Ceramic-Metal Functionally Gradient Multilayer Composite Fabricated by Combustion Synthesis in High-Gravity Field

2016 ◽  
Vol 680 ◽  
pp. 174-178
Author(s):  
De Jun Yin ◽  
Zhong Min Zhao ◽  
Long Zhang
Keyword(s):  
Gravity Field ◽  
Combustion Synthesis ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
High Gravity ◽  
Multilayer Composite ◽  
Functionally Gradient ◽  
42Crmo Steel ◽  
Multilayer Composites ◽  
High Gravity Field

By taking combustion synthesis in high-gravity field to achieve fusion bonding of TiB2-based ceramic, Ti-6Al-4V alloy, the mid-ceramic and 42CrMo steel simultaneously, the ceramic-metal FG multilayer composites with the continuously-graded interfacial microstructures were successfully fabricated. XRD, FESEM and EDS results showed the formation of continuously-graded interfacial microstructures among TiB2-based ceramic, Ti-6Al-4V alloy, the mid-ceramic and 42CrMo steel resulted from thermal explosion reaction caused by high gravity field, liquid fusion of the ceramic, Ti-6Al-4V alloy, the mid-ceramic and 42CrMo steel, so hard-by-soft distribution in the hardness of FG multilayer composite was presented, and the interfacial shear strength of TiB2-based ceramic and Ti-6Al-4V alloy, and the mid-ceramic and 42CrMo steel measured 198 ± 25 MPa and 130 ± 15 MPa, respectively.

Large Scale Al2O3-ZrO2 (Y2O3) Eutectic and Hypereutectic Achieved by Combustion Synthesis in High Gravity Field

2014 ◽  
Vol 602-603 ◽  
pp. 252-257
Author(s):  
Xiao Bo Lu ◽  
Hong Bo Liu ◽  
Yu Fei Zhang
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Gravity Field ◽  
Combustion Synthesis ◽  
Ceramic Composites ◽  
High Fracture Toughness ◽  
High Gravity ◽  
Transformation Toughening ◽  
High Fracture ◽  
High Gravity Field

By introducing ZrO2 (4Y) powder into the thermit, the solidified Al2O3-ZrO2 (4Y) ceramic composites with eutectic and hypereutectic microstructures were prepared via combustion synthesis in high gravity field, and the microstructures and mechanical properties of the solidified ceramic composites were discussed. XRD, SEM and EDS showed that the Al2O3-33%ZrO2 (4Y) as the eutectic were composed of random-orientated rod-shaped colonies consisting of a triangular dispersion of orderly submicron-nanometer t-ZrO2 fibers, surrounded by inter-colony regions consisting of spherically-shaped micrometer t-ZrO2 grains, whereas Al2O3-45%ZrO2 (4Y) as the hypereutectic were comprised of spherically-shaped micron-meter t-ZrO2 grains, surround by irregularly-shaped α-Al2O3 grains and a few colonies. Compared to the directionally solidified Al2O3-ZrO2 (Y2O3), the increase in hardness and flexural strength of the eutectic obtained in current experiment was due to high densification, small-size defect and high fracture toughness induced by residual stress toughening and transformation toughening mechanisms; meanwhile, in despite of the moderate decrease in hardness, high flexural strength of the hypereutectic was considered to be a result of small-size defect and high fracture toughness induced by transformation toughening and microcrack toughening mechanisms.

Combustion synthesis of TiCxN1−x–TiB2 ceramic composites in a high-gravity field

2011 ◽  
Vol 46 (6) ◽  
pp. 958-961 ◽  
Author(s):  
Guanghua Liu ◽  
Jiangtao Li ◽  
Xiaoshan Ning ◽  
Yixiang Chen
Keyword(s):  
Gravity Field ◽  
Combustion Synthesis ◽  
Ceramic Composites ◽  
High Gravity ◽  
High Gravity Field

scholarly journals Microstructures and Toughening of TiC-TiB2Ceramic Composites with Cr-Based Alloy Phase Prepared by Combustion Synthesis in High-Gravity Field

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Xuegang Huang ◽  
Chun Yin ◽  
Zhongmin Zhao ◽  
Long Zhang ◽  
Junyan Wu
Keyword(s):  
Fracture Toughness ◽  
Gravity Field ◽  
Combustion Synthesis ◽  
Ceramic Composites ◽  
Crack Deflection ◽  
Full Density ◽  
High Gravity ◽  
Average Thickness ◽  
Pull Out ◽  
High Gravity Field

Micro-nanocrystalline microstructures which are characterized by TiB2platelets of the average thickness close to or smaller than 1 μm can be achieved in nearly full-density solidified TiC-TiB2ceramic composites with Cr-based alloy phases by combustion synthesis in ultra-high gravity field of 2500 g. The filler phases in ceramic composites are actually Cr-based alloy with a little solidified solution of Ni atoms and Al atoms. The hardness, flexural strength, and fracture toughness of the materials are 18.5 ± 1.5 GPa, 650 ± 35 MPa, and 16.5 ± 1.5 MPa⋅m0.5, respectively. The improved fracture toughness of TiC-TiB2ceramic composites results from crack deflection, crack bridging, and pull-out by a large number of fine TiB2platelets and plastic deformation with some Cr-based alloy phases.

Fusion-Induced Diffusion Joints of Solidified TiC-TiB2 Ceramic with Stainless Steel and Ti-6Al-4V Alloy Achieved by Combustion Synthesis in High-Gravity Field

2012 ◽  
Vol 512-515 ◽  
pp. 354-359
Author(s):  
Tao Ma ◽  
Long Zhang ◽  
Zhong Min Zhao ◽  
Yi Fei Zhang
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Gravity Field ◽  
Combustion Synthesis ◽  
High Performance ◽  
High Gravity ◽  
Ti Alloy ◽  
Atom Diffusion ◽  
Ultrafine Grained ◽  
High Gravity Field

Based on taking combustion synthesis to prepare high-performance TiC-TiB2 composite in high-gravity field, joint of TiC-TiB2 with stainless steel and Ti-6Al-4V alloy were achieved respectively by the introduction of stainless steel and Ti alloy plates at the bottom of combustion system. Instant melting at surface part of stainless steel and Ti alloy, followed by atom diffusion between liquid TiC-TiB2 ceramic and the molten metal was considered a reason for the achievement of the joint. Because of the presence of both coarsened Al2O3 inclusions nearby the ceramic and the partition layers of Al2O3 between the ceramic and the intermediate, shear strength of joint between the ceramic and stainless steel presented a low value of 120 ± 30 MPa. In contrast, because of the interdiffusion of C, B and Ti atoms between the liquid ceramic and the molten Ti alloy, ultrafine-grained microstructure develops in the ceramic nearby the joint, while the joint characterized by constitutional continuous gradient is also achieved from the ceramic to Ti alloy, resulting in high shear strength of 650 ± 25 MPa between TiC-TiB2 ceramic and Ti-6Al-4V alloy.

Ultra-High-Hard Composites of TiC-TiB2 Prepared by Combustion Synthesis under High Gravity

2010 ◽  
Vol 434-435 ◽  
pp. 13-16 ◽  
Author(s):  
Zhen Sheng Qu ◽  
Quan Yang ◽  
Zhong Min Zhao ◽  
Long Zhang ◽  
Chuan Zeng Pan ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Gravity Field ◽  
Combustion Synthesis ◽  
High Hardness ◽  
High Strength ◽  
High Gravity ◽  
Rapid Separation ◽  
Large Bulk ◽  
High Gravity Field ◽  
Coupled Growth

The large-bulk solidified TiC-TiB2 composites were prepared by combustion synthesis in high-gravity field. XRD, FESEM, SEM and EDS results showed that TiC-TiB2 composites were mainly composed of TiC matrix in which a number of fine TiB2 platelets were embedded, surrounded by the boundary regions consisting of (Cr, Ti) C0.63 carbides. The hardness, flexural strength and fracture toughness of TiC-TiB2 composites measured 28.5GPa, 750±25MPa and 6.2±0.5MPa•m1/2. High hardness of the composites benefits from the absence of the intermediate borides and the achievement of stoichiometric TiC phases due to rapid solidification, whereas the achievement of high strength benefits the refinement and homogeneity of the microstructures due to rapid separation of liquid oxides in high-gravity field and rapid coupled growth of TiC and TiB2 phases.

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