scholarly journals Property Evaluation and Fabrication of WC-Co-Si3N4 Hard Materials by a Rapid Sintering Process

2021 ◽  
Author(s):  
Jeong-Han Lee ◽  
Hyun-Kuk Park
Keyword(s):  
Sintering Process ◽  
Hard Materials ◽  
Property Evaluation ◽  
Rapid Sintering

Consolidation and Mechanical Properties of Nanostructured SiC from Mechanically Activated Powder by High-Frequency Induction-Heated Sintering

2010 ◽  
Vol 123-125 ◽  
pp. 635-638
Author(s):  
In Jin Shon ◽  
Hyun Su Kang ◽  
Na Ra Park ◽  
In Yong Ko
Keyword(s):  
Mechanical Properties ◽  
High Frequency ◽  
Sintering Behavior ◽  
Hard Material ◽  
Induced Current ◽  
Sintering Process ◽  
Simultaneous Application ◽  
Hard Materials ◽  
Rapid Sintering ◽  
High Frequency Induction

The rapid sintering of nanostuctured SiC hard materials was investigated with high-frequency induction heating sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and prohibition of grain growth in nanostuctured materials. A dense nanostructured SiC hard material was produced with simultaneous application of 500 MPa pressure and induced current within 2 minutes. The effect of the ball milling times on the sintering behavior, grain size and mechanical properties of binderless SiC was investigated.

Sintering of binderless WC–Mo2C hard materials by rapid sintering process

2008 ◽  
Vol 34 (6) ◽  
pp. 1419-1423 ◽  
Author(s):  
Hwan-Cheol Kim ◽  
Hyun-Kuk Park ◽  
In-Kyoon Jeong ◽  
In-Yong Ko ◽  
In-Jin Shon
Keyword(s):  
Sintering Process ◽  
Hard Materials ◽  
Rapid Sintering

Retention of nanostructure in aluminum oxide by very rapid sintering at 1150 °C

1995 ◽  
Vol 10 (2) ◽  
pp. 237-239 ◽  
Author(s):  
Subhash H. Risbud ◽  
Chien-Hua Shan ◽  
Amiya K. Mukherjee ◽  
Moon J. Kim ◽  
J.S. Bow ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Aluminum Oxide ◽  
Resistance Heating ◽  
Sintering Process ◽  
Oxide Powders ◽  
Transmission Electron ◽  
Rapid Sintering ◽  
Electron Energy Loss ◽  
Plasma Activated Sintering

Aluminum oxide powders doped with MgO (300 to 500 nm) were sintered to almost theoretical density within just 10–15 min at 1150 °C using a plasma-activated sintering process based on charging the loosely filled powders with an electric discharge prior to densification by resistance heating. The microstructure of the consolidated disks was examined by high resolution transmission electron microscopy (HREM) and electron energy loss spectroscopy (EELS) and revealed excellent grain to grain contact with virtually no grain growth and structurally clean grain boundaries.

Laser Rapid Sintering of Metallo-Organic Derived Oxide Films

1990 ◽  
Vol 201 ◽  
Author(s):  
Rong-Fuh Louh ◽  
Relva C. Buchanan
Keyword(s):  
Oxide Films ◽  
Film Surface ◽  
Processing Parameters ◽  
Probe Laser ◽  
Sintering Process ◽  
Spatial Grain ◽  
Rapid Sintering ◽  
Compositional Variations ◽  
Film Substrate ◽  
Deposited Film

AbstractOxide films of ZrO2, Y2O3, yttria stabilized zirconia (YSZ), and high Tc superconducting YBa2Cu3O7-x and Bi-Sr-Ca-Cu-O films were produced by spin coating metallo-organic precursors onto Si, ZrO2 and MgO single crystal substrates. Densification of these oxide films, after pyrolysis of organic constituents, was achieved by scanning a Nd:YAG laser beam across the film surface. Surface morphology, microstructures, spatial grain size distribution, compositional variations, defects and physical properties of laser sintered films were characterized using SEM, EDS, TEM, SIMS, XRD and 4-point electrical resistivity probe. Laser processing parameters, deposited film thickness and organic burn-off showed strong influences on the film densification behavior. This paper focuses on pursuing optimum conditions for obtaining dense, uniform sintered patterns in oxide films and on understanding the film-substrate interaction and dynamics of nucleation and growth via the laser rapid sintering process.

Dense and optical transparent CdWO4 films by sol-gel processing for scintillation applications

2007 ◽  
Vol 22 (6) ◽  
pp. 1527-1536 ◽  
Author(s):  
H.M. Shang ◽  
M. Bliss ◽  
S. Heald ◽  
T.K. Sham ◽  
F. Heigl ◽  
...  
Keyword(s):  
Sol Gel ◽  
Tungstic Acid ◽  
Cadmium Nitrate ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optical Luminescence ◽  
Optically Transparent ◽  
Rapid Sintering ◽  
Gel Processing

In this paper, we report the first successful fabrication of dense and optically transparent cadmium tungstate (CWO) films by sol-gel processing and the study of their optical and x-ray scintillation properties. A new sol-gel processing method was developed using tungstic acid and cadmium nitrate as precursors and hydrogen peroxide as solvent; homogeneous and stable CWO sols were aged at room temperature and used for the preparation of CWO films. A rapid sintering process was investigated and found to be necessary to make dense and optically transparent nanocrystalline CWO films. CWO films were uniform, fully dense, and crack-free, with CWO as the only detectable crystalline phase, as determined by x-ray diffraction. The thickness, density, grain size, and crystallinity of CWO films are all found to be strongly dependent on the sintering conditions and in turn impact the optical and x-ray scintillation properties. Sol-gel-derived dense CWO films demonstrated intense photoluminescence and x-ray excited optical luminescence intensity. The relationships between sol-gel processing, nanostructures, and optical and x-ray scintillation properties are discussed in detail.

scholarly journals Modification of Densification Mechanisms By The Timing of Mechanical Pressure During Spark Plasma Sintering

2021 ◽  
Author(s):  
David Salamon ◽  
Hua Tan ◽  
Haibo Zhang
Keyword(s):  
Grain Size ◽  
Alumina Powder ◽  
Sintering Process ◽  
Mechanical Pressure ◽  
Vapor Transfer ◽  
Plasma Sintering ◽  
Nano Alumina ◽  
Diffusion Enhancement ◽  
Spark Plasma ◽  
Rapid Sintering

Abstract The application of mechanical pressure during a sintering process is connected with grains sliding and diffusion enhancement. However, the timing of mechanical pressure during the rapid sintering process was not addressed. In the present study, four different timings of mechanical pressure with final pressure 50 MPa starting from the beginning, 600 ℃, 900 ℃ and at sintering temperature, furthermore one pressure-less SPS have been studied during SPS of Nano-Alumina powder (Taimei, Japan) at 1100 ℃, 1150 ℃, 1200 ℃, and 1300 ℃, respectively. The density, hardness, microstructure, and grain size of each sample were measured and calculated carefully. The results show that applying the pressure at 900 ℃ brings high density and small grain size, leading to the best Vickers hardness. The interaction between pressure and vapor, leading to the different vapor transfer rate of the first sintering stage, is considered as a reason for the differences in the microstructure.

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