Rapid synthesis of bulk Ti2AlC by self-propagating high temperature combustion synthesis with a pseudo–hot isostatic pressing process

2009 ◽  
Vol 24 (8) ◽  
pp. 2528-2535 ◽  
Author(s):  
Yuelei Bai ◽  
Xiaodong He ◽  
Yibin Li ◽  
Chuncheng Zhu ◽  
Sam Zhang
Keyword(s):  
High Temperature ◽  
Combustion Synthesis ◽  
Hot Isostatic Pressing ◽  
X Ray Diffraction ◽  
Phase Purity ◽  
X Ray ◽  
Isostatic Pressing ◽  
Pressing Process ◽  
Temperature Combustion ◽  
High Temperature Combustion

In this study, the dense polycrystalline Ti2AlC was synthesized by self-propagating high-temperature combustion synthesis with the pseudo–hot isostatic pressing process (SHS/PHIP). The resultant phase purity is highly dependent on the mol ratio of raw powders. The Ti2AlC was densified by applying pressure after the SHS reaction. The resultant sample mainly contains typical plate-like nonstoichiometric Ti2AlCx (x = 0.69) with grain size of ∼6 µm. The sample shows the Vickers hardness of 5.5 GPa, highest flexural strength of 431 MPa, compressive strength of 1033 MPa, and fracture toughness of 6.5 MPa·m1/2. No indentation cracks in Ti2AlCx were observed, indicative of a damage material nature. The reaction mechanism for the formation of SHS/PHIP-derived Ti2AlC is also discussed based on differential thermal analysis and x-ray diffraction results.

Ti2AlN Prepared by Self-Propagating High-Temperature Combustion Method Using TiN as Additive

2013 ◽  
Vol 710 ◽  
pp. 37-40
Author(s):  
Jia Jin Tian ◽  
Li Li Zhang ◽  
Xiong Wei Bi ◽  
Gui Yang Liu ◽  
Zhi Mei Ding
Keyword(s):  
High Temperature ◽  
Raw Materials ◽  
Synthesis Method ◽  
Combustion Method ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
High Temperature Synthesis ◽  
Temperature Combustion ◽  
Micro Morphology ◽  
High Temperature Combustion

Ti2AlN ceramic have been prepared by self-propagating high-temperature synthesis method using Ti, Al and TiN mixture as raw materials under different N2 pressures. X-ray diffraction (XRD) and scanning electron microscope (SEM) have been used to determine the phase composition and micro morphology of the products. XRD analysis indicates that the main phase of the products is layered ternary compound Ti2AlN, but there are TiN and AlTi3 impurities in the products. With increasing N2 pressure, the relative content of TiN and AlTi3 decreases. SEM imagines exhibits that the grains of the products become larger with increasing N2 pressures.

Large-Scale (Ti,Cr)B2-Cu Composite by Combustion Synthesis

2007 ◽  
Vol 280-283 ◽  
pp. 1441-1444 ◽  
Author(s):  
Qiang Xu ◽  
Xing Hong Zhang ◽  
Jie Cai Han ◽  
Xiao Dong He
Keyword(s):  
Solid Solution ◽  
Combustion Synthesis ◽  
Large Scale ◽  
Bending Strength ◽  
Hot Isostatic Pressing ◽  
Solution Phase ◽  
Skeletal Structure ◽  
Solid Solution Phase ◽  
X Ray Diffraction ◽  
X Ray

Large-scale (Ti,Cr)B2-Cu composite from Ti, Cr, B and Cu powders was produced by combining combustion synthesis with Pseudo Hot Isostatic Pressing. The diameter of the synthesized product is 240 millimeter. The product was identified using X-ray diffraction and the result showed that only (Ti,Cr)B2 and Cu phases, without other phases, existed in the product. The analysis of the microstructure indicated that the skeletal structure had been formed in the (Ti,Cr)B2 solid solution phase. Fine (Ti,Cr)B2 reinforcement grew in near equivalent axis-like shape and some sintering neckings were found between the solid solution phases. The relative density of the synthesized product was 93.6% because the skeletal structure baffled the densification of the composite. The bending strength and fracture toughness of the product were 476 MPa and 6.8 MPa·m1/2 respectively.

Sign in / Sign up

Export Citation Format

Share Document