Mechanical Behavior of Molybdenum-Modified Cr3Si/Cr5Si3 Intermetallics

1996 ◽  
Vol 460 ◽  
Author(s):  
M. Nazmy ◽  
C. Noseda ◽  
S. Augustin ◽  
P. Lipetzky ◽  
N. S. Stoloff
Keyword(s):  
Fracture Toughness ◽  
Thermal Expansion ◽  
Powder Metallurgy ◽  
Flexural Strength ◽  
Mechanical Behavior ◽  
Interfacial Reaction ◽  
Elevated Temperatures ◽  
Base Material ◽  
Different Temperatures ◽  
Limited Diffusion

ABSTRACTTwo molybdenum-modified chromium suicide base intermetallics have been prepared by powder metallurgy and investigated with respect to the hardness, flexural strength and fracture toughness at different temperatures. As toughening phase, tungsten, Pt-6%Rh and Saphikon fibres were tried to improve the toughness of these two intermetallics. The tungsten fibers generated microcracks in the base material due to the large mismatch in the coefficients of thermal expansion (CTE) between the fiber and the intermetallic. The Pt-6%Rh and Saphikon fibers did not exhibit such cracking.An improvement in the fracture toughness was observed especially at elevated temperatures. The Saphikon fibers did not show interfacial reaction. Some limited diffusion of silicon was detected in the Pt-6%Rh phase after 1400°C treatment.

Mechanical Property and Oxidation Behavior of LPS-SiC Materials

2006 ◽  
Vol 321-323 ◽  
pp. 913-916
Author(s):  
Sang Ll Lee ◽  
Yun Seok Shin ◽  
Jin Kyung Lee ◽  
Jong Baek Lee ◽  
Jun Young Park
Keyword(s):  
Mechanical Property ◽  
Fracture Toughness ◽  
Oxidation Behavior ◽  
Elevated Temperatures ◽  
Indentation Test ◽  
Bending Test ◽  
Secondary Phases ◽  
Three Point Bending ◽  
Different Temperatures

The microstructure and the mechanical property of liquid phase sintered (LPS) SiC materials with oxide secondary phases have been investigated. The strength variation of LPS-SiC materials exposed at the elevated temperatures has been also examined. LPS-SiC materials were sintered at the different temperatures using two types of Al2O3/Y2O3 compositional ratio. The characterization of LPS-SiC materials was investigated by means of SEM with EDS, three point bending test and indentation test. The LPS-SiC material with a density of about 3.2 Mg/m3 represented a flexural strength of about 800 MPa and a fracture toughness of about 9.0 MPa⋅√m.

Effect of Y2O3 on the Sintering, Mechanical and Dielectric Properties of Mullite/h-BN Composites

2016 ◽  
Vol 848 ◽  
pp. 28-31
Author(s):  
Han Jin ◽  
Yong Feng Li ◽  
Zhong Qi Shi ◽  
Hong Yan Xia ◽  
Guan Jun Qiao
Keyword(s):  
Fracture Toughness ◽  
Dielectric Constant ◽  
Phase Composition ◽  
High Temperature ◽  
Dielectric Properties ◽  
Liquid Phase ◽  
Flexural Strength ◽  
Sintering Temperature ◽  
Pressureless Sintering ◽  
Different Temperatures

Mullite/10 wt. %h-BN composites with 5 wt. % Y2O3 additive were fabricated by pressureless sintering at different temperatures. The densification, phase composition, microstructure, mechanical and dielectric properties of the mullite/h-BN composites were investigated. With the addition of Y2O3, the sintering temperature of the mullite/h-BN composites declined, while the density, mechanical and dielectric properties all increased. The addition of Y2O3 promoted the formation of liquid phase at high temperature, which accelerated the densification. Besides, Y2O3 particles which were located at the grain boundaries inhibited the grain growth of mullite matrix. For the mullite/h-BN composites with Y2O3 additive, the appropriate sintering temperature was about 1600°C. The relative density, flexural strength, fracture toughness and dielectric constant of the Y2O3 doped mullite/h-BN composite sintered at 1600 °C reached 82%, 135 MPa, 2.3 MPa·m1/2 and 4.9, respectively.

ZYALOX MV30 and ZYALOX MV20

Alloy Digest ◽  
1992 ◽  
Vol 41 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Thermal Expansion ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Elevated Temperatures ◽  
Bend Strength ◽  
Low Thermal Expansion

Abstract ZYALOX MV30 and ZYALOX MV20 are mullites combining low thermal expansion, good mechanical strength and resilience at elevated temperatures. This datasheet provides information on composition, physical properties, microstructure, elasticity, tensile properties, and compressive and bend strength as well as fracture toughness. Filing Code: Cer-10. Producer or source: Vesuvius McDanel.

scholarly journals Sustainable Mortar Made with Local Clay Bricks and Glass Waste Exposed to Elevated Temperatures

2021 ◽  
Vol 7 (8) ◽  
pp. 1341-1354
Author(s):  
Zaid Ali Hasan ◽  
Shereen Qasim Abdulridha ◽  
S. Z. Abeer
Keyword(s):  
Flexural Strength ◽  
Elevated Temperatures ◽  
Mechanical Tests ◽  
Waste Glass ◽  
Fine Aggregate ◽  
Glass Waste ◽  
Natural Sand ◽  
Clay Bricks ◽  
Different Temperatures ◽  
Local Materials

The present study involved assessing the replacement of fine aggregate in the mortar with sustainable local materials like clay bricks and glass included 168 specimens (cubes and prisms). Seven mixtures were cast for this work, one control mix (R1) with 100% natural sand whereas mixes from R2 to R5 have 10% and 20% replacing natural sand with waste clay bricks and waste glass separately and respectively. Mix R6 was included 20% replacing sand with combination waste materials (10% waste clay bricks with 10% waste glass). Mix R7 has involved the same percent of replacing the previous mix R6 but with adding Polypropylene fibers 1% by volume. The samples have put in an electrical oven for one hour at 200, 400, and 600 ᵒC then cooled to room temperature to be tested and compared with samples at normal temperature 24 ᵒC. Different mechanical tests were adopted involved flow tests, density, weight loss, compressive strength, flexural strength, and water absorption. The results at different temperatures were discussed where many findings were specified. The flexural strength at 400 ᵒC was showed improving by 56% for 20% waste clay brick and 69% with 10% waste glass, as well all combination mixes illustrated higher strength than the control. Doi: 10.28991/cej-2021-03091729 Full Text: PDF

Experimental Evaluation of Mechanical Behavior of GaAs Wafer Material

1991 ◽  
Vol 226 ◽  
Author(s):  
Jun Ming Hu ◽  
Michael Pecht ◽  
Donald Barker
Keyword(s):  
Stress Intensity Factor ◽  
Thermal Expansion ◽  
Mechanical Behavior ◽  
Material Properties ◽  
Coefficient Of Thermal Expansion ◽  
Critical Value ◽  
Modulus Of Rupture ◽  
Gaas Wafer ◽  
Different Temperatures ◽  
Temperature Ranges

AbstractThe mechanical behavior of non-metalized GaAs wafer material at different temperatures were evaluated. The material properties of GaAs, including the modulus of elasticity, the modulus of rupture, the critical value of stress intensity factor, and the coefficient of thermal expansion, were experimentally determined over various temperature ranges.

Effect of Annealing on Fracture Toughness Evaluation of Ba0.5Sr0.5Co0.8 Fe0.2O3−δ (BSCF) at Different Temperatures

2014 ◽  
Vol 592-594 ◽  
pp. 816-820 ◽  
Author(s):  
Bablu Sikder ◽  
Abhijit Chanda
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Fracture Stress ◽  
Compressive Residual Stress ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Toughness Evaluation ◽  
Different Temperatures ◽  
Fracture Toughness Evaluation ◽  
Typical Variation

An experimental study on the fracture toughness of BSCF samples were conducted at room temperature as well as elevated temperatures (upto 800°C). The results showed a typical variation of fracture toughness and fracture stress with temperature. It decreased upto 600°C and then increased to reach a comparatively higher value at 800°C. Without annealing the samples showed comparatively higher fracture toughness because of the presence of compressive residual stress.

scholarly journals 3D-Printed vs. Heat-Polymerizing and Autopolymerizing Denture Base Acrylic Resins

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5781
Author(s):  
Leila Perea-Lowery ◽  
Mona Gibreel ◽  
Pekka K. Vallittu ◽  
Lippo V. Lassila
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Water Solubility ◽  
Base Material ◽  
Acrylic Resin ◽  
Denture Base ◽  
3D Printed ◽  
Work Of Fracture

The aim of this work was to investigate the effect of two post-curing methods on the mechanical properties of a 3D-printed denture base material. Additionally, to compare the mechanical properties of that 3D-printed material with those of conventional autopolymerizing and a heat-cured denture base material. A resin for 3D-printing denture base (Imprimo®), a heat-polymerizing acrylic resin (Paladon® 65), and an autopolymerizing acrylic resin (Palapress®) were investigated. Flexural strength, elastic modulus, fracture toughness, work of fracture, water sorption, and water solubility were evaluated. The 3D-printed test specimens were post-cured using two different units (Imprimo Cure® and Form Cure®). The tests were carried out after both dry and 30 days water storage. Data were collected and statistically analyzed. Resin type had a significant effect on the flexural strength, elastic modulus, fracture toughness, and work of fracture (p < 0.001). The flexural strength and elastic modulus for the heat-cured polymer were significantly the highest among all investigated groups regardless of the storage condition (p < 0.001). The fracture toughness and work of fracture of the 3D-printed material were significantly the lowest (p < 0.001). The heat-cured polymer had the lowest significant water solubility (p < 0.001). The post-curing method had an impact on the flexural strength of the investigated 3D-printed denture base material. The flexural strength, elastic modulus, fracture toughness, work of fracture of the 3D-printed material were inferior to those of the heat-cured one. Increased post-curing temperature may enhance the flexural properties of resin monomers used for 3D-printing dental appliances.

Sign in / Sign up

Export Citation Format

Share Document