Effects of Additives on the Properties of SiO2-B2O3-Al2O3-Na2O-PbO System Glass Powders

2015 ◽  
Vol 817 ◽  
pp. 582-586 ◽  
Author(s):  
Qing Yang ◽  
Jin Yang Huang ◽  
Jun Tao Zou
Keyword(s):  
Softening Temperature ◽  
Glass Crystallization ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
High Temperature Water ◽  
Crystallization Tendency ◽  
Temperature Water ◽  
Glass Powders

The SiO2-B2O3-Al2O3-Na2O-PbO system glass powders were prepared by the high temperature water quenching and ball milling. The effects of CaO, Li2O and ZnO with content of 1~5 wt.% on the glass-forming ability, softening temperature and crystallization behavior of the SiO2-B2O3-Al2O3-Na2O-PbO system glass powders were investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results showed that the glass crystallization tendency became obvious with the increase of CaO and Li2O content, the melting temperature of the glass decreased with the addition of 1% Li2O, while the effect of CaO with content lower than 2% on the formation of glass was not obvious. The addition of ZnO favored the formation of glass, however, the softening temperature of the glass increased with the increase of ZnO content. The softening temperature of the SiO2-B2O3-Al2O3-Na2O-PbO system glass powder decreased by 42.5°C with the addition of 2%CaO-1%Li2O-1%ZnO.

scholarly journals Characterization of the Interface Between the Bulk Glass Forming Alloy Zr41Ti14Cu12Ni10Be23 with Pure Metals and Ceramics

2000 ◽  
Vol 15 (7) ◽  
pp. 1617-1621 ◽  
Author(s):  
Jan Schroers ◽  
Konrad Samwer ◽  
Frigyes Szuecs ◽  
William L. Johnson
Keyword(s):  
Sessile Drop ◽  
Bulk Glass ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
Processing Times ◽  
Thermal Stability Of

The reaction of the bulk glass forming alloy Zr41Ti14Cu12Ni10Be23 (Vit 1) with W, Ta, Mo, AlN, Al2O3, Si, graphite, and amorphous carbon was investigated. Vit 1 samples were melted and subsequently solidified after different processing times on discs of the different materials. Sessile drop examinations of the macroscopic wetting of Vit 1 on the discs as a function of temperature were carried out in situ with a digital optical camera. The reactions at the interfaces between the Vit 1 sample and the different disc materials were investigated with an electron microprobe. The structure and thermal stability of the processed Vit 1 samples were examined by x-ray diffraction and differential scanning calorimetry. The results are discussed in terms of possible applications for composite materials.

Ti Microalloying Effect on Corrosion Resistance and Thermal Stability of Cu45Zr48Al7 Bulk Metallic Glass

2012 ◽  
Vol 490-495 ◽  
pp. 3868-3873 ◽  
Author(s):  
Xiao Hong Yang ◽  
Xi Peng Nie ◽  
Jian Zhong Jiang
Keyword(s):  
Thermal Stability ◽  
Corrosion Resistance ◽  
Metallic Glasses ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
Ti Addition ◽  
Mould Casting ◽  
Thermal Stability Of

Bulk metallic glasses (BMGs) of Cu45Zr48-xAl7Tix with x= 0, 1.5, and 3 at.% were prepared by copper mould casting. The corrosion resistance of the BMGs with different Ti contents was examined by potentiodynamic polarization tests and weight loss measurements in 1 N NaOH, 1 N H2SO4, 1 N H2SO4 + 0.01 N NaCl and 0.5 N NaCl solutions, respectively. The newly-developed BMGs’ corrosion resistance in Cl-- or both H+ and Cl--ions containing solutions can be greatly enhanced. The influence of Ti addition on glass forming ability (GFA) and thermal stability was investigated by x-ray diffraction and differential scanning calorimetry in detail. The alloy containing 1.5 at.% Ti exhibits the largest GFA, the critical size comes up to 10 mm in diameter.

In Situ X-Ray Diffraction Study of the Oxide Formed on Alloy 600 in Borated and Lithiated High-Temperature Water

CORROSION ◽  
10.5006/1994 ◽  
2016 ◽  
Vol 72 (9) ◽  
pp. 1155-1169
Author(s):  
Masashi Watanabe ◽  
Toshio Yonezawa ◽  
Takahisa Shobu ◽  
Ayumi Shiro ◽  
Tetsuo Shoji
Keyword(s):  
High Temperature ◽  
Diffraction Study ◽  
Alloy 600 ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Temperature Water ◽  
Temperature Water

Structure, Annealing Characteristics and Mechanical Properties of Mg60Cu30-yY10Siy Bulk Amorphous Alloys

2002 ◽  
Vol 754 ◽  
Author(s):  
U. Wolff ◽  
B. Yang ◽  
N. Pryds ◽  
J.A. Wert
Keyword(s):  
Mechanical Properties ◽  
Amorphous Alloys ◽  
Simple Technique ◽  
Partial Substitution ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
Si Content ◽  
Constant Heating

ABSTRACTThe effect of different Si contents on the glass forming ability (GFA) and the amorphous-to-crystalline transformation has been investigated for the Mg-Cu-Y-Si system. Four Mg60Cu30-yY10Siy (y = 1–5 at.%) alloys were prepared using a relatively simple technique of rapid cooling of the melt in a copper mould. Crystallization was induced by heat treatment of the alloys and the samples were then characterized concerning their microstructure and thermal stability by X-ray diffraction (XRD), optical (OM) and scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) at a constant heating rate. Partial substitution of Cu by Si leads to a transition of the as-cast structure at a constant cooling rate from amorphous to crystalline with increasing Si content. Furthermore, the glass transition temperature (Tg) of the Mg-Cu-Y-Si alloy is lower compared to the Mg-Cu-Y system. The mechanical properties of the bulk Mg-Cu-Y-Si alloys have been investigated and found to vary with the Si content.

scholarly journals Crystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxes

2020 ◽  
Vol 56 (2) ◽  
pp. 279-287
Author(s):  
Z. Wang ◽  
Q.-F. Shu ◽  
K.-C. Chou
Keyword(s):  
Sem Analysis ◽  
X Ray Diffraction ◽  
Slag Film ◽  
X Ray ◽  
Glass Forming ◽  
Mold Fluxes ◽  
Transfer Behavior ◽  
Ability Index ◽  
Crystallization Tendency ◽  
Copper Mould

To explore the effects of TiO2 and/or B2O3 on crystallization of the glassy fluoride-free slag film near the copper mould, the crystallization characteristics of glassy fluoride-free mold fluxes with fluoride being substituted by TiO2 and/or B2O3 were investigated using X- ray diffraction (XRD), scanning electron microscope (SEM) and differential thermal analysis (DTA) techniques. The glass forming ability index (Kgl) of the glassy fluoride-free mold fluxes was studied using Hruby?s method. The XRD and SEM analysis show that Ca2Al2SiO7, CaTiO3 and CaSiO3 are the dominant crystals of this fluoride-free mold fluxes system. With the content of TiO2 increasing from 0 to 7%, the crystallization of Ca2Al2SiO7 and CaSiO3 are inhibited and the formation of CaTiO3 is also weak, so crystallization tendency of the glassy fluoride-free mold fluxes weakens. But as TiO2 content reaches 10%, the crystallization tendency strengthens because of the strong crystallization of CaTiO3. An increase of B2O3 inhibits the crystallization of calcium silicate, so it weakens the crystallization tendency of the glassy fluoride-free mold fluxes. The crystallization processes of the studied fluoride-free mold fluxes correspond to the surface crystallization mechanism. This research provides important reference for further investigation on the heat transfer behavior of the TiO2 and B2O3-bearing slag between copper mould and slab to evaluate the feasibility of B2O3 and TiO2- bearing fluoride-free mold fluxes.

Investigation of the Bulk Nd60-xDyxFe30Al10 (x=0, 2, 5) Amorphous Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 3393-3396
Author(s):  
Hui Xu ◽  
Xiao Hua Tan ◽  
Nannan Qi ◽  
Qing Wang ◽  
Yuanda Dong
Keyword(s):  
Saturation Magnetization ◽  
Amorphous Alloys ◽  
Magnetic Behavior ◽  
Glass Forming Ability ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
Intrinsic Coercivity

The glass-forming ability, thermal stability and magnetic properties of the Nd60-xDyxFe30Al10 (x=0, 2, 5) bulk amorphous alloys were investigated by x-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscope (SEM) and the vibrating sample magnetometer (VSM). The results show that the glass forming ability of the Nd60-xDyxFe30Al10 (x=0, 2, 5) alloys decrease with increasing Dy content. The as-cast Nd60-xDyxFe30Al10 (x=0, 2, 5) alloys show hard magnetic behavior at room temperature. With increasing Dy content, the intrinsic coercivity of the alloys increase significantly while the saturation magnetization and remanence of the alloys decrease monotonously. With increasing annealed temperature, the intrinsic coercivity of the Nd55Fe30Al10Dy5 alloy decreased significantly, while the saturation magnetization and remanence decrease monotonously. The Nd55Fe30Al10Dy5 alloy shows soft magnetic behavior after annealed at 773K for 30 min.

Characterization of Glass Forming Alloy Fe43.2Co28.8B19.2Si4.8Nb4 Processed by Spray Forming and Wedge Mold Casting Techniques

2011 ◽  
Vol 691 ◽  
pp. 23-26 ◽  
Author(s):  
C. Triveño Rios ◽  
Conrado R. M. Afonso ◽  
Claudemiro Bolfarini ◽  
Walter José Botta Filho ◽  
Claudio Shyinti Kiminami
Keyword(s):  
Amorphous Structure ◽  
Spray Forming ◽  
Bulk Glass ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
Glassy Alloys ◽  
Mold Casting

Bulk glassy alloys based on the Fe-Co-B-Si-Nb system have already achieved high levels of mechanical strength. The present work investigated the microstructural evolution of Fe43.2Co28.8B19.2Si4.8Nb4 alloy during the spray forming and wedge mold casting processes, with emphasis on the formation of amorphous phase. The microstructure was evaluated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The region outer the spray deposit showed the formation of an amorphous structure with a thickness of ~2.5 mm, while that of the wedge-shaped sample exhibited a thickness of up to ~1.5 mm, suggesting that both processes show a promising potential for the production of bulk glass alloys.

Study on Glass Forming Ability for the Nd60-xCo15+xAl25 Alloys

2012 ◽  
Vol 583 ◽  
pp. 82-85
Author(s):  
Yong Jun Tang ◽  
Hui Xu ◽  
Xiao Hua Tan ◽  
Hua Man ◽  
Qin Bai
Keyword(s):  
Differential Scanning Calorimetry ◽  
Amorphous Alloys ◽  
Glass Forming Ability ◽  
Copper Mold ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
Arc Melting ◽  
Dsc Curves

Bulk Nd60-xCo15+xAl25 (where x =0, 2, 5, 8, 11) sheet alloys were prepared by argon arc melting and suction casting a copper mold. Glassing forming ability (GFA) of these alloys was investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Due to the dissimilarity reflected from DSC curves the thermodynamic calculation was applied. The values of Gibbs free energy (∆Gl-x (Tg)) for the amorphous alloys were gave out and some GFA criterions were adopted to make a comparison among the samples.

CRYSTALLIZATION BEHAVIOR OF AMORPHOUS TI-NI-CU ALLOY RIBBONS

2008 ◽  
Vol 01 (02) ◽  
pp. 145-149 ◽  
Author(s):  
JUNG MIN NAM ◽  
YONG HEE LEE ◽  
TAE HYUN NAM ◽  
YEON WOOK KIM ◽  
JUNG MOO LEE
Keyword(s):  
Melt Spinning ◽  
Crystallization Behavior ◽  
Glass Forming Ability ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Cu Content ◽  
Glass Forming ◽  
Cu Alloy ◽  
Transmission Electron

Amorphous Ti 50 Ni (50-x) Cu x (at.%) (x = 15, 20 and 25) alloy ribbons were prepared by melt spinning, and then their crystallization behavior was investigated by optical microscopy, transmission electron microscopy, X-ray diffraction and differential scanning calorimetry. Wavenumber (Qp) decreased from 29.40 nm-1 to 29.29 nm-1 and ΔT(T g - T x ) increased from 31 K to 36 K with increasing Cu content from 15 at.% to 25 at.%, suggesting that glass forming ability of Ti – Ni – Cu alloy ribbons increased with increasing Cu content. Activation energy for crystallization decreased from 211.5 kJ/mol to 136.4 kJ/mol with increasing Cu content from 15 at.% to 25 at.%, suggesting that a stability of Ti – Ni – Cu amorphous decreased with increasing Cu content.

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