High-temperature synthesis in activated powder mixtures under conditions of linear heating: Ni–Al system

2021 ◽  
Vol 223 ◽  
pp. 88-97
Author(s):  
Valeriy Yu. Filimonov ◽  
Vadim G. Prokof'ev
Keyword(s):  
High Temperature ◽  
Temperature Synthesis ◽  
Powder Mixtures ◽  
Linear Heating ◽  
High Temperature Synthesis

Fabrication of BN-AlN-TiB2 Compound Conductive Ceramics by Self-Propagating High Temperature Synthesis and Hot Isostatic Pressing

2007 ◽  
Vol 336-338 ◽  
pp. 786-789 ◽  
Author(s):  
Li Juan Zhou ◽  
Yong Ting Zheng ◽  
Shan Yi Du
Keyword(s):  
High Temperature ◽  
Composition Dependence ◽  
Bending Strength ◽  
Hot Isostatic Pressing ◽  
Microstructural Analysis ◽  
Temperature Synthesis ◽  
Powder Mixtures ◽  
Isostatic Pressing ◽  
High Temperature Synthesis ◽  
Conductive Ceramics

BN-AlN-TiB2 compound conductive ceramics from powder mixtures of BN, Al, and TiB2 was fabricated by self-propagating high temperature synthesis (SHS) and hot isostatic pressing (HIP). The powder mixtures were shaped by isostatic cool pressing at 5-10MPa and the combustion reaction was carried at 100-200 MPa N2 by an ignitor. XRD experiments confirmed that the reaction was complete and only AlN, BN and TiB2 were detected. Optical microscopy as well as SEM with an electron probe microanalysis was used for microstructural analysis and revealed a relatively uniform distribution of particulates. The temperature-dependence and composition-dependence of the electrical resistivity of BN-AlN-TiB2 ceramics were studied. The results showed that the optimum composition was 5-10wt% BN, 30-55wt% Al and 60-40wt% TiB2, and the products had the density of 90% of the theoretical, resistivity of 80-1000 μ⋅cm and bending strength of 100-200 MPa.

Synthesis of Nanostructure MoSi2 Powder by Mechanically Assisted Self-Propagating High-Temperature Synthesis

2010 ◽  
Author(s):  
R. Meshkizadeh ◽  
H. Abdollahpour ◽  
A. Honarbakhsh-Raouf
Keyword(s):  
High Temperature ◽  
Ball Milling ◽  
Powder Mixture ◽  
Combustion Temperature ◽  
Combustion Method ◽  
Temperature Synthesis ◽  
Mixed Powder ◽  
Powder Mixtures ◽  
High Temperature Synthesis

Nanostructured MoSi2 powder has been successfully synthesized by Ball milling of Mo and Si powder mixtures and subsequent self-propagating high-temperature synthesis (SHS) process. It was observed that in comparison with the normally mixed powder, it could be easily ignited and higher combustion temperature was achieved. Based on XRD and SEM, it was confirmed that nanostructure MoSi2 powder could be prepared through self propagating combustion method from the mechanical activated powder mixture.

Fabrication of SPS Compacts from Ta, Hf-Containing ZrB2-ZrC Powder Mixtures Synthesized by the MA-SHS in Air Process

2006 ◽  
Vol 45 ◽  
pp. 1041-1046
Author(s):  
T. Tsuchida ◽  
K. Mochizuki
Keyword(s):  
High Temperature ◽  
Molar Ratio ◽  
Matrix Composites ◽  
Temperature Synthesis ◽  
Indentation Method ◽  
Homogeneous Microstructure ◽  
Powder Mixtures ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Spark Plasma

Mechanical Activation assisted Self-propagating High-temperature Synthesis in air (MA-SHS in air process) was successfully applied to the synthesis of the powder mixtures of ZrB2 and ZrC containing Ta and Hf as a precursor of Ultra High Temperature Ceramic (UHTC) matrix composites. When the powder mixtures of (Ta or Hf+Zr)/B/C=2/2/1 (Ta or Hf/Zr=0/2, 0.1/1.9, 0.2/1.8, 0.4/1.6) in molar ratio were mechanically activated (MA) by ball milling for 45-60 min and then exposed to air, they self-ignited spontaneously and the self-propagating high-temperature synthesis (SHS) was occurred to form ZrB2 and ZrC. From these MA-SHS powders, the Ta, Hf-containing ZrB2-ZrC composite compacts having a fine and homogeneous microstructure composed of < 5 μm-sized grains were fabricated by spark plasma sintering (SPS) at 1800°C. The mechanical properties of the composites evaluated by Vickers indentation method was improved by the addition of Ta and showed the values of Vickers hardness (HV) of 16.9 GPa and fracture toughness of 4.3 MPa·m1/2.

Properties of AlN Powder Synthesized by Self-Propagating High Temperature Synthesis Process

2010 ◽  
Vol 434-435 ◽  
pp. 834-837 ◽  
Author(s):  
Jae Hwan Pee ◽  
Jong Chul Park ◽  
Kwang Taek Hwang ◽  
Soo Ryong Kim ◽  
Woo Seok Cho
Keyword(s):  
High Temperature ◽  
Xrd Analysis ◽  
Nitrogen Atmosphere ◽  
Synthesis Process ◽  
Microstructure Development ◽  
Temperature Synthesis ◽  
Powder Mixtures ◽  
Residual Oxygen ◽  
High Temperature Synthesis ◽  
Al Powder

The synthesis of AlN via self-propagating high-temperature synthesis (SHS) was attempted, using various ratio of Al powder mixed with AlN powder as diluents. Al and AlN powder mixtures with various weight ratios were ignited a nitrogen atmosphere with various amounts of carbon as additives. High crystalline AlN by SHS were successfully synthesized. The microstructure development during the reaction and the influence of these additives were determined by SEM and XRD analysis. A mechanism for the formation of high purity AlN with a very low content of residual oxygen (<0.8wt %) was proposed.

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