“…However, the specimen with Na 2 O-B 2 O 3 -SiO 2 vitrified bond is difficult to obtain satisfying properties including bending strength, impact strength, fracture mode, heat transfer, chemical durability, and interfacial strength. Therefore, some researchers have explored the methods by adding alumina, calcium and/or zinc oxides, and so on in order to improve the property of grinding tool [10][11][12][13][14][15].…”