Studies on a new type of PbTiO3piezoelectric ceramic materials

1999 ◽  
Vol 229 (1) ◽  
pp. 261-265 ◽  
Author(s):  
Taosheng Zhou ◽  
Yunbin He ◽  
Xunzhong Shang ◽  
Yuanwei Zhang ◽  
Anxiang Kuang
Keyword(s):  
Ceramic Materials ◽  
New Type

Standardization of Antibacterial Bone China

2010 ◽  
Vol 178 ◽  
pp. 367-370
Author(s):  
Li Juan Wang ◽  
Jin Sheng Liang
Keyword(s):  
Antibacterial Agent ◽  
Ceramic Materials ◽  
Antibacterial Mechanism ◽  
Bone China ◽  
New Type

The developments of antibacterial ceramics technology were introduced. A new type of antibacterial agent used in bone china, multifuntional healthy ceramic materials antibacterial mechanism, was discussed. With the quick development of antibacterial bone china technology and market, it was necessary to estabish the antibacterial bone china standard.

scholarly journals Biological inter-dependencies in 3D printing: Larvae scaffold excavation of high filigree clay structures

2021 ◽  
Author(s):  
◽  
Mark Bagley
Keyword(s):  
3D Printing ◽  
Complex Geometry ◽  
Ceramic Materials ◽  
Shell Structures ◽  
Secondary Material ◽  
Novel Approach ◽  
Design And Manufacturing ◽  
New Type ◽  
Technological Constraints ◽  
The Relationship

<p>Ceramic 3D printing has emerged in recent years as a new method for working with age-old material, a blend of the digital and analog that breeds a new type of artisan. Working with clay in an FDM extrusion system presents a number of challenges due to the nature of the material, restricting the forms that can be produced to rudimentary levels of ornament and shape. This research tackles the issue of resolution and thickness when creating and designing shell structures from ceramic materials, notably when 3D printing is used for complex geometry. This research aims to navigate these material and technological constraints by designing a novel approach to support scaffolds using a secondary material. This secondary material serves as an organic encasement for the ceramic object, and nature is treated as a co-collaborator in the excavation and controlled curing of a high filigree clay structure. By introducing edible bio matter and/or cellulose solutions, this encourages a new relationship with nature as a tool and co-author, becoming a stakeholder in the final result. This research examines the relationship between human, machine, and nature in the design and manufacturing of products.</p>

scholarly journals Biological inter-dependencies in 3D printing: Larvae scaffold excavation of high filigree clay structures

2021 ◽  
Author(s):  
◽  
Mark Bagley
Keyword(s):  
3D Printing ◽  
Complex Geometry ◽  
Ceramic Materials ◽  
Shell Structures ◽  
Secondary Material ◽  
Novel Approach ◽  
Design And Manufacturing ◽  
New Type ◽  
Technological Constraints ◽  
The Relationship

<p>Ceramic 3D printing has emerged in recent years as a new method for working with age-old material, a blend of the digital and analog that breeds a new type of artisan. Working with clay in an FDM extrusion system presents a number of challenges due to the nature of the material, restricting the forms that can be produced to rudimentary levels of ornament and shape. This research tackles the issue of resolution and thickness when creating and designing shell structures from ceramic materials, notably when 3D printing is used for complex geometry. This research aims to navigate these material and technological constraints by designing a novel approach to support scaffolds using a secondary material. This secondary material serves as an organic encasement for the ceramic object, and nature is treated as a co-collaborator in the excavation and controlled curing of a high filigree clay structure. By introducing edible bio matter and/or cellulose solutions, this encourages a new relationship with nature as a tool and co-author, becoming a stakeholder in the final result. This research examines the relationship between human, machine, and nature in the design and manufacturing of products.</p>

scholarly journals Application of Macrofiber Composite for Smart Transducer of Lamb Wave Inspection

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Gang Ren ◽  
Kyung-Young Jhang
Keyword(s):  
Defect Detection ◽  
Lamb Wave ◽  
Ceramic Materials ◽  
High Amplitude ◽  
Piezoelectric Transducers ◽  
Artificial Defect ◽  
Structural Health ◽  
Bonding Condition ◽  
New Type ◽  
Smart Transducer

Macrofiber composite (MFC) has been developed recently as a new type of smart material for piezoelectric transducers. It shows advantages over traditional piezoelectric ceramic materials (PZT) including the method of application, sensitivity, and cost. It can be embedded on the structure, which provides the possibility to monitor the structural health in real time. In this paper, the feasibility of this transducer for the Lamb wave inspection has been experimentally explored. A pair of MFC patches is bonded on a 2 mm thick aluminum plate, and it has been demonstrated that the dispersive characteristics of S0 and A0 modes, generated and detected by MFC patches, agreed well with the theory. The influence of the bonding condition of the transducer was also tested to show that rigid bonding is required to assure a high amplitude signal. In order to illustrate the performance of defect detection, an artificial defect fabricated on the surface of a specimen was inspected in the pitch-catch mode. The results showed that the MFC transducer is a promising Lamb wave transducer for nondestructive testing (NDT) and structural health monitoring (SHM).

The Microstructure of Shock-Synthesized Diamond

1967 ◽  
Vol 25 ◽  
pp. 324-325
Author(s):  
Lucien F. Trueb
Keyword(s):  
Single Crystals ◽  
Preferred Orientation ◽  
High Magnification ◽  
Texture Pattern ◽  
Shock Process ◽  
New Type ◽  
Diffraction Diagram

A new type of synthetic industrial diamond formed by an explosive shock process has been recently developed by the Du Pont Company. This material consists of a mixture of two basically different forms, as shown in Figure 1: relatively flat and compact aggregates of acicular crystallites, and single crystals in the form of irregular polyhedra with straight edges.Figure 2 is a high magnification micrograph typical for the fibrous aggregates; it shows that they are composed of bundles of crystallites 0.05-0.3 μ long and 0.02 μ. wide. The selected area diffraction diagram (insert in Figure 2) consists of a weak polycrystalline ring pattern and a strong texture pattern with arc reflections. The latter results from crystals having preferred orientation, which shows that in a given particle most fibrils have a similar orientation.

Examination of Fracture Interfaces in Silicon Nitride

1975 ◽  
Vol 33 ◽  
pp. 60-61
Author(s):  
Nancy J. Tighe
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Slow Crack Growth ◽  
Ceramic Materials ◽  
Grain Boundary Sliding ◽  
Boundary Phase ◽  
Turbine Engines ◽  
Boundary Sliding

Silicon nitride is one of the ceramic materials being considered for the components in gas turbine engines which will be exposed to temperatures of 1000 to 1400°C. Test specimens from hot-pressed billets exhibit flexural strengths of approximately 50 MN/m2 at 1000°C. However, the strength degrades rapidly to less than 20 MN/m2 at 1400°C. The strength degradition is attributed to subcritical crack growth phenomena evidenced by a stress rate dependence of the flexural strength and the stress intensity factor. This phenomena is termed slow crack growth and is associated with the onset of plastic deformation at the crack tip. Lange attributed the subcritical crack growth tb a glassy silicate grain boundary phase which decreased in viscosity with increased temperature and permitted a form of grain boundary sliding to occur.

New type electron gun with electrostatic and electromagnetic lenses

1978 ◽  
Vol 36 (1) ◽  
pp. 62-63
Author(s):  
T. Ichinokawa ◽  
H. Maeda
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Optimum Condition ◽  
Bias Voltage ◽  
Electron Gun ◽  
Charge Effect ◽  
Micro Fabrication ◽  
Maximum Brightness ◽  
New Type ◽  
The Ideal

I. IntroductionThermionic electron gun with the Wehnelt grid is popularly used in the electron microscopy and electron beam micro-fabrication. It is well known that this gun could get the ideal brightness caluculated from the Lengumier and Richardson equations under the optimum condition. However, the design and ajustment to the optimum condition is not so easy. The gun has following properties with respect to the Wehnelt bias; (1) The maximum brightness is got only in the optimum bias. (2) In the larger bias than the optimum, the brightness decreases with increasing the bias voltage on account of the space charge effect. (3) In the smaller bias than the optimum, the brightness decreases with bias voltage on account of spreading of the cross over spot due to the aberrations of the electrostatic immersion lens.In the present experiment, a new type electron gun with the electrostatic and electromagnetic lens is designed, and its properties are examined experimentally.

A new type of defect structure in 124-superconducting oxide revealed by HREM

1991 ◽  
Vol 49 ◽  
pp. 1092-1093
Author(s):  
R. Sharma ◽  
B.L. Ramakrishna ◽  
N.N. Thadhani ◽  
D. Hianes ◽  
Z. Iqbal
Keyword(s):  
Shock Wave ◽  
Defect Structure ◽  
Neutron Radiation ◽  
Weak Links ◽  
Defect Structures ◽  
New Materials ◽  
New Type ◽  
Current Densities ◽  
Processing Techniques ◽  
Microstructural Studies

After materials with superconducting temperatures higher than liquid nitrogen have been prepared, more emphasis has been on increasing the current densities (Jc) of high Tc superconductors than finding new materials with higher transition temperatures. Different processing techniques i.e thin films, shock wave processing, neutron radiation etc. have been applied in order to increase Jc. Microstructural studies of compounds thus prepared have shown either a decrease in gram boundaries that act as weak-links or increase in defect structure that act as flux-pinning centers. We have studied shock wave synthesized Tl-Ba-Cu-O and shock wave processed Y-123 superconductors with somewhat different properties compared to those prepared by solid-state reaction. Here we report the defect structures observed in the shock-processed Y-124 superconductors.

ESEM - A multipurpose surface Electron Microscope

1986 ◽  
Vol 44 ◽  
pp. 632-633 ◽  
Author(s):  
G.D. Danilatos
Keyword(s):  
Electron Microscope ◽  
Room Temperature ◽  
Environmental Scanning ◽  
Gas Composition ◽  
Saturated Water Vapor ◽  
Surface Electron ◽  
Current State ◽  
Saturated Water ◽  
New Type ◽  
Temperature And Pressure

Over recent years a new type of electron microscope - the environmental scanning electron microscope (ESEM) - has been developed for the examination of specimen surfaces in the presence of gases. A detailed series of reports on the system has appeared elsewhere. A review summary of the current state and potential of the system is presented here.The gas composition, temperature and pressure can be varied in the specimen chamber of the ESEM. With air, the pressure can be up to one atmosphere (about 1000 mbar). Environments with fully saturated water vapor only at room temperature (20-30 mbar) can be easily maintained whilst liquid water or other solutions, together with uncoated specimens, can be imaged routinely during various applications.

Trial production of γ-type energy filtering TEM

1995 ◽  
Vol 53 ◽  
pp. 604-605
Author(s):  
Y. Taniguchi ◽  
E. Nakazawa ◽  
S. Taya
Keyword(s):  
Magnetic Energy ◽  
Electron Optics ◽  
Electron Microscopic ◽  
Mass Spectrometers ◽  
Ion Optics ◽  
Energy Filtering ◽  
New Information ◽  
New Type ◽  
Fringing Fields

Imaging energy filters can add new information to electron microscopic images with respect to energy-axis, so-called electron spectroscopic imaging (ESI). Recently, many good results have been reported using this imaging technique. ESI also allows high-contrast observation of unstained biological samples, becoming a trend of the field of morphology. We manufactured a new type of energy filter as a trial production. This energy filter consists of two magnets, and we call γ-filter since the trajectory of electrons shows ‘γ’-shape inside the filter. We evaluated the new energyγ-filter TEM with the γ-filter.Figure 1 shows schematic view of the electron optics of the γ-type energy filter. For the determination of the electron-optics of the γ-type energy filter, we used the TRIO (Third Order Ion Optics) program which has been developed for the design of high resolution mass spectrometers. The TRIO takes the extended fringing fields (EFF) into consideration. EFF makes it difficult to design magnetic energy filters with magnetic sector fields.

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