Research status and prospects of the iron ore’s high temperature behaviors in the sintering process

2018 ◽  
Vol 115 (6) ◽  
pp. 604
Author(s):  
Xiao-zhe Wang ◽  
Dong-hui Liu ◽  
Jian-liang Zhang ◽  
Zheng-Jian Liu
Keyword(s):  
High Temperature ◽  
Production Technology ◽  
Melting Behavior ◽  
Iron Ores ◽  
Sintering Process ◽  
Sinter Quality ◽  
Research Status ◽  
Basic Characteristics ◽  
Infiltration Behavior ◽  
Sintering Processes

The research status of the iron ore’s high temperature behaviors in the sintering process was reviewed in this paper. The influencing factors of the high temperature behaviors and their effects on the sinter performances were discussed, and the prospects of the optimization of ore proportioning based on the iron ores’ basic characteristics were also proposed. It is suggested that the melting behavior and infiltration behavior of the sintering liquid should be further investigated. Moreover, the limiting links of the sinter quality for different iron ores sintering should be analyzed by combining the basic characteristics and the production technology of the industrial sintering processes. Given priority to the low fuel ratio and the sinter quality, the complementary principles of the iron ores basic characteristics and mathematical models should be used in the optimization of ore proportioning.

Microstructural Study of Diamond Deformed Under High Pressure and Temperature

1985 ◽  
Vol 43 ◽  
pp. 230-231
Author(s):  
E. F. Koch
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Lattice Structure ◽  
Diamond Particle ◽  
Polycrystalline Diamond ◽  
Sintering Process ◽  
Ion Milling ◽  
Sintered Compact ◽  
Transmission Electron ◽  
High Pressure Sintering

Because of the extremely rigid lattice structure of diamond, generating new dislocations or moving existing dislocations in diamond by applying mechanical stress at ambient temperature is very difficult. Analysis of portions of diamonds deformed under bending stress at elevated temperature has shown that diamond deforms plastically under suitable conditions and that its primary slip systems are on the ﹛111﹜ planes. Plastic deformation in diamond is more commonly observed during the high temperature - high pressure sintering process used to make diamond compacts. The pressure and temperature conditions in the sintering presses are sufficiently high that many diamond grains in the sintered compact show deformed microtructures.In this report commercially available polycrystalline diamond discs for rock cutting applications were analyzed to study the deformation substructures in the diamond grains using transmission electron microscopy. An individual diamond particle can be plastically deformed in a high pressure apparatus at high temperature, but it is nearly impossible to prepare such a particle for TEM observation, since any medium in which the diamond is mounted wears away faster than the diamond during ion milling and the diamond is lost.

scholarly journals Pressureless Sintering of YIG Ceramics from Coprecipitated Nanopowders

2021 ◽  
Vol 7 (5) ◽  
pp. 56
Author(s):  
Yimin Yang ◽  
Xiaoying Li ◽  
Ziyu Liu ◽  
Dianjun Hu ◽  
Xin Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Calcination Temperature ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Secondary Phase ◽  
Coprecipitation Method ◽  
Pressureless Sintering ◽  
Densification Behavior ◽  
Sintering Process

Nanoparticles prepared by the coprecipitation method were used as raw materials to fabricate Y3Fe5O12 (YIG) ceramics by air pressureless sintering. The synthesized YIG precursor was calcinated at 900–1100 °C for 4 h in air. The influences of the calcination temperature on the phase and morphology of the nanopowders were investigated in detail. The powders calcined at 1000–1100 °C retained the pure YIG phase. YIG ceramics were fabricated by sintering at 1200–1400 °C for 10 h, and its densification behavior was studied. YIG ceramics prepared by air sintering at 1250 °C from powders calcinated at 1000 °C have the highest in-line transmittance in the range of 1000-3000 nm. When the sintering temperature exceeds 1300 °C, the secondary phase appears in the YIG ceramics, which may be due to the loss of oxygen during the high-temperature sintering process, resulting in the conversion of Fe3+ into Fe2+.

scholarly journals Current Research Status on Cold Sprayed Amorphous Alloy Coatings: A Review

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 206
Author(s):  
Qiang Wang ◽  
Peng Han ◽  
Shuo Yin ◽  
Wen-Juan Niu ◽  
Le Zhai ◽  
...  
Keyword(s):  
High Temperature ◽  
Amorphous Alloy ◽  
Amorphous Alloys ◽  
Composite Coatings ◽  
Thermal Spraying ◽  
Functional Coatings ◽  
Research Status ◽  
Key Issues ◽  
Wear And Corrosion Resistance ◽  
Amorphous Coatings

Compared with traditional crystalline materials, amorphous alloys have excellent corrosion and wear resistance and high elastic modulus, due to their unique short-range ordered and long-range disordered atomic arrangement as well as absence of defects, such as grain boundaries and dislocations. Owing to the limitation of the bulk size of amorphous alloys as structural materials, the application as functional coatings can widely extend their use in various engineering fields. This review first briefly introduces the problems involved during high temperature preparation processes of amorphous coatings, including laser cladding and thermal spraying. Cold spray (CS) is characterized by a low-temperature solid-state deposition, and thus the oxidation and crystallization related with a high temperature environment can be avoided during the formation of coatings. Therefore, CS has unique advantages in the preparation of fully amorphous alloy coatings. The research status of Fe-, Al-, Ni-, and Zr-based amorphous alloy coatings and amorphous composite coatings are reviewed. The influence of CS process parameters, and powders and substrate conditions on the microstructure, hardness, as well as wear and corrosion resistance of amorphous coatings is analyzed. Meanwhile, the deposition mechanism of amorphous alloy coatings is discussed by simulation and experiment. Finally, the key issues involved in the preparation of amorphous alloy coatings via CS technology are summarized, and the future development is also being prospected.

scholarly journals In Situ Hyperspectral Raman Imaging: A New Method to Investigate Sintering Processes of Ceramic Material at High-temperature

2019 ◽  
Vol 9 (7) ◽  
pp. 1310 ◽  
Author(s):  
Kerstin Hauke ◽  
Johannes Kehren ◽  
Nadine Böhme ◽  
Sinje Zimmer ◽  
Thorsten Geisler
Keyword(s):  
High Temperature ◽  
Raman Imaging ◽  
In Situ Studies ◽  
Kinetic Information ◽  
Novel Approach ◽  
In Situ Investigation ◽  
Dependent Growth ◽  
Micrometer Scale ◽  
Sintering Processes

In the last decades, Raman spectroscopy has become an important tool to identify and investigate minerals, gases, glasses, and organic material at room temperature. In combination with high-temperature and high-pressure devices, however, the in situ investigation of mineral transformation reactions and their kinetics is nowadays also possible. Here, we present a novel approach to in situ studies for the sintering process of silicate ceramics by hyperspectral Raman imaging. This imaging technique allows studying high-temperature solid-solid and/or solid-melt reactions spatially and temporally resolved, and opens up new avenues to study and visualize high-temperature sintering processes in multi-component systems. After describing in detail the methodology, the results of three application examples are presented and discussed. These experiments demonstrate the power of hyperspectral Raman imaging for in situ studies of the mechanism(s) of solid-solid or solid-melt reactions at high-temperature with a micrometer-scale resolution as well as to gain kinetic information from the temperature- and time-dependent growth and breakdown of minerals during isothermal or isochronal sintering.

The Research Status of Self-Compensation Lubricating Composites at High Temperature

2013 ◽  
Vol 470 ◽  
pp. 108-111
Author(s):  
Ying Han ◽  
Yan Jun Wang ◽  
Shou Ren Wang
Keyword(s):  
High Temperature ◽  
Matrix Material ◽  
Research Progress ◽  
Lubrication Mechanism ◽  
Research Status

It is significant and necessary to carry out the development of self-compensation lubricating composites. In this paper, the current research of self-lubrication composites is summarized. The lubrication mechanism of the high temperature self-compensation lubricating composites is introduced and the research progress of matrix material and lubricant material of the composites is reviewed.

Experimental Research on Bonding Intensity of Iron Ores in the Sintering Process

2011 ◽  
Vol 391-392 ◽  
pp. 60-64
Author(s):  
Fang Yi Long ◽  
Sheng Li Wu ◽  
Juan Zhu ◽  
Yuan Du ◽  
Guo Liang Zhang
Keyword(s):  
South Africa ◽  
Liquid Phase ◽  
Experimental Research ◽  
Negative Correlation ◽  
Influence Factors ◽  
Iron Ores ◽  
Sintering Process ◽  
Different Types ◽  
Lower Porosity

The bonding intensity of four kinds of ores from Brazil, Australia and South Africa is researched in this study, and the influence factors are analyzed. The results show that, the ores of different types have apparently differences in bonding intensity, ores from Brazil and South Africa have high bonding intensity, while ores from Australia have low bonding intensity; The foundation of generation of effective liquid is adequate liquid phase fluidity and the lower porosity of core ore; The ratio of porosity of core ore and the index of liquid phase fluidity has negative correlation with the bonding intensity.

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