author(s):  
Zhen Jun Wu ◽  
Jian Min Yuan ◽  
Wen Sheng Li
Keyword(s):  
Physical Vapor Deposition ◽  
Energy Dispersive Spectrometry ◽  
Annealing Temperature ◽  
Pore Diameter ◽  
Atomic Ratio ◽  
Hybrid Technique ◽  
Aluminum Layer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pore Widening

A novel composite biocoating of hydroxyapatite(HA)/Al2O3has been successfully prepared on Si(100) substrate by a hybrid technique of physical vapor deposition (PVD), anodization, and electrodeposition. The fabricated composite biocoating was also annealed under temperatures ranging from 573 to 973 K. Scanning electron microscope (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD) were employed to investigate morphologies and compositions of the HA/Al2O3composite biocoating. It is found that Ca-deficient hydroxyapatite (CDHA) coating holding a Ca/P atomic ratio of 1.61 has been directly electrodeposited onto porous anodic Al2O3with 1.5~3 μm pore diameter formed by anodization of PVD-deposited aluminum layer on Si(100) and subsequent pore-widening. The embedding of HA outer coating into porous anodic Al2O3results in a sandwich-like structure in the finally obtained HA/Al2O3composite biocoating on Si(100). XRD results indicate the decomposition of HA into β-TCP at an annealing temperature above 873 K.

scholarly journals The Influence of the Preparation and Stability of Nanofluids for Heat Transfer

2019 ◽  
Vol 25 (4) ◽  
pp. 45-54 ◽  
Author(s):  
Noor Sabih Majeed ◽  
Basma A. Abdulmajeed ◽  
Anwar Khudhur Yaseen
Keyword(s):  
Heat Transfer ◽  
Electron Microscopy ◽  
Base Fluid ◽  
X Ray Diffraction ◽  
Step Method ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
The Stability ◽  
Scanning Electron

Recently the use of nanofluids represents very important materials. They are used in different branches like medicine, engineering, power, heat transfer, etc. The stability of nanofluids is an important factor to improve the performance of nanofluids with good results. In this research two types of nanoparticles, TiO2 (titanium oxide) and γ-Al2O3 (gamma aluminum oxide) were used with base fluid water. Two-step method were used to prepare the nanofluids. One concentration 0.003 vol. %, the nanoparticles were examined. Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and X-ray diffraction (XRD) were used to accomplish these tests. The stability of the two types of nanofluids is measured by zeta potential and UV-vis spectrophotometer. The results showed that γ-Al2O3/water has more stable than TiO2/ water for the same period of time.  

scholarly journals Comprehensive research of the painted statues of Tutang Buddha and two attendants Buddha in Jingyin Temple, Taiyuan, China

2020 ◽  
Author(s):  
Xiaojian Bai ◽  
Chen Jia ◽  
Zhigen Chen ◽  
Yuxuan Gong ◽  
Huwei Cheng ◽  
...  
Keyword(s):  
Energy Dispersive Spectrometry ◽  
Analytical Techniques ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
Ancient China ◽  
X Ray ◽  
Natural Factors ◽  
Unique Style ◽  
Scanning Electron

Abstract The painted statues of Tutang Buddha and two attendants Buddha in Jingyin Temple, with exquisite design and unique style, are precious cultural heritages of China. The statue of Tutang Buddha which was carved from a mound and painted by ancient craftsmen, is rarely found in ancient China. However, on account of the influence of natural factors and artificial harms, the statues were severly damaged. Obviously, it requires urgently carrying out appropriate protection and restoration of the statues. In this study, the samples taken from the statues were analysed by multiple analytical techniques, including scanning electron microscopy with energy dispersive spectrometry (SEM-EDS), Raman spectroscopy, X-ray diffraction (XRD), biological microscopy and particle size analysis. The analysis enabled us to infer the techniques used by the creators in making the statues. This research provides reliable evidence for the conservation and future protection of these and similar statues.

scholarly journals Analytical Study of Buddha Sculptures in Jingyin Temple of Taiyuan, China

2020 ◽  
Author(s):  
Xiaojian Bai ◽  
Chen Jia ◽  
Zhigen Chen ◽  
Yuxuan Gong ◽  
Huwei Cheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Analytical Study ◽  
Energy Dispersive Spectrometry ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Ancient China ◽  
X Ray ◽  
Unique Style ◽  
Scanning Electron

Abstract With exquisite design and unique style, the painted sculptures of Tutang Buddha and two attendants Buddha in Jingyin Temple are precious cultural heritages of China. The sculpture of Tutang Buddha, which was carved from a mound and painted by ancient craftsmen, was rarely found in ancient China. However, due to natural and human factors, the sculptures were severely damaged. Obviously, they require urgent and appropriate protection and restoration. In this study, samples taken from the sculptures were analysed through multiple analytical techniques, including scanning electron microscopy with energy dispersive spectrometry (SEM-EDS), Raman spectroscopy, X-ray diffraction (XRD), optical microscopy (OM) and granulometry. The analysis results enable us to infer the techniques used by the craftsmen in making the sculptures and provide a reliable evidence for the conservation and future protection of these and similar sculptures.

Investigation of the weldability of AISI304 and AISI1030 steels welded by friction welding

2020 ◽  
Vol 117 (6) ◽  
pp. 601
Author(s):  
Tanju Teker ◽  
Eyyüp Murat Karakurt ◽  
Murat Özabaci ◽  
Yaşar Güleryüz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Friction Welding ◽  
Rotational Speed ◽  
Fracture Behavior ◽  
Energy Dispersive Spectrometry ◽  
Weld Strength ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In this study, the effect of rotational speed on the microstructure and weldability of AISI1030 steel and AISI304 stainless steel welded by friction welding method were investigated experimentally. The weld joints were manufactured with rotational speed (1500, 1600, 1700, 1800, 1900, and 2000 rev/min.), friction pressure (40 MPa), forging pressure (60 MPa), forging time (4 s), and friction time (6 s). After the FW process, the microstructures of the weld interfaces were analyzed by optic microscopy, scanning electron microscopy, energy dispersive spectrometry, elemental mapping, and X-ray diffraction analysis. Moreover, the weld strength was analyzed by tensile test, and the fracture behavior was investigated with scanning electron microscopy. The results indicated that increased rotational speed had a significant effect on the microstructure and weldability.

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