Kinetics of Precipitation of alpha-Al2O3 in Polycrystalline Supersaturated MgO - 2Al2O3 Spinel Solid Solution

1986 ◽  
Vol 69 (5) ◽  
pp. 365-373 ◽  
Author(s):  
P. C. PANDA ◽  
R. RAJ
Keyword(s):  
Solid Solution ◽  
Spinel Solid Solution ◽  
Kinetics Of Precipitation ◽  
Kinetics Of

scholarly journals Oxidation behavior of non-stoichiometric (Zr,Hf,Ti)Cx carbide solid solution powders in air

2021 ◽  
Author(s):  
Huilin Lun ◽  
Yi Zeng ◽  
Xiang Xiong ◽  
Ziming Ye ◽  
Zhongwei Zhang ◽  
...  
Keyword(s):  
Solid Solution ◽  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Group Iv ◽  
Hypersonic Vehicles ◽  
Metal Carbides ◽  
Initial Oxidation ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Kinetics Of

AbstractMulti-component solid solutions with non-stoichiometric compositions are characteristics of ultra-high temperature carbides as promising materials for hypersonic vehicles. However, for group IV transition-metal carbides, the oxidation behavior of multi-component non-stoichiometric (Zr,Hf,Ti)Cx carbide solid solution has not been clarified yet. The present work fabricated four kinds of (Zr,Hf,Ti)Cx carbide solid solution powders by free-pressureless spark plasma sintering to investigate the oxidation behavior of (Zr,Hf,Ti)Cx in air. The effects of metallic atom composition on oxidation resistance were examined. The results indicate that the oxidation kinetics of (Zr,Hf,Ti)Cx are composition dependent. A high Hf content in (Zr,Hf,Ti)Cx was beneficial to form an amorphous Zr-Hf-Ti-C-O oxycarbide layer as an oxygen barrier to enhance the initial oxidation resistance. Meanwhile, an equiatomic ratio of metallic atoms reduced the growth rate of (Zr,Hf,Ti)O2 oxide, increasing its phase stability at high temperatures, which improved the oxidation activation energy of (Zr, Hf, Ti)Cx.

Kinetics of Precipitation.

1965 ◽  
Vol 87 (6) ◽  
pp. 1414-1414
Author(s):  
Silvester Liotta
Keyword(s):  
Kinetics Of Precipitation ◽  
Kinetics Of

Kinetics of Precipitation in a Complex Hot-work Tool Steel

2010 ◽  
Vol 81 (1) ◽  
pp. 64-73 ◽  
Author(s):  
B. Sonderegger ◽  
E. Kozeschnik ◽  
H. Leitner ◽  
H. Clemens ◽  
J. Svoboda ◽  
...  
Keyword(s):  
Tool Steel ◽  
Hot Work Tool Steel ◽  
Kinetics Of Precipitation ◽  
Kinetics Of

Controlling disorder in host lattice by hetero-valence ion doping to manipulate luminescence in spinel solid solution phosphors

2018 ◽  
Vol 61 (12) ◽  
pp. 1624-1629 ◽  
Author(s):  
Qinqin Ma ◽  
Jie Wang ◽  
Wei Zheng ◽  
Qian Wang ◽  
Zhiheng Li ◽  
...  
Keyword(s):  
Solid Solution ◽  
Host Lattice ◽  
Spinel Solid Solution ◽  
Ion Doping

Performance Studies on In Situ Spinel Solid Solution Bonded Periclase Refractories

2014 ◽  
Vol 633 ◽  
pp. 245-248
Author(s):  
Xin Lin ◽  
Yong Li ◽  
Yan Jing Li ◽  
Jun Jie Zhang ◽  
Chang He Gao ◽  
...  
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Performance Studies ◽  
Magnesium Aluminate ◽  
Spinel Solid Solution ◽  
Magnesium Aluminate Spinel ◽  
Crushing Strength ◽  
Cold Crushing Strength ◽  
Shock Resistance

Specimens were prepared using iron-rich magnesia (3~1 mm、≤1 mm) and high purity magnesia (≤0.088 mm) as the main starting materials, adding tabular alumina at different size (3~2、2~1、≤1 mm) and content:3%、6%、9%、12%、15% to discover the influence of tabular alumina on sample performance. Phase composition and microstructure were also analyzed. The results show that specimen with content of 6% of corundum possessed the best comprehensive performance:apparent porosity 17%, bulk density 2.95 g·cm-3, cold crushing strength 74 MPa, refractoriness under load 1700 °C, heat shock resistance of up to 18 times. The formations of magnesium aluminate spinel and hercynite solid solution were enhanced by Fe ion at high temperatures in the iron-rich magnesia-corundum system at the presence of iron oxides, which are able to largely dissolved in periclase.

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