Grindability and abrasive behavior of coal blends: analysis and prediction

2019 ◽  
pp. 1-27
Author(s):  
Alamin Idris ◽  
Zakaria Man ◽  
Azmi Bustam ◽  
Nurul Ekmi Rabat ◽  
Fahim Uddin ◽  
...  
Keyword(s):  
Abrasive Behavior

Characteristics of Diamond Abrasive Used in Magnetic Abrasive Finishing of Nickel-Based Superalloys

2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Jason Ratay ◽  
Pei-Ying Wu ◽  
Alex Feirvezers ◽  
Hitomi Yamaguchi
Keyword(s):  
Turbine Blades ◽  
Target Surface ◽  
Surface Finishing ◽  
Complex Geometries ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Particles ◽  
Abrasive Finishing ◽  
Wide Range ◽  
Abrasive Behavior ◽  
Diamond Abrasive

Abstract Nickel-based superalloys have a wide range of high-temperature applications such as turbine blades. The complex geometries of these applications and the specific properties of the materials raise difficulties in the surface finishing. Magnetic abrasive finishing (MAF) has proven effective in finishing the complex geometries. In MAF, the magnetic properties of the workpiece, tool, and abrasive play important roles in controlling finishing characteristics. This paper presents the effects of nickel coating on the abrasive behavior during finishing and resulting finishing characteristics of Ni-based superalloys. The Ni-coated diamond abrasive is more attracted to the magnet than the Ni-based superalloy surface. As a result, fewer Ni-coated diamond abrasive particles, which are stuck between the magnetic-particle brush and the target surface, participate in surface finishing. Because of this, coupled with the reduced sharpness of abrasive cutting edges due to the coating, Ni-coated diamond abrasive cannot effectively smooth the target surface in MAF. However, the Ni coating is worn off during finishing of the hard, rough, additively manufactured surface. Then, the diamond abrasive participates in finishing as uncoated diamond abrasive and facilitates the material removal, finishing the target surface.

Two-body abrasive behavior of brake pad dry sliding against interpenetrating network ceramics/Al-alloy composites

Wear ◽  
2010 ◽  
Vol 268 (7-8) ◽  
pp. 939-945 ◽  
Author(s):  
S.Y. Zhang ◽  
S.G. Qu ◽  
Y.Y. Li ◽  
W.P. Chen
Keyword(s):  
Dry Sliding ◽  
Al Alloy ◽  
Brake Pad ◽  
Interpenetrating Network ◽  
Abrasive Behavior

Research on the Constraint Mechanism of Abrasive Particle of MR Effect-Based Tiny-Grinding Wheel

2010 ◽  
Vol 135 ◽  
pp. 46-51
Author(s):  
Jing Fu Chai ◽  
Qiu Sheng Yan ◽  
Ling Ye Kong ◽  
Min Li
Keyword(s):  
Magnetic Field ◽  
Material Removal ◽  
Abrasive Particle ◽  
Machining Process ◽  
Grinding Wheel ◽  
Constrained Model ◽  
Abrasive Behavior ◽  
Mr Effect ◽  
Polishing Tool ◽  
The Magnetic Field

To improve the effect of magnetorheological finishing (MRF), it is necessary to control the behavior of abrasive particle effectively in machining process. This article described the machining principle of semi-bond abrasives under the MR effect, then, analyzed the magnetic field of the polishing tool. Based on the magnetic field theory, the constrained model of abrasive particle was established, consequently, the force and the machining behavior of abrasive particle were analyzed. And an experiment was carried out to analyze the effect of the abrasive behavior on the material removal. The results show that the experimental results are identical with the theoretical analysis. Therefore, the control of the particle behavior in process is proved to be available.

Mechanical Properties and Abrasive Behavior of Diamond Incorporated Epoxy Composites

2012 ◽  
Vol 727-728 ◽  
pp. 1757-1762 ◽  
Author(s):  
Camila Rodrigues Amaral ◽  
Rubén Jesus Sánchez Rodríguez ◽  
Lucivan P.B. Junior ◽  
Ana Lúcia Diegues Skury ◽  
Sérgio Neves Monteiro
Keyword(s):  
Mechanical Properties ◽  
Mechanical Analysis ◽  
Stoichiometric Ratio ◽  
Matrix Composites ◽  
High Pressure And Temperature ◽  
Dynamic Mechanical ◽  
Diamond Particles ◽  
Abrasive Behavior ◽  
Improved Performance ◽  
Wear Tests

The thermal and mechanical properties assessed respectively by dynamic mechanical analysis and flexural bend tests as well as the abrasive behavior obtained by wear tests of diamond particles incorporated epoxy matrix composites were investigated. Diamond particles with sizes in the range of 45 to 115 µm, synthesized at high pressure and temperature, were mixed in amounts of 20 and 40 wt% with dyglycidyl of the bisphenol A, DGEBA, epoxy resin cured with stoichiometric ratio of tetraetylenepentamine, TEPA, hardener. These composites were dynamic mechanical, DMA analyzed and three points bend tested. The behavior of the composites as abrasive tool for industrial polishing of ornamental rocks was evaluated by wear tests. The results showed an improved performance of the DGEBA/TEPA composites with incorporation of diamond particles.

Study of Internal Finishing of Austenitic Stainless Steel Capillary Tubes by Magnetic Abrasive Finishing

2006 ◽  
Vol 129 (5) ◽  
pp. 885-892 ◽  
Author(s):  
Hitomi Yamaguchi ◽  
Takeo Shinmura ◽  
Ryota Ikeda
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
High Speed ◽  
Magnetic Force ◽  
Capillary Tubes ◽  
Stainless Steel Capillary ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Inner Diameter ◽  
Abrasive Behavior

This paper studies the internal finishing of capillary tubes using a magnetic abrasive finishing process. Such tubes are used with nanoscale technologies and meet the demands of the present age in medical and chemical equipment. The finishing characteristics are influenced by the magnetic abrasive behavior against the inner surface of the capillary, which is controlled by the supplied amount of magnetic abrasive and the magnetic force acting on it. The development of the finishing unit identifies the characteristics of the magnetic field, which controls the magnetic force, required for the necessary magnetic abrasive behavior. Finishing experiments using SUS304 austenitic stainless steel capillary tube with 800μm inner diameter demonstrate the effects of the supplied amount of the magnetic abrasive on the finishing characteristics, and the results suggest a standard method to determine the amount to achieve sufficient finishing. The run-out of the capillary while rotating at high speed under the cantilever tube support method causes instability of the magnetic abrasive behavior. The effects on the finishing characteristics are discussed, and a method to diminish the run-out is applied. Accordingly, this paper presents the conditions required for the internal finishing of capillary tubes and proposes methods to realize them. The internal finishing of 400μm inner diameter capillary tubes conveys an understanding of the mechanisms involved and demonstrates the usefulness of the proposed methods.

Wet abrasive behavior of composite materials obtained from solid residuals mixed with polymer and ceramic matrix

2014 ◽  
Vol 40 (7) ◽  
pp. 9345-9353 ◽  
Author(s):  
J. Vite-Torres ◽  
M. Vite-Torres ◽  
J.R. Laguna-Camacho ◽  
J.E. Escalante-Martínez ◽  
E.A. Gallardo-Hernández ◽  
...  
Keyword(s):  
Composite Materials ◽  
Ceramic Matrix ◽  
Abrasive Behavior ◽  
Solid Residuals

Factors Affecting the Finishing Characteristics of an Internal Magnetic Abrasive Finishing Process for High Purity Fittings

2004 ◽  
Author(s):  
Hitomi Yamaguchi ◽  
Takeo Shinmura ◽  
Megumi Sekine
Keyword(s):  
Magnetic Field ◽  
High Purity ◽  
Target Surface ◽  
Magnetic Abrasive Finishing ◽  
Factors Affecting ◽  
Shaped Tube ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
Abrasive Behavior ◽  
The Magnetic Field

In the case of internal finishing of the bent section of a complex shaped tube, such as found in high purity fittings, by a magnetic abrasive finishing process, the magnetic field at the finishing area and, therefore, the finishing force are hardly uniform over the entire finishing area due to the geometry. This affects the abrasive behavior against the inner surface of the bent section, changing the finishing characteristics of SUS304 stainless steel fittings. In practice, non-uniformities in the surface finish remain at the bent section between the inside, outside, and lateral regions. This unevenness combines to cause difficulties in achieving uniform finishing. Magnetic abrasive is generally supplied with ferrous particles, and the ferrous particles experience greater magnetic force and play a role in pressing the magnetic abrasive against the target surface. This paper studies the finishing mechanism in view of the relationship between the magnetic field, the ferrous particles mixed with magnetic abrasive, and the finishing characteristics. The experiments identify the finishing conditions required for successfully diminishing the non-uniformity in the finished surface, and methods are recommended to satisfy the required conditions. The experiments using the proposed methods show the feasibility of producing a uniformly finished mirror surface.

Impact abrasive behavior of SiCp/2024Al composites in single pendulum scratch testing

Wear ◽  
1994 ◽  
Vol 178 (1-2) ◽  
pp. 9-15 ◽  
Author(s):  
Y.N. Liang ◽  
Z.Y. Ma ◽  
S.Z. Li ◽  
S. Li ◽  
J. Bi
Keyword(s):  
Scratch Testing ◽  
Abrasive Behavior
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