scholarly journals Ductile-Brittle Transition Behaviour of Lithium Metasilicate/Disilicate Glass-Ceramics in Diamond Grinding

2021 ◽  
Vol 2044 (1) ◽  
pp. 012091
Author(s):  
K. Lu ◽  
D.S. Ge ◽  
Z.J. Chen ◽  
Q.P. He ◽  
J. Xie ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Lithium Metasilicate ◽  
Brittle Transition ◽  
Diamond Grinding ◽  
Transition Behaviour

scholarly journals Effect of Corrosive Media on the Chemical and Mechanical Resistance of IPS e.max® CAD Based Li2Si2O5 Glass-Ceramics

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 365
Author(s):  
Anna Švančárková ◽  
Dagmar Galusková ◽  
Aleksandra Ewa Nowicka ◽  
Helena Pálková ◽  
Dušan Galusek
Keyword(s):  
Wear Resistance ◽  
Acetic Acid ◽  
Prolonged Exposure ◽  
Glass Ceramics ◽  
Mechanical Resistance ◽  
Two Stage ◽  
Lithium Metasilicate ◽  
Dynamic Conditions ◽  
One Stage ◽  
Stage Process

The influence of 4% acetic acid (pH~2.4) and an alkaline solution of NaOH (pH~10) on the corrosion resistance and micromechanical properties of disilicate crystals containing glass-ceramics (LS2-GC’s) is studied. Partially crystallized lithium metasilicate crystal containing glass-ceramics (LS-GC’s) are annealed to fully LS2-GC’s using a one stage and a two-stage heating to induce nucleation. Materials with various chemical and wear resistance are prepared. The content of the crystalline phase in the material annealed in the two-stage process A is 60.0% and increases to 72.2% for the material heated in the one-stage process B. The main elements leached in the acidic medium are lithium and phosphorus, while lithium, silicon, and phosphorus leached into the alkaline environment. Material B exhibits better chemical resistance to the corrosive influence of 4% acetic acid under quasi-dynamic conditions. In the alkaline corrosion medium, silicon is leached from material A faster compared to the material B. After prolonged exposure to acidic or basic environments, both materials show evidence of surface structural changes. A decrease of the sliding wear resistance is observed after corrosion in the acidic environment under dynamic conditions. In both materials, the wear rate increases after corrosion.

Evaluation of the Ductile-Brittle Transition Behaviour of Aging Specimens by the Fracture Toughness Test

2006 ◽  
Vol 321-323 ◽  
pp. 536-540
Author(s):  
Hyung Ick Kim ◽  
Yong Huh ◽  
Jae Sil Park ◽  
Chang Sung Seok
Keyword(s):  
Fracture Toughness ◽  
Low Temperatures ◽  
Fracture Toughness Test ◽  
Evaluation Technique ◽  
Brittle Transition ◽  
Ductile Brittle Transition Temperature ◽  
Specimen Test ◽  
Safety And Reliability ◽  
Brittle Transition Temperature ◽  
Transition Behaviour

The safety and reliability of industrial machineries and structures used in various, and severe conditions has become an increasing concern. This study proposes ductile-brittle transition temperature (DBTT) evaluation technique by the sub-sized specimen test to prevent cleavage fracture. Four classes of the thermally aged 1Cr-1Mo-0.25V specimens were prepared. The fracture toughness tests were performed on sub-sized specimens both at room and low temperatures. The results of the fracture toughness tests were analyzed to obtain the DBT behaviours of the specimen materials

Microgrinding of lithium metasilicate/disilicate glass-ceramics

2021 ◽  
Author(s):  
Kuo Lu ◽  
Zhaojie Chen ◽  
Yihao Luo ◽  
Pu Huang ◽  
Quanpeng He ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Lithium Metasilicate

scholarly journals Ductile-brittle transition behaviour of PLA/o-MMT films during the physical aging process

2015 ◽  
Vol 9 (3) ◽  
pp. 185-195 ◽  
Author(s):  
M. Ll. Maspoch ◽  
O. O. Santana ◽  
J. Cailloux ◽  
E. Franco-Urquiza ◽  
C. Rodriguez ◽  
...  
Keyword(s):  
Aging Process ◽  
Physical Aging ◽  
Brittle Transition ◽  
Transition Behaviour
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