The Influence of Loading Force on Ultrasonic Drilling Garnet Ferrite

1988 ◽

Vol 46 ◽

pp. 742-743

Author(s):

E. Bischoff ◽

O. Sbaizero

Keyword(s):

Heat Treatment ◽

Aluminum Silicate ◽

Lithium Aluminum ◽

Interfacial Region ◽

Specimen Preparation ◽

Crack Wake ◽

Pull Out ◽

Annealed Material ◽

Ultrasonic Drilling ◽

Fiber Matrix Interface

Fiber or whisker reinforced ceramics show improved toughness and strength. Bridging by intact fibers in the crack wake and fiber pull-out after failure contribute to the additional toughness. These processes are strongly influenced by the sliding and debonding resistance of the interfacial region. The present study examines the interface in a laminated 0/90 composite consisting of SiC (Nicalon) fibers in a lithium-aluminum-silicate (LAS) glass-ceramic matrix. The material shows systematic changes in sliding resistance upon heat treatment.As-processed samples were annealed in air at 800 °C for 2, 4, 8, 16 and 100 h, and for comparison, in helium at 800 °C for 4 h. TEM specimen preparation of as processed and annealed material was performed with special care by cutting along directions having the fibers normal and parallel to the section plane, ultrasonic drilling, dimpling to 100 pm and final ionthinning. The specimen were lightly coated with Carbon and examined in an analytical TEM operated at 200 kV.

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Identification of a new source of magnon relaxation in interface between epitaxial iron garnet ferrite films and GGG substrate.

Materials Research Bulletin ◽

10.1016/j.materresbull.2021.111691 ◽

2021 ◽

pp. 111691

Author(s):

A.N. Kuzmichev ◽

V.I. Belotelov ◽

Y.M. Bunkov ◽

P.M. Vetoshko ◽

A.I. Popov ◽

...

Keyword(s):

Garnet Ferrite ◽

Ferrite Films ◽

Iron Garnet

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Machinability Evaluation in the Ultrasonic Drilling (USD) Process of Aluminum Oxide-based Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.223.804 ◽

2011 ◽

Vol 223 ◽

pp. 804-812

Author(s):

R. S. Jadoun

Keyword(s):

Aluminum Oxide ◽

Mathematical Models ◽

Removal Rate ◽

Ceramic Materials ◽

Performance Characteristics ◽

Machining Parameters ◽

Ultrasonic Drilling ◽

The Face ◽

Face Centered ◽

Central Composite

The ultrasonic drilling (USD) has been used in the manufacture of the hard, fragile, difficult to cut, nonconductive ceramic materials. In this study, the mathematical models of material removal rate (MRR) and surface roughness (SR) have been obtained for the machinability evaluation in the USD process of aluminum oxide-based ceramic material. The experimental plan adopts the face centered central composite design (CCD). The mathematical models using the response surface methodology (RSM) are developed so as to investigate the influences of three machining parameters, including the power rating, grit size and slurry concentration on the performance characteristics of MRR and SR. It has been proved that the proposed mathematical models in this study would fit and predict values of the performance characteristics, which would be close to the readings recorded in experiment with a 95% confidence level. The significant parameters that critically affect the performance characteristics are examined.

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Precise Drilling of Holes in Alumina Ceramic (Al2O3) by Rotary Ultrasonic Drilling and its Parameter Optimization using MOGA-II

Materials ◽

10.3390/ma13051059 ◽

2020 ◽

Vol 13 (5) ◽

pp. 1059 ◽

Cited By ~ 1

Author(s):

Hisham Alkhalefah

Keyword(s):

Feed Rate ◽

Dimensional Accuracy ◽

Alumina Ceramic ◽

Process Variables ◽

Multi Objective Genetic Algorithm ◽

Ultrasonic Drilling ◽

Drilling Quality ◽

Processing Techniques ◽

Validation Tests ◽

Rotary Ultrasonic Drilling

Alumina is an advanced ceramic with applications in dental and medical sciences. Since ceramics are hard and brittle, their conventional machining is expensive, arduous, and time-consuming. As rotary ultrasonic machining is among the most adequate and proficient processing techniques for brittle materials like ceramics. Therefore, in this study, rotary ultrasonic drilling (RUD) has been utilized to drill holes on alumina ceramic (Al2O3). This study investigates the effect of key RUD process variables, namely vibration frequency, vibration amplitude, spindle speed, and feed rate on the dimensional accuracy of the drilled holes. A four-variable three-level central composite design (thirty experiments on three sample plates) is utilized to examine the comparative significance of different RUD process variables. The multi-objective genetic algorithm is employed to determine the optimal parametric conditions. The findings revealed that material removal rates depend on feed rate, while the cylindricity of the holes is mostly controlled by the speed and feed rate of the spindles. The optimal parametric combination attained for drilling quality holes is speed = 4000 rpm, feed rate = 1.5 (mm/min), amplitude = 20 (µm), and frequency = 23 (kHz). The validation tests were also conducted to confirm the quality of drilled holes at the optimized process parameters.

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