The Effect of Phase Composition on the Mechanical and Thermal Properties of LTCC Material

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000492-000497
Author(s):  
Kostja Makarovič ◽  
Anton Meden ◽  
Marko Hrovat ◽  
Janez Holc ◽  
Andreja Benčan ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Phase Composition ◽  
Flexural Strength ◽  
Mass Fraction ◽  
Major Change ◽  
Multilayer Structures ◽  
Propagation Mechanism ◽  
Mechanical And Thermal Properties ◽  
Thermal Coefficient ◽  
Biaxial Flexural Strength

Low-temperature co-fired ceramic (LTCC) is an important material in the production of ceramic multilayer structures. Large and complex multilayer structures are usually fired at higher temperatures and/or longer firing times compared to the relatively thin LTCC tapes. The firing conditions of LTCC determine the phase composition and the microstructure, which both influence the physical characteristics, such as the mechanical and thermal properties. In this work the effect of the phase composition on the biaxial flexural strength and the temperature coefficient of expansion of the DuPont 951 LTCC is presented. The samples were fired at different temperatures and times to obtain different phase compositions. The phase composition, especially the mass fraction of anorthite, was correlated with the biaxial flexural strength and the thermal coefficient of expansion (TCE). A very long firing time, i.e., 100h at 800 °C, yields, apart from crystalline anorthite, the cristobalite phase. The anorthite that crystalizes from the glass phase in a dense LTCC material changes the crack-propagation mechanism and improves the biaxial flexural strength of the material. The major change in the biaxial flexural strength is observed when the anorthite phase appeared. The increasing mass fraction of anorthite does improve the biaxial flexural strength less drastically. With the increasing mass fraction of the anorthite, decreases of the TCE of the material and a small decrease of the density of the LTCC material occur.

Phase Composition, Mechanical and Thermal Properties of (MgO)0.1-x(YO1.5)x(ZrO2)0.9 and (MgO)0.1-x(CaO)x(ZrO2)0.9 Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 751-753
Author(s):  
Chuan Gang Fan ◽  
Lan Xu ◽  
Jie Rong Yan ◽  
Cui Hong Zheng ◽  
Jia Mao Li
Keyword(s):  
Thermal Properties ◽  
Phase Composition ◽  
Flexural Strength ◽  
Bulk Density ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Abrupt Change ◽  
Mechanical And Thermal Properties ◽  
Shock Resistance

(MgO)0.1-x(YO1.5)x(ZrO2)0.9 (MYZ) and (MgO)0.1-x(CaO)x(ZrO2)0.9 (MCZ) ceramics were prepared and their phase composition, bulk density, flexural strength, and thermal shock resistance were characterized. There was an abrupt change of c/(c+m) from 29% to 75% as 0<x<0.01 for MYZ, and a change of c/(c+m) from 42% to 88% appeared as 0.02<x<0.03 for MCZ (the c and m representing the content of the cubic and the monoclinic phases respectively). When x=0.01~0.05, the resulting MYZ specimens had the resembling c/(c+m) at about 75%, and a thermal shock resistance of more than 5 times (1100oC⇔25oC) appeared for x=0.03~0.05 specimens. However for MCZ, only specimen of x=0.01 with c/(c+m) of 33% had a thermal shock resistance more than 5 times.

scholarly journals Physical, mechanical and thermal properties of Crushed Sand Concrete containing Rubber Waste

2018 ◽  
Vol 149 ◽  
pp. 01076
Author(s):  
Guendouz Mohamed ◽  
Boukhelkhal Djamila
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Flexural Strength ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Bulk Density ◽  
Mechanical And Thermal Properties ◽  
The Past ◽  
Rubber Waste ◽  
And Performance

Over the past twenty years, the rubber wastes are an important part of municipal solid waste. This work focuses on the recycling of rubber waste, specifically rubber waste of used shoes discharged into the nature and added in the mass of crushed sand concrete with percentage (10%, 20%, 30% and 40%). The physical (workability, fresh density), mechanical (compressive and flexural strength) and thermal (thermal conductivity) of different crushed sand concrete made are analyzed and compared to the respective controls. The use of rubber waste in crushed sand concrete contributes to reduce the bulk density and performance of sand concrete. Nevertheless, the use of rubber aggregate leads to a significant reduction in thermal conductivity, which improves the thermal insulation of crushed sand concrete.

Influence of B2O3 on Dielectric, Mechanical, and Thermal Properties of MgO-Al2O3-SiO2 Glass-Ceramics

2019 ◽  
Vol 821 ◽  
pp. 435-439
Author(s):  
Bo Li ◽  
Ke Jing ◽  
Hai Bo Bian
Keyword(s):  
Activation Energy ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Low Temperature ◽  
Flexural Strength ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Mechanical And Thermal Properties ◽  
Sintering Process ◽  
Low Thermal Expansion

Low temperature sintered MgO-Al2O3-SiO2 glass-ceramic with high mechanical and low thermal expansion was prepared for package. The remarkable influence of B2O3 addition on the electrical, mechanical, and thermal properties was fully investigated. A small amount of B2O3 promoted the sintering process and improved the densification of MAS. The kinetics via Kissinger method indicated that an appropriate B2O3 content decreased the activation energy and helped the occurrence of crystallization. Due to the increase of crystallinity and indialite phase, B2O3 addition significantly enhanced flexural strength and Young’s modulus. MAS doped with 3wt% B2O3 can be sintered at 900 °C and obtained good properties: σ = 229 MPa, φ = 86 GPa, α = 1.66×10-6 /°C, εr = 5.29, and tanδ = 5.9×10-4.

Mechanical and Thermal Properties of Silicon Nitride Hot Pressed with Adding Rare-Earth Oxides

2005 ◽  
Vol 486-487 ◽  
pp. 181-184 ◽  
Author(s):  
Dae Ho Choi ◽  
Byung Kyu Moon ◽  
Rak Joo Sung ◽  
Seung Ho Kim ◽  
Koichi Niihara
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Flexural Strength ◽  
Grain Growth ◽  
Rare Earth Oxides ◽  
Lattice Oxygen ◽  
Mechanical And Thermal Properties ◽  
Si3n4 Ceramics

Mechanical and thermal properties of Si3N4 ceramics with various rare-earth oxides (La2O3, CeO2, Lu2O3, Dy2O3, Sm2O3, Nd2O3, Yb2O3, and RuO2) were investigated. Flexural strength of silicon nitride with addition of 5vol% Nd2O3, CeO2, Dy2O3, and Sm2O3 showed higher value than that of silicon nitride with Lu2O3 and La2O3 added because they form denser microstructure and smaller elongated grain. Thermal conductivity of silicon nitride with an addition of 5vol% RuO2 was more enhanced than that of silicon nitride added with Nd2O3, Sm2O3, and Dy2O3 because the addition of RuO2 depressed grain growth. It is also associated with lattice oxygen governing thermal conductivity of Si3N4 when added rare-earth oxides.

scholarly journals Mechanical and Thermal Properties of Kenaf Fiber Reinforced Polypropylene/Magnesium Hydroxide Composites

2017 ◽  
Vol 12 (2) ◽  
pp. 155892501701200 ◽  
Author(s):  
C. H. Lee ◽  
S. M. Sapuan ◽  
M. R. Hassan
Keyword(s):  
Thermal Properties ◽  
Flexural Strength ◽  
Magnesium Hydroxide ◽  
Tensile Modulus ◽  
Weight Percent ◽  
Onset Temperature ◽  
Mechanical And Thermal Properties ◽  
Kenaf Fiber ◽  
Flame Retardant Properties ◽  
Incremental Addition

This paper presents a study of the mechanical and thermal properties of kenaf fiber (KF) reinforced polypropylene (PP)/magnesium hydroxide (MH) composites. Pure PP samples show low tensile, flexural and flame retardant properties. It was found that KF and MH filler insertion improved the properties of PP composites. The incremental addition of KF fiber between 0 and 20 weight percent in composites results in higher tensile modulus and decomposed mass loss at onset temperature, but lower tensile strength, elongation, flexural strength and onset temperature. Addition of 25 wt% KF produces slightly higher flexural strength. Increasing the volume of MH filler in the composites caused lower strength, tensile modulus and elongation, but higher onset temperature and 2nd peak temperature in thermogravimetric analysis (TGA) testing. Increasing the KF content in the PP matrix resulted in lower mass residue. Increasing the KF content in composites containing MH increased the mass residue at the end of the testing.

scholarly journals Electrical, mechanical and temperature characterization of commercialy available LTCC dielectric materials

2013 ◽  
Vol 67 (4) ◽  
pp. 621-628 ◽  
Author(s):  
Goran Radosavljevic ◽  
Andrea Maric ◽  
Michael Unger ◽  
Nelu Blaz ◽  
Walter Smetana ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Chemical Composition ◽  
Dielectric Materials ◽  
Accurate Information ◽  
Composition Analysis ◽  
Mechanical And Thermal Properties ◽  
Thermal Coefficient ◽  
Technical Documentation ◽  
Successful Design

Presented paper deals with mechanical, electrical and thermal properties of several commercially available materials that are widely used for fabrication of electronic components, sensor systems etc. In the LTCC (Low Temperature Co-fired Technology). Having complete and accurate information of material chemical composition, its electrical and mechanical properties are essential for successful design of various components and/or systems. In many cases, available technical documentation provided by the manufacturers contains less information than designers require for complete pre-design analysis of system behavior in real time environment. Three offently exploited commercialy available dielectric materials provided by Heraeus company (Heraeus CT700, Heraeus CT707 and Heraeus CT800) are investigated. Electrical, mechanical and thermal properties analyses have been conducted in order to determine some of the important material properties. A full chemical composition analysis was performed resulting in determination of materials' chemical composition, followed with determination of relative permittivity value, elasticity modulus and relative thermal coefficient value.

scholarly journals Effect of curing degree on mechanical and thermal properties of 2.5D quartz fiber reinforced boron phenolic composites

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 462-469
Author(s):  
Huadong Fu ◽  
Yan Qin ◽  
Xin He ◽  
Xinyue Meng ◽  
Yiyou Zhong ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Flexural Strength ◽  
Mechanical And Thermal Properties ◽  
Quartz Fiber ◽  
Fiber Reinforced ◽  
Degree Of Cure ◽  
Rate Of Increase ◽  
Previous Weight Loss ◽  
Bending Failure ◽  
Residual Weight

Abstract2.5D quartz fiber reinforced boron phenolic composites with different curing degrees were prepared by different curing temperatures and curing times. The effects of curing degree on the flexural strength and thermal properties of the composites were investigated by mechanical properties test, scanning electron microscope (SEM) and thermogravimetric analysis (TGA). The results show that the flexural strength increases to the increase in the degree of cure, but the rate of increase is non-linear. When the degree of cure is higher than 90%, the flexural strength of the composite is more than 300 MPa and the bending failure mechanism of the composite is analyzed by SEM. The TG test showed that the degree of cure had little effect on the residual weight of the composite at 1000°C, but had a greater effect on the temperature of the previous weight loss.

Thermomechanical Behavior of Multilayer Structures in Microelectronics

1990 ◽  
Vol 112 (1) ◽  
pp. 11-15 ◽  
Author(s):  
I. M. Daniel ◽  
T.-M. Wang ◽  
J. T. Gotro
Keyword(s):  
Thermal Properties ◽  
Elevated Temperature ◽  
Thermomechanical Behavior ◽  
Multilayer Structures ◽  
Mechanical And Thermal Properties ◽  
Stacking Sequence ◽  
Epoxy Material ◽  
Lamination Theory ◽  
Moire Method ◽  
Good Agreement

Linear thermoelastic lamination theory was used to determine the state of residual stresses and warpage in multilayer structures following elevated temperature curing. The inputs necessary are the mechanical and thermal properties of each layer, the stacking sequence of layers, and the irreversible chemical deformation taking place during curing of the polymeric matrix layers. The predictions were verified experimentally with a woven-glass/epoxy material. The basic mechanical and thermal properties and polymerization shrinkage were determined for the unidirectional layer. Subsequently, the warpage was measured for a [06/906] antisymmetric cross-ply laminate by means of the shadow moire´ method. Experimental results were in good agreement with the theoretical prediction.

Synthesis and thermal properties of the nanoand macro-crystalline Bi5FeTi3O15 ceramic materials

2018 ◽  
pp. 29-33 ◽  
Author(s):  
N. A. Lomanova
Keyword(s):  
Phase Transition ◽  
Thermal Properties ◽  
Phase Composition ◽  
Linear Expansion ◽  
Ceramic Materials ◽  
Thermal Coefficient ◽  
Surface Phase ◽  
Aurivillius Phase ◽  
Synthesis Conditions ◽  
Sintering Characteristics

The synthesis conditions' influence on the development, thermal behavior, and sintering characteristics was investigated for the nanoand macro-crystalline Bi5FeTi3O15 ceramic materials which had the structure of the perovskite-like four-layered Aurivillius phase. It was shown that the beginning of grains sintering is consistent with the beginning of the surface phase melting, given that the surface phase composition can be governed by the initial mixture's chemical composition changing. The temperatures of crystallization, phase transition, decomposition, sintering activation were defined, as well as the thermal coefficient of the linear expansion of the produced materials was determined.

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