Part Ι: Effects of two-stage heat treatment on densification, microstructural features and dielectric properties of CaO–MgO–SiO 2 glass-ceramics with ZrO 2 nucleating agents

2017 ◽  
Vol 96 ◽  
pp. 66-70 ◽  
Author(s):  
Chen Chia Chou ◽  
Kuei Chih Feng ◽  
Igor P. Raevski ◽  
Haydn Chen ◽  
Chung-Ya Tsao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Dielectric Properties ◽  
Glass Ceramics ◽  
Nucleating Agents ◽  
Two Stage ◽  
Stage Heat Treatment

Crystallization and dielectric properties of SrO–BaO–Nb2O5–GeO2 tungsten–bronze glass–ceramics

2001 ◽  
Vol 16 (7) ◽  
pp. 2057-2063 ◽  
Author(s):  
Jiin-Jyh Shyu ◽  
Hsin-Wei Peng
Keyword(s):  
Heat Treatment ◽  
Dielectric Properties ◽  
Tungsten Bronze ◽  
Glass Ceramics ◽  
Dielectric Behavior ◽  
Dendritic Morphology ◽  
Dielectric Constants ◽  
Two Stage ◽  
Tetragonal Tungsten Bronze ◽  
Stage Heat Treatment

The crystallization and dielectric properties of SrO–BaO–Nb2O5–GeO2 glass–ceramics were investigated. One- and two-stage heat-treatment methods were used to convert the parent glass to glass–ceramics. Strontium barium niobate (SBN) with a tetragonal tungsten-bronze structure formed as the major crystalline phase. When the crystallizing temperature/time was increased, the secondary crystalline BaGe2O5 phase coexisted with SBN. BaGe2O5 formed as a surface layer grown from the surface into the interior of the sample. The dendritic morphology of SBN crystals was examined. The glass–ceramics crystallized by two-stage heat treatment have higher dielectric constants than those crystallized by one-stage heat treatment. The highest dielectric constant that was obtained in the present glass–ceramics was 320. The glass–ceramics showed relaxor-type dielectric behavior.

Preparation of mesocarbon microbeads from a synthetic Isotropic pitch through two stage heat treatment in the presence of carbon black

Carbon ◽  
1998 ◽  
Vol 36 (7-8) ◽  
pp. 1231-1233 ◽  
Author(s):  
Y.-G. Wang ◽  
Y.-C. Chang ◽  
S. Ishida ◽  
Y. Korai ◽  
I. Mochida
Keyword(s):  
Heat Treatment ◽  
Carbon Black ◽  
Two Stage ◽  
Mesocarbon Microbeads ◽  
Isotropic Pitch ◽  
Stage Heat Treatment

Two-Stage Heat Treatment of Steel 30CrMnSi and Its Optimization

2016 ◽  
Vol 58 (5-6) ◽  
pp. 362-368 ◽  
Author(s):  
Rasoul Khayyam Nekouei ◽  
Reza Akhaghi ◽  
Rouhollah Tahmasebi ◽  
Arsalan Ravanbakhsh ◽  
Ali Jafari Moghaddam
Keyword(s):  
Heat Treatment ◽  
Two Stage ◽  
Stage Heat Treatment

Development of Machinable Glass-Ceramic without Nucleating Agents

2015 ◽  
Vol 830-831 ◽  
pp. 436-439
Author(s):  
C. Venkateswaran ◽  
Amarnath Padala ◽  
H. Sreemoolanadhan ◽  
M.R. Ajith ◽  
Mariamma Mathew ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Heat Treatment Condition ◽  
Aluminum Silicate ◽  
Nucleating Agents ◽  
Treatment Conditions ◽  
Magnesium Aluminum Silicate ◽  
Optimum Heat ◽  
Alumino Silicate

Mica containing glass-ceramic is prepared by crystallizing magnesium alumino silicate glass between 600°C and 1100°C without the use of any additives or nucleating agents. Effects of ceramization heat treatment conditions on phase constitution and microstructures are analyzed using XRD and HRSEM respectively. Developed glass-ceramics have been analyzed for its microhardness and machinability. Optimum heat treatment condition for achieving uniformly distributed fluorophlogopite phase essential for machinability, and at the same time, magnesium aluminum silicate phase for increasing the hardness, is presented.

Effects of Two-stage Heat Treatment on Delayed Coke and Study of Their Surface Texture Characteristics

JOM ◽  
2016 ◽  
Vol 69 (12) ◽  
pp. 2460-2466 ◽  
Author(s):  
Ui-Su Im ◽  
Jiyoung Kim ◽  
Seon Ho Lee ◽  
Byung-Rok Lee ◽  
Dong-Hyun Peck ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Surface Texture ◽  
Two Stage ◽  
Texture Characteristics ◽  
Stage Heat Treatment
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