Journal of Materials Engineering and Performance ( IF 2.2 ) Pub Date : 2021-09-14 , DOI: 10.1007/s11665-021-06204-2 Ankur Sharma 1 , Dagarapu Benny Karunakar 1
|
Abstract
A comparative study was carried out on the synthesis of ZrB2-25 vol.% SiC-(5, 10 and 15 vol.%) TiC composites through microwave sintering (MS) and spark plasma sintering (SPS). The effects of TiC inclusion on sinterability, microstructures, phase analysis and mechanical characteristics of ZrB2-SiC composites processed through MS and SPS were examined and compared. The structural integrity of ZrB2-based composites was enhanced by TiC addition due to generation of lower tensile residual stresses in the matrix phase and higher compressive residual stresses in the reinforcement phase. The composites developed by SPS exhibited higher relative density, hardness and compressive strength, whereas higher fracture toughness was observed for composites developed by MS. Results indicated that SPS sintered Z25S10T composite exhibited maximum relative density, microhardness, compressive strength and minimum open porosity of 99.38 ± 0.26%, 24.78 ± 1.06 GPa, 349.01 ± 16.72 MPa and 0.37 ± 0.11%, respectively. The maximum fracture toughness of 6.36 ± 0.296 MPa m1/2 along with maximum critical energy release rate of 93.275 ± 4.64 J/m2 was obtained for Z25S15T composite developed through MS. The higher fracture toughness of microwave sintered composites could be attributed to the activation of several strengthening mechanisms like deflection, bridging and impeding of cracks.
Graphical Abstract
中文翻译：
微波和火花等离子烧结ZrB2-SiC-TiC复合材料的显微结构和力学性能对比评价
摘要
对通过微波烧结 (MS) 和放电等离子体烧结 (SPS)合成 ZrB 2 -25 vol.% SiC-(5、10 和 15 vol.%) TiC 复合材料进行了对比研究。研究并比较了 TiC 夹杂物对通过 MS 和 SPS 加工的 ZrB 2 -SiC 复合材料的可烧结性、微观结构、相分析和机械特性的影响。ZrB 2的结构完整性由于在基体相中产生较低的拉伸残余应力和在增强相中产生较高的压缩残余应力，添加 TiC 增强了 β 基复合材料。SPS 开发的复合材料具有更高的相对密度、硬度和抗压强度，而 MS 开发的复合材料具有更高的断裂韧性。结果表明，SPS 烧结 Z25S10T 复合材料的最大相对密度、显微硬度、抗压强度和最小开孔率分别为 99.38 ± 0.26%、24.78 ± 1.06 GPa、349.01 ± 16.72 MPa 和 0.37 ± 0.11% 最大断裂韧性为 6.36 ± 0.296 MPa m 1/2，最大临界能量释放率为 93.275 ± 4.64 J/m 2为通过 MS 开发的 Z25S15T 复合材料获得。微波烧结复合材料较高的断裂韧性可归因于几种强化机制的激活，如偏转、桥接和裂纹阻碍。
京公网安备 11010802027423号