Electrical properties and thermal expansion of cordierite
Cordierite has low dielectric constant ε=5–6 high resistivity ρ>10 12 Ωcm elevated thermal and chemical stabilities and very low thermal expansion coefficient α=1–2 10 −6 °C −1 2 5 6 These properties together with low processing costs characterise cordierite as a potentially available material to be used in replacement
Get Price
Electrical properties and thermal expansion of cordierite
Cordierite has low dielectric constant ε =5–6 high resistivity ρ >10 12 Ωcm elevated thermal and chemical stabilities and very low thermal expansion coefficient α =1–2 10 −6 °C −1 2 5 6 These properties together with low processing costs characterise cordierite as a potentially available material to be used in replacement of the alumina substrates traditionally employed in the electronic industry 1 2 3 However cordierite has the disadvantage of its very low average thermal expansion coefficient with respect to Si chip where microcircuits that carry out the logic and memory functions are built 2 Moreover cordierite
Get Price
Low Thermal Expansion Ceramic Mirrors Fine Ceramics
Low Thermal Expansion Ceramic Mirrors Highly rigid and extremely thin with reduced weight By utilizing dense cordierite with a low thermal expansion coefficient deformation due to temperature change is suppressed Due to the thin shape enabled by the high rigidity and the complicated rib structures weight can be reduced to
Get Price
Crystal Structure and Thermal Expansion Coefficient of
Cordierite honeycomb ceramics are sintered under a range of sintering atmosphere and temperature conditions The linear thermal expansion coefficient CTE is measured along the extrusion direction The samples sintered in an enclosed crucible have
Get Price
Thermal expansion mechanism of cordierite with titanium or
A unique feature of cordierite is the negative thermal expansion of its c axis while the a and b axes show positive thermal expansion behavior The thermal expansion mechanism of cordierite has been investigated in many theoretical studies but the effect of Ti or
Get Price
Structural origin of negative thermal expansion of
Cordierite Mg2 Al 3 Si 5 O 18 2MgO 2Al 2 O 3 5SiO 2 ceramic is a typical low thermal expansion material The coefficient of thermal expansion CTE is in the range of 1˜3 10 −6 K −1 25–800 °C and varies with the composition and manufacturing process 1 2 3
Get Price
Thermal expansion of cordierite Room temperature to 1000
The thermal expansion of hexagonal cordierite was measured between room temperature and 1000/sup 0/C with a diffractometer an internal cap alpha Al/sub 2/O/sub 3
Get Price
Preparation and Anisotropic Lattice Thermal Expansion of
The hexagonal cordierite was synthesized by the reverse coprecipitation calcination method and characterized by powder X ray diffraction The lattice thermal expansion behavior of hexagonal cordierite was investigated by high temperature X ray diffraction in the temperature range K The lattice parameters of the hexagonal cordierite at different temperature were calculated by a least
Get Price
Processing and characterization of pure cordierite and
The flexural strength of composite was found to increase from 126 46 to 297 62 MPa The thermal expansion coefficients of cordierite and cordierite–zirconia 20 wt were 4 08 10−6 and 4 42 10−6◦C−1which may be due to the addition of zirconia
Get Price
Thermal Expansion of High Cordierite and Its Solid Solutions
High cordierite Mg 2 Al 4 Si 5 O 18 and its solid solutions containing Fe Mn Ga or Ge were synthesized and axial thermal expansions of those crystals were measured by means of high temperature X ray powder diffraction Each isomorphous substitution caused characteristic modification of axial thermal expansions and it was revealed that the expansion anisotropy and/or expansion
Get Price
Thermal Expansion of CordieriteMILBERG1977Journal
Thermal Expansion of Cordierite M E MILBERG The writers are with the Ceramics Optics Glass Department Ford Motor Company Dearborn Michigan 48121 Member the American Ceramic Society Search for more papers by this author H D BLAIR
Get Price
Thermal Expansion Physico Mechanical Properties and
Densification properties microstructure and the thermal expansion coefficient of the fired samples were determined The refractoriness under load and compressive strength was determined It was concluded that cordierite is the only crystalline phase recorded in the two batches
Get Price
Thermal expansion mechanism of cordierite with titanium or
A unique feature of cordierite is the negative thermal expansion of its c axis while the a and b axes show positive thermal expansion behavior The thermal expansion mechanism of cordierite has been investigated in many theoretical studies but the effect of
Get Price
Mechanisms of ultralow and anisotropic thermal expansion
In this work first principle calculations were performed to investigate the thermal expansion behavior in cordierite Mg 2 Al 4 Si 5 O 18 which is a representative silicate widely used in the ceramic industry and of promising application due to its ultralow CTE and good thermal shock resistance
Get Price
Synthesis of Cordierite with Low Thermal Expansion
Cordierite is an excellent material with good thermal shock resistance and used at high temperature for its low thermal expansion coefficient Cordierite ceramics were prepared by using talc alumina and kaolin clay as starting materials The thermal expansion coefficient phase composition and microstructure were studied and the results showed that in order to get samples with low thermal
Get Price
Thermal expansion mechanism of cordierite with titanium or
A unique feature of cordierite is the negative thermal expansion of its c axis while the a and b axes show positive thermal expansion behavior The thermal expansion mechanism of cordierite has been investigated in many theoretical studies but the effect of
Get PriceThe microstructure coefficient of thermal expansion and
Cordierite ceramics were produced from alumina with 5 and 0 65 μm particle sizes or AlOOH and talc clays and feldspar to determine the influence of the alumina particle size on the microstructure coefficient of thermal expansion CTE and flexural strength FS of the ceramics
Get Price
DEVELOPMENT OF LOW THERMAL EXPANSION GLAZE
A cordierite body with a low thermal expansion coefficient of 1 /oC has excellent thermal shock resistance and can be used for manufacturing stove top ceramic cookware This study is aimed at developing a glaze for a cordierite body having a thermal expansion coefficient less than 3 09 10 6/oC The glazes in a Li 2O KNaO CaO MgO Al
Get Price
Thermal expansion of anhydrous Mg cordierite between 25
Thermal expansion measurements on synthetic orthorhombic Mg cordierite low cordierite Mg 2 Al 4 Si 5 O 18 were carried out with a high temperature X ray Guinier camera The measurements confirm previous studies reporting low thermal expansion and suggesting a closer relationship with ring rather than framework silicates
Get Price
HC 11100 Reacted CordieritHamgil
HC 11 is used for making low expansion highly refractory kiln furniture such as setters saggers and car tops The low thermal expansion less than 1 x 10 6 °C of HC 11 results in ceramic shapes that withstand repeated rapid thermal cycling in fast fire kilns
Get Price
Fabrication and Characterization of Low Thermal Expansion
Cordierite and spodumene composite has been interested for ceramic cookware due to their fitted properties In previous work study in the cordierite spodumene composite with low thermal expansion coefficient of 2 60 x 10 6 /°C when sintered at 1250 oC with a ratio of spodumene 60 wt and cordierite 40 wt can withstand the pot shape samples
Get PriceProcessing and characterization of pure cordierite and
plasticizers 10 Cordierite–titania synthesized from talc and clay produced materials with reduced thermal expansion 11 Gel cast forming method using tert butyl alcohol improved the low temperature sintering of the cordierite powder 12 Cordierite formation was observed at low sintering tempe rature 1300 C with the addition of TiO 2 dopant
Get Price
thermalWelcome at Sembach Technical Ceramics
Cordierite low thermal expansion The thermal expansion of technical ceramics is normally lower than that of grey cast iron or steela detail that needs to be considered when designing composite constructions Thermal expansion is a specific material constant with values depending on the respective temperature range
Get Price
Thermal expansion of anhydrous Mg cordierite between 25
Thermal expansion measurements on synthetic orthorhombic Mg cordierite low cordierite Mg2Al4Si5O18 were carried out with a high temperature X ray Guinier camera The measurements confirm previous studies reporting low thermal expansion and suggesting a closer relationship with ring rather than framework silicates No indication for structural modifications correlated with symmetry
Get Price
Mechanical And Thermal Properties Of Copper Cordierite
In this work thermal conductivity of cordierite was 0 83 W/m k increased to 2 34 W/m k for cordierite matrix containing 40 wt Cu as reinforcements heat treated at 800 C for 2 hours since with increases copper content the pores closed that enable ceramic to transfer heat and increasing thermal conductivity 13
Get PriceEffect of Microstructure on the Thermal Expansion
As a result the mean thermal expansion coefficient of the cordierite ceramics decreased to 0 4 10 −6 K −1 from the average value of the crystal axes of 1 7 10 −6 K −1 This lower thermal expansion coefficient could be theoretically explained by partial microcracking
Get PriceMechanisms of ultralow and anisotropic thermal expansion
In this work first principle calculations were performed to investigate the thermal expansion behavior in cordierite Mg 2 Al 4 Si 5 O 18 which is a representative silicate widely used in the ceramic industry and of promising application due to its ultralow CTE and good thermal shock resistance
Get Price
Microstructure thermal expansion hardness and
Cordierite is well known for its very low thermal expansion however CTE of cordierite ceramics may depend on the nature and amount of phases that coexist with cordierite in the final product
Get Price
Cordierite
CORDIERITE Cordierite is an extremely low thermal expan sion ceramic which was developed over two decades back and we have been constantly improving on its characteristics since CHARACTERISTICS Minimal temperature deformation due to dense cordierite ceramic with an extremely low thermal expansion rate Approx 70 weight reduction
Get Price
Thermal Expansion of CordieriteMILBERG1977Journal
Thermal Expansion of Cordierite M E MILBERG The writers are with the Ceramics Optics Glass Department Ford Motor Company Dearborn Michigan 48121 Member the American Ceramic Society Search for more papers by this author H D BLAIR
Get PriceThermal expansion with temperature dependent CTE
Thermal expansion with temperature dependent CTE I want to model the thermal expansion of a structure made of two different materials whose coefficient of thermal expansion CTE depends on temperature To do so I defined two piecewise functions CTE inside each material in Materials > Material name > Basic with a single argument T
Get PriceThermal Expansion of Cordierite Journal of the American
Thermal Expansion of Cordierite Thermal Expansion of Cordierite MILBERG M E BLAIR H D 00 00 00 The magnetically dependent variation of the output voltage appears to be the result of interaction between the Rayleigh wave and Bloch wall motion in the Ni Zn ferrite 8 Studies on theoretical explanations are now in progress
Get Price
