scholarly journals Crystallization heat treatment curves of barium disilicate glass / Curvas de tratamento térmico de cristalização de vidro de dissilicato de bário

2021 ◽  
Vol 7 (8) ◽  
pp. 83467-83482
Author(s):  
Nícolas Lara ◽  
Maria Inês Basso Bernardi
Keyword(s):  
Heat Treatment ◽  
Crystallization Heat

Manufacture of the Glass-Ceramics from the Lead-Zinc Tailings by Sintering

2014 ◽  
Vol 955-959 ◽  
pp. 2818-2823
Author(s):  
Xue Lian Ou ◽  
Yan Ping Guo ◽  
Gao Hui Zhong ◽  
Bao Qing Li ◽  
Ying Chen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Crystalline Phase ◽  
Bending Strength ◽  
Orthogonal Experiment ◽  
Glass Ceramics ◽  
Nucleating Agent ◽  
Weight Losses ◽  
Glass Aggregate ◽  
Lead Zinc ◽  
Crystallization Heat

The glass-ceramics of CaO-Al2O3-SiO2system were prepared by sintering using lead-zinc tailings. Orthogonal experiment was carried out to optimize the ratio of lead-zinc tailings, chemical composition of basic-glass and other chemical materials in the system. Crystallization heat treatment conditions were confirmed by the differential thermal analysis (DTA) curve of glass aggregate. Crystalline phase, crystal morphology and mechanical property of the glass-ceramics samples were studied by means of X-ray diffraction (XRD), scanning electron microscope (SEM), hardness and bending strength test. The results indicated that the optimized ratio of the samples was lead-zinc tailings 25%, quartz 46.63%, calcite 21.05%, Al2O310.19% and nucleating agent TiO21%. The optimized crystallization heat treatment was that basic glass was first heated to 800 °C at 10 °C/min, then 800°C-900 °C at 5 °C/min and held still at 900 °C for 2 h. After that, the basic glass was heated to 1230 °C at 1-1.5 °C/min,held for 1h. At last, the glass-ceramics was obtained after the cooling-down of the system. The main crystalline phase of microcrystal glass-ceramics are diopside. The hardness and bending strength were 9.14 GPa and 213.6 MPa, respectively. The glass-ceramics had excellent chemical durability in acid and alkali solution, with weight losses of 0.17% and 0.68%, respectively.

scholarly journals INFLUENCE OF PURITY ON MICROSTRUCTURE AND STRENGTH CHARACTERISTICS OF REFRIGABLE MICROCOMPOSITES

2020 ◽  
pp. 38-43
Author(s):  
N.A. Azarenkov ◽  
V.Е. Semenenko ◽  
S.V. Lytovchenko ◽  
N.G. Styervoyedov
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
High Temperature ◽  
Dimensional Stability ◽  
Structural Materials ◽  
Strength Characteristics ◽  
Crystallization Heat ◽  
Source Materials

The influence of the purity of the source materials on the structural and dimensional stability of micro-composites obtained in the process of controlled invariant phase transformation is investigated. The influence of high-temperature post-crystallization heat treatment on the processes of cleaning and increasing the technological ductility of structural materials is considered. The possibility of their practical use is discussed.

Pre-crystallization heat treatment and infrared luminescence enhancement in Ni2+-doped transparent glass-ceramics

2019 ◽  
Vol 515 ◽  
pp. 42-49 ◽  
Author(s):  
N.V. Golubev ◽  
E.S. Ignat'eva ◽  
V.M. Mashinsky ◽  
Е.О. Kozlova ◽  
V.N. Sigaev ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Glass Ceramics ◽  
Luminescence Enhancement ◽  
Transparent Glass ◽  
Infrared Luminescence ◽  
Crystallization Heat

Effects of Different Heat Treatment Temperatures on the Properties of Quartz Fibers

2010 ◽  
Vol 105-106 ◽  
pp. 115-118 ◽  
Author(s):  
Qi Hong Wei ◽  
Chong Hai Wang ◽  
Zhi Qiang Cheng ◽  
Ling Li ◽  
Hong Sheng Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Phase Transformation ◽  
Fiber Strength ◽  
Single Fiber ◽  
Significant Phase ◽  
Surface Micromorphology ◽  
Heat Treated ◽  
Different Temperatures ◽  
Crystallization Heat

In this paper, XRD was engaged in studying phase transformation of quartz fibers, SEM was engaged in studying the surface micromorphology of quartz fibers heat treated at different temperatures, and the tensile strength was measured by a single fiber strength electronics instrument. The results indicate that surface infiltration agent have been iliminated after heat treatment at 500°C, and the tensile strength decreaced significantly. The higher the temperature was, the more the tensile strength decreaced. There were no significant phase transformation and no crystallization heat treatmented at 500~800°C. But there were some round and strip bulges, and scap defects on the surface. With temperature increasing,some scab defects and bulges began to flake off, and some new rifts and cracks were formed. This was one of the important factors that decreaced tensile strength markedly.

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