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Exploration of High‐Hardness/Low‐Melting Borate Glasses
Author(s) -
Segawa Hiroyo,
Igarashi Tatsuhiro,
Sakamoto Tomoyuki,
Mizuno Kento,
Konishi Tomoya,
Inoue Satoru
Publication year - 2010
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/j.2041-1294.2010.00034.x
Subject(s) - materials science , boron , glass transition , non blocking i/o , melting temperature , indentation hardness , borate glass , crystallography , analytical chemistry (journal) , mineralogy , metallurgy , microstructure , composite material , doping , chemistry , polymer , biochemistry , catalysis , optoelectronics , organic chemistry , chromatography
Numerous types of borate glass—AEO–ZnO–B 2 O 3 (AEO=CaO, SrO, BaO), TMO–ZnO–B 2 O 3 (TMO=MnO, Fe 2 O 3 , Co 3 O 4 , NiO, CuO), and REO–TMO–B 2 O 3 (REO=Nd 2 O 3 and La 2 O 3 )—were investigated to discover a glass with high hardness and low melting temperature. They were prepared using a combinatorial glass melting system, and their hardness and glass transition temperature, T g , were measured. The REO–TMO–B 2 O 3 glass systems had higher hardness than the other glass systems due to the large packing density of the glasses. In particular, the hardness values of the REO–NiO–B 2 O 3 glasses were >8 GPa, with T g values of about 650°C. The REO–NiO–B 2 O 3 glasses are good candidates for high‐hardness and low‐melting‐temperature glasses. Among glasses having a T g <550°C, Fe 2 O 3 –ZnO–B 2 O 3 , Co 3 O 4 –ZnO–B 2 O 3 , and REO–MnO–B 2 O 3 glasses had hardnesses >6 GPa.