In situ synthesis mechanism of 15R-SiAlON reinforced Al2 O3 refractories by Fe-Si liquid phase sintering

2017 ◽  
Vol 101 (5) ◽  
pp. 1870-1879 ◽  
Author(s):  
Haixia Qin ◽  
Yong Li ◽  
Menglong Long ◽  
Xi Nie ◽  
Peng Jiang ◽  
...  
Keyword(s):  
Liquid Phase ◽  
In Situ Synthesis ◽  
Liquid Phase Sintering ◽  
Synthesis Mechanism

Microstructure and Properties of In Situ Fabricated Al-5wt.%Si-Al2O3 Composites

2012 ◽  
Vol 567 ◽  
pp. 15-20 ◽  
Author(s):  
Ling Cheng ◽  
De Gui Zhu ◽  
Ying Gao ◽  
Wei Li ◽  
Bo Wang
Keyword(s):  
Shear Strength ◽  
Liquid Phase ◽  
Solid Phase ◽  
Hold Time ◽  
Aluminum Matrix ◽  
Liquid Phase Sintering ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
X Ray

Alumina reinforced aluminum matrix composites (Al-5wt.%Si-Al2O3) fabricated by powder metallurgy through hot isotactic pressing were sintered in different processes, i.e. solid and liquid phase sintering. Optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive X-ray (EDX) techniques were used to characterize the sintered composites. The effects of solid phase and liquid phase sintering on density, microstructure, microhardness, compression and shear strength were investigated. It was found that in situ chemical reaction was completed in solid phase sintering, but the composites had lower microhardness, comprehension and shear strength due to low density and segregation of alumina and Si particles in microstructure. Segregation of reinforcement particles in solid phase sintering resulted from character of solid reaction and Si diffusion at high temperature over a long hold time.

Wear resistance of in situ MMC produced by supersolidus liquid phase sintering (SLPS)

Wear ◽  
2009 ◽  
Vol 267 (11) ◽  
pp. 1791-1797 ◽  
Author(s):  
Hans Berns ◽  
Anastasia Saltykova
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Liquid Phase Sintering

scholarly journals Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1889
Author(s):  
Yupeng Shen ◽  
Zhifu Huang ◽  
Lei Zhang ◽  
Kemin Li ◽  
Zhen Cao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Liquid Phase ◽  
Rupture Strength ◽  
Liquid Phase Sintering ◽  
Maximum Hardness ◽  
Liquid Phases ◽  
Ti Content ◽  
Ti Addition

Four series of Mo2FeB2-based cermets with Ti contents between 0 wt.% and 1.5 wt.% in 0.5 wt.% increments were prepared by in situ reaction and liquid phase sintering technology. Influences of Ti on microstructure and mechanical properties of cermets were studied. It was found that Ti addition increases formation temperatures of liquid phases in liquid-phase stage. Ti atoms replace a fraction of Mo atoms in Mo2FeB2 and the solution of Ti atoms causes the Mo2FeB2 crystal to be equiaxed. In addition, the cermets with 1.0 wt.% Ti content exhibit the smallest particle size. The solution of Ti atoms in Mo2FeB2 promotes the transformation of Mo2FeB2 particles from elongated shape to equiaxed shape. With Ti content increasing from 0 wt.% to 1.5 wt.%, the hardness and transverse rupture strength (TRS) first increase and then decrease. The maximum hardness and TRS occur with 1.0 wt.% Ti content. However, the fracture toughness decreases as Ti content increases. The cermets with 1.0 wt.% Ti content show excellent comprehensive mechanical properties, and the hardness, fracture toughness, and TRS are HRA 89.5, 12.9 MPa∙m1/2, and 1612.6 MPa, respectively.

Wear Resistant In Situ MMC Sintered with FeBC Liquid Phase

2011 ◽  
Vol 672 ◽  
pp. 91-98 ◽  
Author(s):  
Anastasia Saltykova ◽  
Hans Berns
Keyword(s):  
Liquid Phase ◽  
Mesh Size ◽  
Steel Powder ◽  
Liquid Phase Sintering ◽  
Full Density ◽  
Steel Matrix ◽  
Tungsten Carbides ◽  
Component Mixture ◽  
Wear Resistant

Powder metallurgy represents a good alternative to a conventional casting process to produce wear resistant materials. MMC (metal matrix composite) of a hardenable steel matrix and hard phases compacted by hot isostatic pressing (HIP) are highly wear resistant but high in price. In the present study liquid phase sintering was preferred to HIP and expensive hard phases as tungsten carbides were replaced by ferrotitanium particles (FeTi) to reduce costs. A mixture of gas atomized hot work steel powder of < 150 µm in size, hypereutectic FeBC powder of < 36 µm in size as liquid phase donor (LPD) and ferrotitanium particles (100-150 µm in size) with about 70 mass% of Ti was sintered in vacuum to give a wear resistant MMC of full density. However, the elements B and C from LPD diffused to the steel powder before the liquid phase appeared. Therefore these two powders merged into a near-eutectic or hypoeutectic constitution. The LPD was diluted by the steel. During sintering the ferrotitanium particles are transformed in situ into hard phases (in situ HP) with a Fe-rich core surrounded by a hard TiC case to withstand abrasive wear. Numerous investigations by LOM, SEM with EDX, WDX and DTA were realized step by step for a deeper understanding of what happens in the initial three-component mixture during liquid phase sintering and how the in situ MMC forms. The resistance to wear was measured by pin-on-plate tests against abrasive paper of different hardness and mesh size and compared with HIP-MMC and SLPS-MMC.

In situ synthesis mechanism of ZrB2–ZrN composite

2007 ◽  
Vol 452-453 ◽  
pp. 130-134 ◽  
Author(s):  
Hailei Zhao ◽  
Jianlin Wang ◽  
Zhiming Zhu ◽  
Wei Pan ◽  
Jian Wang
Keyword(s):  
In Situ Synthesis ◽  
Synthesis Mechanism

scholarly journals Fabrication, microstructure, and properties of SiC/Al4SiC4 multiphase ceramics via an in-situ formed liquid phase sintering

2020 ◽  
Vol 9 (2) ◽  
pp. 193-203 ◽  
Author(s):  
Junwen Liu ◽  
Xiaobing Zhou ◽  
Peter Tatarko ◽  
Qin Yuan ◽  
Lan Zhang ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Microstructure And Properties ◽  
Multiphase Ceramics
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