scholarly journals RADIATION EFFECTS ON THE PHYSICAL PROPERTIES OF POLYMETHYL--METHACRYLATE (thesis)

1965 ◽  
Author(s):  
M T.A. Toosi
Keyword(s):  
Physical Properties ◽  
Polymethyl Methacrylate ◽  
Radiation Effects

Polymethyl Methacrylate Binder Removal from an Alumina Compact: Microwave Versus Conventional Heating

1992 ◽  
Vol 269 ◽  
Author(s):  
Edmund H. Moore ◽  
David E. Clark ◽  
Ronald Hutcheon
Keyword(s):  
Thermal Decomposition ◽  
Dielectric Properties ◽  
Physical Properties ◽  
Polymethyl Methacrylate ◽  
Electric Furnace ◽  
Microwave Field ◽  
Conventional Heating ◽  
Microwave Cavity ◽  
Polymeric Binder ◽  
Binder Removal

ABSTRACTCompact samples of alumina and polymethyl methacrylate have been heated in a 2.45 GHz microwave cavity and by conventional heating in an electric furnace. Various heating schedules have been used to effect the removal of the polymeric binder by thermal decomposition. Dielectric properties, porosity and other physical properties have been investigated in order to better understand the binder removal process in a microwave field. Results of the study emphasize the amount of carbon residuals remaining in the bulk.

Reversible radiation effects in vitreous As2S3. I. changes of physical properties

1994 ◽  
Vol 144 (2) ◽  
pp. 277-283 ◽  
Author(s):  
O. I. Shpotyuk ◽  
A. P. Kovalskii ◽  
M. M. Vakiv ◽  
O. Ya. Mrooz
Keyword(s):  
Physical Properties ◽  
Radiation Effects

Radiation Effects in Ceramics

MRS Bulletin ◽  
1997 ◽  
Vol 22 (4) ◽  
pp. 22-28 ◽  
Author(s):  
G.P. Pells
Keyword(s):  
Physical Properties ◽  
Radiation Effects ◽  
Critical Role ◽  
High Energy ◽  
Refractory Oxide ◽  
High Temperature Strength ◽  
Dislocation Loops ◽  
Damage State ◽  
High Fluences ◽  
High Electrical Resistivity

Ceramics are inorganic, nonmetallic materials, a class that includes solids with both crystalline and glassy (i.e., aperiodic) atomic structures. This article will emphasize radiation effects in conventional refractory oxide ceramics and glasses that display high-temperature strength, chemical inertness, and high electrical resistivity. The introduction to this issue cites various radiation environments to which materials may be exposed; a number of these environments receive mention in this article. However emphasis here is on giving the reader an overview of damage mechanisms and of the changes in key physical properties (optical, thermal, electrical, and mechanical) that can affect the behavior of these materials. The broad subject of radiation-damage phenomena in ceramics has recently been reviewed by Hobbs et al.Even at low doses of energetic radiation, whether particulate or electromagnetic, isolated atomic-level defects may be generated and can offer the potential to induce changes in physical properties. However for some applications such as fission reactors, fusion reactors (now in the conceptual design stages), and high-energy accelerators, one must deal with high fluences capable of generating relatively large damage aggregates such as dislocation loops and voids. Thus one must understand the evolution of damage microstructures from point defects to aggregates in both model materials and engineering ceramics. Even when induced changes are only electronic in nature, the effects on some properties (e.g., electrical conductivity) can be dramatic. In the following sections, evolution of the damage state and consequent changes in key properties are described, with some attention to the often critical role of impurities.

Sign in / Sign up

Export Citation Format

Share Document