Inert matrices for the transmutation of actinides: fabrication, thermal properties and radiation stability of ceramic materials

1998 ◽  
Vol 271-273 ◽  
pp. 544-548 ◽  
Author(s):  
M. Burghartz ◽  
Hj. Matzke ◽  
C. Léger ◽  
G. Vambenepe ◽  
M. Rome
Keyword(s):  
Thermal Properties ◽  
Ceramic Materials ◽  
Radiation Stability ◽  
Inert Matrices

A Systematic Material Design Approach to Develop Self-Lubricating Ceramic-Composite Tool Inserts for Dry Cutting Conditions

2019 ◽  
Author(s):  
Syed Sohail Akhtar
Keyword(s):  
Fracture Toughness ◽  
Thermal Properties ◽  
Volume Fraction ◽  
Mean Field ◽  
Material Design ◽  
Ceramic Materials ◽  
Ceramic Composites ◽  
Design Stage ◽  
Mechanical And Thermal Properties ◽  
Dry Cutting

Abstract A systematic approach is the focus of the current work in order to design and develop ceramic composites for cutting tool inserts with a balanced combination of structural and thermal properties together with enhanced antifriction characteristics. In the material design stage, various combinations of ceramic materials and inclusions with optimum self-lubricating attributes are selected based on predictions of mechanical and thermal properties using in-house built codes. A mean-field homogenization scheme is used to predict the constitutive behavior while J-integral based fracture toughness model is used to predict the effective fracture toughness of the ceramic composites. An effective medium approximation is used to predict the potential optimum thermal properties. The current strategy incorporates thermal and structural properties of composites as a constraint on the design process together with self-lubrication property. Among various metallic and carbon-based fillers, silicon carbide (SiC) together with titanium oxide (TiO2) and graphite are found the most suitable candidate fillers in alumina (Al2O3) matrix to produce cutting inserts with best combinations of thermal, structural and tribological properties. As a validation, various combinations of Al2O3-SiC-TiO2 and Al2O3-SiC-TiO2 composites are developed in line with the designed range of filler size and volume fraction using Spark Plasma Sintering (SPS) process to complement the material design.

scholarly journals Investigation of the thermal properties of mullite-cordierite materials

2018 ◽  
Vol 118 ◽  
pp. 111-118
Author(s):  
О. V. Savvova ◽  
O. I. Fesenko ◽  
V. D. Timofeеv ◽  
Ya. V. Poviderna
Keyword(s):  
Heat Treatment ◽  
Thermal Properties ◽  
Fire Resistance ◽  
Glass Ceramic ◽  
Linear Expansion ◽  
High Strength ◽  
Ceramic Materials ◽  
Glass Ceramic Materials ◽  
Cordierite Glass ◽  
Coefficient Of Linear Expansion

Based on the analysis of existing mullite-cordierite sitalls, the need to create high-strength materials of this type for individual and local protection against high-speed loads has been determined. They should be characterized by lower cost, due to low-temperature short-term heat treatment using domestic raw materials. An important aspect of ensuring the effective protective effect of an armor-element, in addition to its armor resistance and survivability, is the ability to withstand the effects of open flame and combustible mixtures, which is determined by the thermal properties of the sitalls. The aim of this work is to study the thermal properties, namely thermal expansion coefficient and fire resistance, high strength mullite-cordierite glass-ceramics that they are developed by us earlier. The temperature coefficient of linear expansion was determined using a quartz vertical dilatometer QVD-5A (ASTM C 372-94 (2007)), fire resistance according to GOST 33000—2014. According to X-ray diffraction and differential thermal analyzes, the experimental samples were divided into two groups according to the formation mechanism of structure and phase composition of glass materials during heat treatment. For each of the materials groups, the influence of the chemical and phase compositions on the thermal coefficient of linear expansion of the original mullite-cordierite glass materials and glass-ceramic materials (sitalls) thermally treated using two-stage heat treatment was determined. The study of the fire resistance of the developed glass-ceramic materials made it possible to establish that they withstand the thermal load in a certain mode for 360 minutes. It has been established that providing high thermal- and fire resistance (RE 360 (h)) is a determining factor in the production of hardened glass crystalline materials that are able to resist to thermal destroying at sharp temperature change.

Irradiation Effects in some Crystalline Ceramics*

1967 ◽  
Vol 11 ◽  
pp. 418-433
Author(s):  
W. V. Cummings
Keyword(s):  
Amorphous State ◽  
Ceramic Materials ◽  
High Energy ◽  
Radiation Stability ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Irradiation Effects ◽  
Structure Damage ◽  
Predominant Factor ◽  
Ray Effects

AbstractIrradiation effects that have been observed in the structures of a number of ceramic materials are reviewed. Results of X-ray diffraction studies indicate that, to a great extent, the magnitudes of the crystallographic changes depend upon the type of crystal structure. However, the nature of the atomic bonding and the type of radiation can be the predominant factor in radiation stability in some materials. Damage mechanisms that have been investigated include: (1) fast-neutron and high-energy garnma-ray effects, (2) transmutation effects in high-neutron crosssection materials, and (3) lire effects of the (n, α) reaction in various bolide-containing structures. Some crystallographic changes observed include lattice parameter changes and structure damage of various magnitudes, the appearance of a transmutat. on product structure, and changes from the crystalline to the amorphous state.

Thermally Conductive Ceramics for Electronic Packaging

1989 ◽  
Vol 111 (3) ◽  
pp. 192-198 ◽  
Author(s):  
D. Suryanarayana
Keyword(s):  
Thermal Properties ◽  
Aluminum Nitride ◽  
Physical Properties ◽  
Thermal Performance ◽  
Electronic Packaging ◽  
Recent Literature ◽  
Ceramic Materials ◽  
Unique Material ◽  
Thermally Conductive ◽  
Conductive Ceramics

A survey was conducted on the physical properties of several new ceramic systems, such as carbides, borides, oxides, and nitrides, as they appeared in recent literature, and they are briefly reviewed. A few new ceramic materials, such as BeO, BN, AlN, and SiC-BeO, possess superior thermal properties when compared to the alumina (Al2O3) ceramics used in electronic packaging. Among these, the aluminum nitride (AlN) has emerged as unique material that can replace alumina in future electronic packaging for improved thermal performance and reliability.

scholarly journals High Temperature Ceramic Materials

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2031
Author(s):  
Shaowei Zhang
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
High Temperature ◽  
Melting Point ◽  
Erosion Resistance ◽  
Ceramic Materials ◽  
High Melting ◽  
High Melting Point ◽  
Physiochemical Properties ◽  
Industrial Sectors

Thanks to their superior physiochemical properties such as high melting point, excellent mechanical properties, good thermal properties, and great corrosion/erosion resistance, high temperature ceramic materials (HTCM) find applications in a broad range of demanding areas or industrial sectors, e [...]

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