scholarly journals Controlling the Phase Content of Li2O-Al2O3-SiO2-B2O3-BaO Glass-Ceramic Bonds with CTE Close to cBN

2020 ◽  
Author(s):  
Zichen Guo ◽  
Feng He ◽  
Zuhao Li ◽  
Dongyang Yan ◽  
Junlin Xie
Keyword(s):  
Heat Treatment ◽  
Glass Ceramic ◽  
Crystallization Temperature ◽  
Glass Ceramics ◽  
Treatment Method ◽  
Phase Content ◽  
Sintering Process ◽  
Step Heat Treatment ◽  
Heat Treatment Method ◽  
Vitrified Cbn

Abstract Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic bonds with CTE close to cBN for vitrified cBN composites was prepared via a two-step heat treatment method. The crystalline phases were identified by XRD and the phase content was analyzed by WPF refinement. The increasing crystallization temperature would promote the precipitation of more LiAlSi3O8 phase in the glass-ceramic, which was conducive to the preparation of low CTE glass-ceramics. Besides, a crystallization temperature below 625 °C was necessary for the preparation of Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic with CTE close to cBN (3.50 × 10− 6 °C− 1), proving that the two-step heat treatment was an effective sintering process to the preparation of low CTE glass-ceramic bonds for vitrified cBN composites.

Preparation of aluminum nitride granules by a two-step heat treatment method

2018 ◽  
Vol 29 (4) ◽  
pp. 849-854 ◽  
Author(s):  
Kuan-Ting Lai ◽  
Cheng-Hung Shih ◽  
Chun-Te Wu ◽  
Min-Yu Yang ◽  
Chi-Shiung Hsi
Keyword(s):  
Heat Treatment ◽  
Aluminum Nitride ◽  
Treatment Method ◽  
Step Heat Treatment ◽  
Heat Treatment Method

Li2O-Al2O3-SiO2 Glass-Ceramics Used As Anodic Bonding Materials

2008 ◽  
Vol 368-372 ◽  
pp. 1436-1438 ◽  
Author(s):  
Hong Li ◽  
Yun Du ◽  
Jin Shu Cheng ◽  
Tian He Wang
Keyword(s):  
Heat Treatment ◽  
Thermal Expansion ◽  
Coefficient Of Thermal Expansion ◽  
Glass Ceramics ◽  
Treatment Method ◽  
Substrate Material ◽  
Anodic Bonding ◽  
Treatment Schedule ◽  
Crystal Phases ◽  
Step Heat Treatment

The glass-ceramics, whose coefficient of thermal expansion approximately matched to that of silicon, were studied to replace conventional heat-resistant glass as substrate material for anodic bonding. The basic glasses of the Li2O-Al2O3-SiO2 system with TiO2 and ZrO2 as nucleation agents were prepared by melting technology, and the temperatures of nucleation and crystallization were determined. The glass-ceramics were obtained by two-step heat-treatment method. The oriented crystallization of glasses in gradient temperature field was studied. The crystal phases and microstructures of glass- ceramics were analyzed. Effect of heat-treatment schedule on the coefficient of thermal expansion was discussed. The results showed that the most of the main crystal phases of the samples were β-spodumene. The coefficient of thermal expansion of sample was about 32.5×10-7/°C, which was approach to that of silicon.

AlMgB14–TiB2 synthesized by a two-step heat-treatment method

2014 ◽  
Vol 587 ◽  
pp. 790-793 ◽  
Author(s):  
C.S. Li ◽  
F. Yang ◽  
G. Yan ◽  
X.M. Xiong ◽  
G.Q. Liu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Method ◽  
Step Heat Treatment ◽  
Heat Treatment Method

Modified-edge-support heat treatment method of polyimide for crystalline, large-area, and self-standing ultrathin graphite films

Carbon ◽  
2021 ◽  
Author(s):  
Kensuke Murashima ◽  
Yuki Kawashima ◽  
Shuhei Ozaki ◽  
Atsushi Tatami ◽  
Masamitsu Tachibana ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Method ◽  
Large Area ◽  
Heat Treatment Method

A Study of the Influence of Local Heat Treatment on the Structure of Welded Titanium Pipelines

2021 ◽  
Vol 410 ◽  
pp. 37-41
Author(s):  
Natalia A. Astafeva ◽  
Andrey A. Balanovskiy ◽  
Anna A. Pershina
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
Titanium Alloys ◽  
Welded Joints ◽  
Treatment Method ◽  
Local Heat ◽  
Optical Metallography ◽  
Heat Treated ◽  
Weld Structure ◽  
Heat Treatment Method

The article analyzes the results of a study of the influence of zonal heat treatment on the structure of welded joints of pipeline elements made of titanium alloys Ti-3.5Al-1.5Mn. In the manufacture of such structures, the TIG welding method is used to join pipe elements, after which the heat treatment method can be used to relieve residual stresses. The experiments have confirmed the effectiveness of zonal heat treatment preceded by welding. It was revealed that for welded joints made of titanium alloys, heat treatment can stabilize the structure. In experiments conducted by the method of optical metallography, the structure of heat treated and untreated welded joints was investigated. The influence of heat treatment on the weld structure and heat-affected zone was identified.

scholarly journals Bone bonding ability of some borate bio-glasses and their corresponding glass-ceramic derivatives

2012 ◽  
Vol 6 (4) ◽  
pp. 183-192 ◽  
Author(s):  
Fatma Margha ◽  
Amr Abdelghany
Keyword(s):  
Heat Treatment ◽  
Fourier Transform ◽  
Glass Ceramic ◽  
Glass Composition ◽  
Glass Ceramics ◽  
Soda Lime ◽  
Phosphate Solution ◽  
Borate Glasses ◽  
X Ray Diffraction ◽  
X Ray

Ternary borate glasses from the system Na2O?CaO?B2O3 together with soda-lime-borate samples containing 5 wt.% of MgO, Al2O3, SiO2 or P2O5 were prepared. The obtained glasses were converted to their glass-ceramic derivatives by controlled heat treatment. X-ray diffraction was employed to investigate the separated crys?talline phases in glass-ceramics after heat treatment of the glassy samples. The glasses and corresponding glass-ceramics after immersion in water or diluted phosphate solution for extended times were characterized by the grain method (adopted by several authors and recommended by ASTM) and Fourier-transform infrared spectra to justify the formation of hydroxyapatite as an indication of the bone bonding ability. The influence of glass composition on bioactivity potential was discussed too.

Sign in / Sign up

Export Citation Format

Share Document