Preparation of α-Al2O3 Powder by Microwave Pyrolysis

2014 ◽  
Vol 602-603 ◽  
pp. 88-92 ◽  
Author(s):  
Hao Chen ◽  
Bing Bing Fan ◽  
Xin Zhang ◽  
Xiao Xuan Pian ◽  
Rui Zhang
Keyword(s):  
Aluminum Hydroxide ◽  
High Purity ◽  
Raw Materials ◽  
Xrd Analysis ◽  
Fast Method ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Microwave Pyrolysis ◽  
X Ray ◽  
Thermal Analyzer

A fast method of microwave pyrolysis was provided to prepare α-Al2O3 powders. Aluminum hydroxide and Aluminum ammonium sulfate doclecahydrate were used as raw materials to obtain α-aluminum oxide powder by microwave pyrolysis, respectively. Thermo-Gravimetric/Differential Thermal Analyzer (TG/DTA) and X-ray Diffraction (XRD) analysis were employed to investigate pyrolysis process and the transformation of metastables Al2O3 in the process of heating different precursors. Meanwhile, Flied Emission Scanning Electron Microscopy (FESEM) was applied to observe microstructure and grain growth, and the phase composition was characterized by XRD. The results indicated that the high purity α-Al2O3 was obtained which met the demands of market, and the sample obtained from aluminum hydroxide performed high purity, small particle size and, while the sample from ammonium aluminum sulfate showed lower purity and larger grain size.

Preparation and Microstructure of Bauxite Ceramic Microsphere

2007 ◽  
Vol 336-338 ◽  
pp. 1124-1126
Author(s):  
Xiao Su Cheng ◽  
Ling Ke Zeng ◽  
Xiu Yan Li ◽  
Wen Yan Sheng ◽  
An Ze Shui ◽  
...  
Keyword(s):  
Raw Materials ◽  
Xrd Analysis ◽  
Al2o3 Content ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Main Crystalline Phase ◽  
Ceramic Microsphere ◽  
Α Al2o3 ◽  
Chinese Bauxite

In this paper, microspheres were prepared by using Chinese bauxite as raw materials through centrifugal spray drying method. The microstructure and composition of ceramic microsphere were investigated by X-ray diffraction, scanning electron microscope and X-ray energy spectrum. The particle size was 10~100#m. The XRD analysis reveals that the main crystalline phase of the ceramic microsphere were α-Al2O3 and mullite (3Al2O3•2SiO2). The Al2O3 content (chemical composition) of the microspheres was little more than 70%, and the molar ratio of Al2O3/SiO2 was near to the molar ratio of alumina and silica of mullite.

Reaction Mechanism of LiFePO4/C Cathode Materials Synthesized by Carbothermal Reduction Method

2010 ◽  
Vol 178 ◽  
pp. 248-253 ◽  
Author(s):  
Li Min Gao ◽  
Guang Chuan Liang ◽  
Li Wang ◽  
Xiao Ke Zhi ◽  
Xiao Fei Jie
Keyword(s):  
Carbothermal Reduction ◽  
Reduction Method ◽  
Intermediate Phase ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
X Ray ◽  
Reducing Atmosphere ◽  
Carbothermal Reduction Method ◽  
Lower Temperature

LiFePO4/C powders were synthesized by carbothermal reduction method using Li2CO3 (A.R), FePO4 (A.R) and glucose as raw materials. In this paper, the carbothermal reaction courses were characterized by Thermo-gravimetric (TG)/Differential Thermal Analysis (DTA), X-ray diffraction (XRD) and Fourier transform infrared (FTIR). It was found that the different synthesis temperatures and the different reducing atmosphere in systems could lead to different reactions, resulting in different final products and a direct impact on material performance. At around 350 °C LiFePO4 is directly formed without intermediate phase. In lower temperature of 400-500 °C, the sample included a certain amount of Li3PO4 and Fe2O3 impurity phases. When calcination temperature rose to 550 °C, the sample could be pure LiFePO4 phase.

XRD Analysis of Al-6vol%SnPb Composites Fabricated by Cold Forging Process with Various Sintering Temperatures

2015 ◽  
Vol 1087 ◽  
pp. 420-423
Author(s):  
Marwan Zakaria ◽  
Siti Rodiah Karim ◽  
Nur Azam Badarulzaman
Keyword(s):  
Vickers Hardness ◽  
Constant Pressure ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Xrd Analysis ◽  
Cold Forging ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optimum Result ◽  
Forging Process

This paper focused on fabrication of Al-6vol%SnPb from recycled Aluminium and recycled solder and its characterization in different sintering temperature. Al-20SnPb was fabricated by using cold forging process of flakes chip raw materials. Constant pressure (56.4 MPa) was used to implement cold forging process. Various sintering temperature (200 0C, 250 0C, 300 0C and 3500C) was studied to obtain the optimum hardness properties. The diffraction pattern of X-Ray diffraction (XRD) reveals the influence of varying sintering temperature of Al-6vol%SnPb. Vickers hardness result also support that, optimum result obtained is at sintering temperature 300 °C.

New Advanced SiC Ceramics Based on Natural Biomaterials

2012 ◽  
Vol 729 ◽  
pp. 350-355 ◽  
Author(s):  
László A. Gömze ◽  
Dóra Lipusz ◽  
Ludmila N. Gömze
Keyword(s):  
Silicon Carbide ◽  
High Purity ◽  
Raw Materials ◽  
Xrd Analysis ◽  
Ceramic Composites ◽  
Low Density ◽  
High Porosity ◽  
X Ray Diffraction ◽  
Trade Name ◽  
Sic Ceramic

On the basis of several years experiments in investigation of hetero-modulus material structures and using natural biomaterials and high purity quartz powders the authors successfully developed new high porosity low density SiC ceramic cellulars and foams. For the development of new silicon-carbide and carbon-silicon-carbide (C/SiC) cellular ceramic composites and foams the author used high purity SiO2 powders mined in Fehervarcsurgo (Hungary) and a biomaterial reagents made from renewable vegetable under trade-name IG-R1. These low density high porosity silicon-carbides probably can be successfully applied in development of light weight ceramic reinforced metal alloy composites in the future. The structure and X-ray diffraction (XRD) analysis of used raw materials and the achieved by authors new SiC and C/SiC ceramic composites and foams are described and shown in present work.

scholarly journals Analisis Mineralogi dan Kimia Dolomit Kabupaten Bone Bolango, Provinsi Gorontalo

2021 ◽  
Vol 9 (2) ◽  
pp. 95-102
Author(s):  
Sufriadin Sufriadin ◽  
Purwanto Purwanto ◽  
Muhammad Rahmatul Jihad ◽  
Astina Aras ◽  
Angelia Santoso ◽  
...  
Keyword(s):  
Raw Materials ◽  
Xrd Analysis ◽  
Chemical Compositions ◽  
Content Increase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Agriculture Sector ◽  
Selective Mining ◽  
Fluorescence Spectrometer

Characterization of dolomite samples from Bone Bolango, Gorontalo Province have been performed with the objective to find out their mineralogical and chemical compositions. Observation and mineral analyses were carried out by means of microscopy and X-ray diffraction methods respectively; whereas chemical composition was determined by using X-ray fluorescence spectrometer. Result of XRD analysis shows that samples contain dolomite [CaMg(CO3)2], calcite [CaCO3] and [SiO2]. The proportion of dolomite is about 60.4% in average and its presence is as replacement of calcite in bioclast components and matrices in the rock. Dolomite crystals are characterized by mosaic texture with euhedral – subhedral in shapes. Spacially, dolomite content increase from west to the east of study area. The XRF analysis reveals that dolomite samples contain MgO ranging between 8.07 and 20.78% while CaO ranges between 30.04 and 56.13%. The SiO2 concentration ranges from 3.50 – 7.55%; whereas Al2O3 ranges from 1.07 – 1.84%. The average MgO content of dolomite about 12.89% can be categorized as calcium dolomite. Dolomite within the study area can be used directly in agriculture sector, but it less suitable as raw materials in glass, ceramic and refractory industries because the average content of MgO is less than 17%. However, it can be increased of their MgO with the application of selective mining or beneficiation process.

scholarly journals Thermal behavior of Zefreh dolomite mine (Central Iran)

2009 ◽  
Vol 45 (1) ◽  
pp. 35-44 ◽  
Author(s):  
B.K. Shahraki ◽  
B. Mehrabi ◽  
R. Dabiri
Keyword(s):  
Thermal Behavior ◽  
Raw Materials ◽  
Atmospheric Condition ◽  
Xrd Analysis ◽  
Heating Time ◽  
X Ray Diffraction ◽  
Quartz Content ◽  
X Ray ◽  
Structure Changes ◽  
Xrd Techniques

Dolomite has a large amounts of MgO and is an important raw materials for steel, iron and refractory industries. In this paper thermal behavior of Zefreh dolomite at various temperatures was studied by differential thermal analysis (DTA), Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT - IR) and powder X-ray diffraction (XRD) techniques. The DTA curve shows two endothermic peaks at 772 and 834?C. The first peak is associated with the formation of magnesia (MgO), calcite(CaCO3) and CO2. The second peak represents the decomposition of calcite with formation of CaO and further CO2 release. At 772?C quantitative XRD analysis in atmospheric condition shows small amounts of CaO (less than 2%) which form simultaneously or later than calcite. TGA curve shows total weight loss for decomposition of dolomite is 46.2%. By increasing heating time of samples in furnace, dolomite decomposes in lower temperatures. X-ray diffraction analysis of heat treated samples up to 750?C indicates that dolomite structure changes into calcite. The increases in quartz content accelerated the mechanochemical deformation and amorphization of dolomite phase. At high temperature ( more than 1000?C) Ca3Mg(SiO4)2 and CaSiO4 were formed. XRD and FTIR confirm dolomite decomposition reactions.

XRD AND XRF ANALYSIS OF THE ANCIENT BRICKS FROM CANDI KAMPUNG BARU, KEDAH

2018 ◽  
Vol 16 ◽  
Author(s):  
Zuliskandar Ramli ◽  
Muhammad Nu'man Mohd Nasir ◽  
Abdul Latif Samian ◽  
Nor Zalina Harun ◽  
Mohd Shamsul Bahari Abdul Hadi ◽  
...  
Keyword(s):  
Raw Materials ◽  
Construction Material ◽  
Xrd Analysis ◽  
Major And Trace Elements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrf Analysis ◽  
The North ◽  
The Many ◽  
The Temple

XRD and XRF analysis on the ancient bricks were conducted to identify whether the raw materials to produce the bricks originate from the site. Candi Kampung Baru is recorded as one of the temple that used bricks as the main construction material. This site is suggested to be built between the 8th to 10th centuries AD based on the size of the bricks and imported ceramics associated with the structure. The position of this candi that is facing to the north is a major indication that the candi in Kampung Baru Site is one of the many Buddhist candis that have been found in Bujang Valley. This study used X-Ray Fluorescence (XRF) and X-Ray Diffraction (XRD) analysis techniques to identify the composition of the major and trace elements and minerals found in the bricks. The results of the analysis on the ancient brick of Candi Kampung Baru revealed that the mineral content contained in the brick samples consists of quartz, muscovite, microcline and sanidine. Minerals found suggest that open burning technique was used during the brick making process with the local raw clay sources were used to produce the bricks. The results therefore implied that the participation of the local communities in Old Kedah Kingdom contributed to the prosperity of this region.

Synthesis, Characterization and Photocatalytic Properties of Lithium Titanate Nanorods

2015 ◽  
Vol 14 (05n06) ◽  
pp. 1550020 ◽  
Author(s):  
L. Z. Pei ◽  
H. D Liu ◽  
N. Lin ◽  
H. Y. Yu
Keyword(s):  
Diffuse Reflectance ◽  
Raw Materials ◽  
Diffuse Reflectance Spectrum ◽  
Hydrothermal Process ◽  
Xrd Analysis ◽  
Lithium Titanate ◽  
X Ray Diffraction ◽  
Titanium Butoxide ◽  
X Ray ◽  
Crystalline Growth

Lithium titanate nanorods have been synthesized via the hydrothermal process using lithium acetate, titanium butoxide and ethylenediamine as raw materials. X-ray diffraction (XRD) analysis shows that lithium titanate nanorods are composed of orthorhombic Li 2 Ti 3 O 7 phase. Scanning electron microscopy (SEM) shows that the diameter and the length of lithium titanate nanorods are about 40–150 nm and 1 μm, respectively. UV-Vis diffuse reflectance spectrum indicates that the bandgap of the lithium titanate nanorods is 3.63 eV. Ethylenediamine plays an essential role in the formation of lithium titanate nanorods. Ethylenediamine-assisted nucleation and crystalline growth process have been proposed to explain the formation and growth of lithium titanate nanorods. Photocatalytic degradation of methylene blue (MB) dye over the lithium titanate nanorods has been investigated under UV-Vis light irradiation. MB solution with the initial concentration of 2.5 mgL-1 can be degraded totally using 10 mg lithium titanate nanorods in 10 mL MB solution.

Effect of Aluminum Source on the Structural and Thermal Properties of Partially Phosphorylated Polyvinyl Alcohol Composite (PPVA) - Aluminum Phosphate (PPVA-AlPO4) Nanocomposite

2016 ◽  
Vol 701 ◽  
pp. 291-294 ◽  
Author(s):  
Asmalina Mohamed Saat ◽  
Mohd Rafie Johan
Keyword(s):  
Thermal Properties ◽  
Polyvinyl Alcohol ◽  
Aluminum Hydroxide ◽  
Vinyl Alcohol ◽  
Aluminum Phosphate ◽  
Xrd Analysis ◽  
Aluminum Nitrate ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
X Ray

Partially phosphorylated poly vinyl alcohol (PPVA) was mixed with two different aluminum (Al) sources (aluminum nitrate and aluminum hydroxide) to produce a PPVA-AlPO4 composite. Transgravimetric analysis (TGA) shows that the weight residue of PPVA-AlPO4 composite using aluminum nitrate is higher than aluminum hydroxide. X-Ray diffraction (XRD) analysis shows the occurrence of multiple phases of PPVA-AlPO4 composite using aluminum nitrate and three broad peaks at range of 2-6, 6-18 and 24-36 ̊ using aluminum hydroxide.

scholarly journals XRD AND XRF ANALYSIS OF THE ANCIENT BRICKS FROM CANDI KAMPUNG BARU, KEDAH

2018 ◽  
Vol 16 (5) ◽  
Author(s):  
Zuliskandar Ramli ◽  
Muhammad Nu'man Mohd Nasir ◽  
Abdul Latif Samian ◽  
Nor Zalina Harun ◽  
Mohd Shamsul Bahari Abdul Hadi ◽  
...  
Keyword(s):  
Raw Materials ◽  
Construction Material ◽  
Xrd Analysis ◽  
Major And Trace Elements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrf Analysis ◽  
The North ◽  
The Many ◽  
The Temple

XRD and XRF analysis on the ancient bricks were conducted to identify whether the raw materials to produce the bricks originate from the site. Candi Kampung Baru is recorded as one of the temple that used bricks as the main construction material. This site is suggested to be built between the 8th to 10th centuries AD based on the size of the bricks and imported ceramics associated with the structure. The position of this candi that is facing to the north is a major indication that the candi in Kampung Baru Site is one of the many Buddhist candis that have been found in Bujang Valley. This study used X-Ray Fluorescence (XRF) and X-Ray Diffraction (XRD) analysis techniques to identify the composition of the major and trace elements and minerals found in the bricks. The results of the analysis on the ancient brick of Candi Kampung Baru revealed that the mineral content contained in the brick samples consists of quartz, muscovite, microcline and sanidine. Minerals found suggest that open burning technique was used during the brick making process with the local raw clay sources were used to produce the bricks. The results therefore implied that the participation of the local communities in Old Kedah Kingdom contributed to the prosperity of this region.

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