Effect of Sintering Temperature on the Grain Size and Mechanical Properties of Al2O3-SiC Nanocomposites

Abstract

In this research, some mechanical properties of Al 2 O 3-based composites containing nanoSiC and nanoMgO additives, including elasticity modulus, hardness, and fracture toughness, have been evaluated. Micron-sized Al 2 O 3 powders containing 0.08 wt.% nanoMgO particles have been mixed with different volume fractions of nanoSiC particles (2.5 to 15 vol.%). Untreated samples have been sintered by using hot-press technique at temperatures of 1600 to 1750°C. The results show significant increases in the mechanical characteristics with increases in the sintering temperature and amount of nanoSiC particles, with the result that the elasticity modulus, hardness, and fracture toughness were obtained as 426 GPa, 21 GPa, and 4.5 MPa.m 1/2 , respectively.

Synthesis and Characterization of the New Li1+xAl1+xSi1–xO4 (x = 0–0.25) Solid Electrolyte for Lithium-Ion Batteries

“…It is noteworthy that the average grain size increased with the sintering temperature. An increase in the sintering temperature leads to the migration of grain boundaries, and grain growth depends strongly on the sintering temperature. , …”

“…An increase in the sintering temperature leads to the migration of grain boundaries, and grain growth depends strongly on the sintering temperature. 44,45 Electrochemical impedance spectroscopy (EIS) was used to analyze the LASO SE prepared at different sintering temperatures, and the EIS results are shown in Figure 3f. The resistance decreased as the sintered temperature increased (>650 °C).…”

Reactive, nonreactive, and flash spark plasma sintering of Al2O3/SiC composites—A comparative study

“…At high SiC contents, the hardness remains almost constant, while the fracture toughness decreases considerably. It was suggested, that two factors may cause a drop of fracture toughness when the weight fraction of SiC was increased above 20 wt%: (a) a high agglomeration of the SiC particles; (b) an increase of the residual stress, originated by a mismatch of the thermal expansion coefficients between SiC and Al 2 O 3 phases. The FSPS composite had a higher fracture toughness (7.5 MPa m 1/2 ), while RSPS ceramics possess the higher combination of fracture toughness (7.2 MPa m 1/2 ) and hardness (21 GPA).…”

Indentation fracture resistance of brittle materials using irregular cracks: A review

“…In the following years, the accuracy and efficiency of equation (5) for determining fracture resistance in materials such as B 4 C-nanoTiB 2 [ 79 ], B 4 C-nanoSiB 6 [ 80 ], B 4 C-nanoTiB 2 -Fe/Ni [ 81 ], Al 2 O 3 –SiC [ 82 ], Al 2 O 3 –SiC–MgO [ 83 ], B 4 C-nano/microSiC [ 84 ], 3Y-TZP [ 85 ], Al 2 O 3 /3Y-TZP [ 86 ], W–ZrC [ 87 ], and Si particle [ 88 ] were tested. The mechanical and microstructural properties of these materials are diverse and have medical and industrial applications.…”

“…7 compares the accuracy of K IFR obtained from equation (5) for some of the materials made at their optimal sintering temperature. The comparison includes the most practical VIF relations mentioned in Table 1 (relations 5 and 10) and some conventional fracture mechanics techniques such as CNB, SELNB, and SENB methods [ [79] , [80] , [81] , [82] , [83] , [84] , [85] , [86] , [87] , [88] ]. As can be seen, in 90% of the samples, more than 90% accuracy was reported.…”