Effect of Auxiliary on the Dispersibility of ZrB2 Powder in the Liquid

2017 ◽  
Vol 893 ◽  
pp. 105-109
Author(s):  
Jie Guang Song ◽  
Xiu Qin Wang ◽  
Long Tao Liu ◽  
Zhi Hui Li ◽  
Ru Xin Deng ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
Spark Plasma Sintering ◽  
Composite Powder ◽  
Precipitation Method ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Co Precipitation

The composite ZrB2 powder coated A12O3-Y2O3 prepared by co-precipitation method were densified via the spark plasma sintering (SPS) and then researched the oxidation resistance at high temperature. ZrB2 powder must have the better dispersibility during the coating processing for obtaining the better coating effect. Effect of dispersant on the dispersibility of ZrB2 powder in the liquid is researched in this paper, the results show ZrB2 powder have the better dispersibility as the dispersant for PMAA and the content for 2vol%, which lay foundation for synthsising the better coating effect coated A12O3-Y2O3-ZrB2 composite powder.

Sintering Character of Coated Al2O3-Y2O3/ZrB2 Composite Powder Materials via Spark Plasma Sintering

2013 ◽  
Vol 804 ◽  
pp. 42-46
Author(s):  
Jie Guang Song ◽  
Ming Han Xu ◽  
Xiu Qin Wang ◽  
Shi Bin Li ◽  
Gang Chang Ji
Keyword(s):  
High Temperature ◽  
Spark Plasma Sintering ◽  
Composite Powder ◽  
Raw Materials ◽  
Powder Materials ◽  
Composite Powders ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Co Precipitation ◽  
Multi Phase

ZrB2 has some excellent physical performance and chemical stability, it has been widely applied in a lot of fields. In order to improve disadvantages of ZrB2 that the sintering densification of ZrB2 is too difficult, and it is easy oxidized at high temperature, in this paper, the sintering character of coated A12O3-Y2O3/ZrB2 composite powder materials via spark plasma sintering were investigated. Al2O3-Y2O3/ZrB2 composite powders were prepared by a co-precipitation methods. When the pH is 9, the encapsulted structure of A1(OH)3-Y(OH)3/ZrB2 composite powders is the best. By analyzing the ZrB2 surface status with TEM, the A12O3-Y2O3/ZrB2 composite powders were prepared under the calcining conditions of 600°C¡æ in argon. The high density ZrB2-YAG multi-phase ceramics are prepared via spark splama sintering, which indicate the raw materials adding A12O3-Y2O3 help for the densification of ZrB2 ceramics.

Tunable thermopower and thermal conductivity in Lu doped In2O3

RSC Advances ◽  
2014 ◽  
Vol 4 (60) ◽  
pp. 31926-31931 ◽  
Author(s):  
BeiBei Zhu ◽  
Ruoming Tian ◽  
Tianshu Zhang ◽  
Richard Donelson ◽  
Thiam Teck Tan ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Hall Effect ◽  
Carrier Concentration ◽  
Spark Plasma Sintering ◽  
Valence State ◽  
Hall Effect Measurement ◽  
Precipitation Method ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Co Precipitation

Lu doped polycrystalline In2O3 compounds (x = 0, 0.025, 0.05, 0.10, 0.15) were synthesized by a co-precipitation method followed by the spark plasma sintering processing. Hall Effect measurement indicates that the carrier concentration was drastically decreased with doping, although Lu and In have the same valence state.

Influence of Coated Composite Powders on the Properties of ZrB2-YAG-Al2O3 Ceramics

2014 ◽  
Vol 602-603 ◽  
pp. 451-456
Author(s):  
Jie Guang Song ◽  
Xiu Qin Wang ◽  
Fang Wang ◽  
Shi Bin Li ◽  
Gang Chang Ji
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Composite Powder ◽  
Raw Materials ◽  
Protective Layer ◽  
Ceramic Materials ◽  
Composite Powders ◽  
Plasma Sintering ◽  
Spark Plasma

ZrB2, YAG and Al2O3 are widely applied because of some excellent performances, but ZrB2 is easily oxidized in the high-temperature air. To make the ZrB2 ceramics obtain better oxidation resistance, high-density ZrB2-YAG-Al2O3 ceramics were prepared. The influences of coated composite powders on the densification and the oxidation resistance of ZrB2-YAG-Al2O3 ceramics were investigated. The 80wt%ZrB2-YAG-Al2O3 multiphase ceramic materials from different composite raw materials with the spark plasma sintering technique were successfully prepared. The densification of ZrB2-YAG-Al2O3 ceramics with Al2O3-Y2O3 composite powder coated is easier than that of ZrB2-YAG-Al2O3 ceramics with YAG-Al2O3 powder mixed. The reaction temperature is lower than the 1100¡æ for synthesizing YAG powders from Al2O3-Y2O3 composite powders. The weight gain are increased with increased the oxidation temperature. B2O3 is reacted with Al2O3 to form Al18B4O33, Al18B4O33 is melted and coated on the surface of ceramics to form a protective layer for the oxidation resistance of ceramics at high temperature. The oxidation weight gain of ZrB2-YAG-Al2O3 ceramic with Al2O3-Y2O3 composite powder coated is lower than that of ZrB2-YAG-Al2O3 ceramic with YAG-Al2O3 powder mixed.

scholarly journals High Temperature Oxidation Resistance Performance of TiC/Mo Composite by Spark Plasma Sintering

2021 ◽  
Author(s):  
Renheng HAN ◽  
Ziming BAO ◽  
Yanqin ZHU ◽  
Ning LI ◽  
Ming TANG ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
Oxidation Resistance ◽  
Spark Plasma Sintering ◽  
High Temperature Oxidation ◽  
Oxidation Process ◽  
Temperature Oxidation ◽  
Plasma Sintering ◽  
The Matrix ◽  
Spark Plasma

In this paper, the Titanium carbide/Molybdenum (TiC/Mo) alloy was prepared by spark plasma sintering (SPS). The oxidation process of the TiC/Mo alloy at different oxidation temperatures was studied, and the oxidation mechanism was discussed in depth. The focus is on the influence of the introduction of TiC particles on the high-temperature oxidation properties of Mo alloys. The phase composition and morphology of the oxide film were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results showed that, after oxidation, the surface oxide film is mainly composed of Titanium dioxide (TiO2), Molybdenum dioxide (MoO2), Molybdenum trioxide (MoO3) and Molybdenum oxide hydrate (MoO3(H2O)2) phases. As the oxidation temperature increases, the surface of the oxide film will warp, and thereby increase porosity. The dense MoO2 will form a protective inner oxide layer and inhibit further progress of the TiC/Mo alloy. Oxygen will undergo violent oxidation through the pores and the inside of the matrix, and the protective MoO2 internal oxide film will disappear. TiC particles dispersed in the matrix will be oxidized to form TiO2, which will be gradually deposited on the surface of the oxide film, hindering the diffusion of oxygen to the matrix. The quantity loss during the entire oxidation process is significantly reduced. Therefore, the introduction of TiC can greatly improve the oxidation resistance of Mo alloys.

High Temperature Oxidation of Cr-ZrO2-Al2O3 Composite Fabricated by Mechanical Alloying and Spark Plasma Sintering

2006 ◽  
Vol 509 ◽  
pp. 129-134
Author(s):  
U. Arce-Colunga ◽  
F.A. Reyes-Valdes ◽  
A. Martínez-Villafañe ◽  
Victor M. Orozco-Carmona ◽  
F. Almeraya-Calderón ◽  
...  
Keyword(s):  
High Temperature ◽  
Mechanical Alloying ◽  
Oxidation Resistance ◽  
Spark Plasma Sintering ◽  
High Temperature Oxidation ◽  
Composite Powders ◽  
Temperature Oxidation ◽  
Near Surface ◽  
Plasma Sintering ◽  
Spark Plasma

The high temperature oxidation resistance of Cr-ZrO2-Al2O3 composites fabricated by mechanical alloying and spark plasma sintering (SPS) has been evaluated. Composite powders were prepared by ball milling Cr-5vol%ZrO2-50vol%Al2O3 powder mixtures. Powders were compacted by SPS in less than 5 min, so that a particular metal-ceramic interpenetrating network is obtained. High temperature oxidation tests (900-1100 0C) in air have revealed good oxidation resistance (1.8, 2.6 and 15.3 mg/cm2 at 900, 1000 and 1100 °C, respectively) due to a protective Cr2O3 layer. EDX analysis revealed that Cr diffusion takes place at 1100 oC from the bulk towards the composite surface leading to Cr depletion at near-surface zones. Chromium contained in the bulk tends to oxidize through oxygen diffusion apparently occurring along the grain boundaries.

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