Composites of aluminum alloy and magnesium alloy with graphite showing low thermal expansion and high specific thermal conductivity

Composites are special material which can provide individual properties such as high strength with low density or good thermal conductivity with low thermal expansion coefficient. Composites conform to the constantly evolving and more complex expectations. In order to make a product with good quality, it is important to choose suitable materials and technology. In this research powder metallurgy (PM), as one of the most common composite manufacturing technology, was examined -which factors and mechanisms influence mostly the properties of the product. Ishikawa method was used to reveal these correlations.

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Aluminum-Matrix Aluminum Nitride Particle Composite as a Low-Thermal-Expansion Thermal Conductor

MRS Proceedings ◽

10.1557/proc-323-207 ◽

1993 ◽

Vol 323 ◽

Author(s):

Shy-Wen Lai ◽

D. D. L. Chung

Keyword(s):

Thermal Conductivity ◽

Tensile Strength ◽

Thermal Expansion ◽

Volume Fraction ◽

Liquid Aluminum ◽

Aluminum Matrix ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Low Thermal Expansion ◽

Increasing Temperature

AbstractAluminum-matrix composites containing AIN or SiC particles were fabricated by vacuum infiltration of liquid aluminum into a porous particulate preform under an argon pressure of up to 41 MPa. Al/AIN was superior to Al/SiC in thermal conductivity. At 59 vol.% AIN, Al/AlN had a thermal conductivity of 157 W/m. °C and a thermal expansion coefficient of 9.8 × 10−-6°C−1 (35–100 °C). Al/AlN had similar tensile strength and higher ductility compared to Al/SiC of a similar reinforcement volume fraction at room temperature, but exhibited higher tensile strength and higher ductility at 300–400°C. The ductility of Al/AlN increased with increasing temperature from 22 to 400°C, while that of Al/SiC did not change with temperature. The superior high temperature resistance of Al/AlN is attributed to the lack of a reaction between Al and AIN, in contrast to the reaction between Al and SiC in AI/SiC.

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High thermal conductivity and low thermal expansion coefficient of isotropic graphite-reinforced aluminum matrix composites prepared by in situ curing of silicon aerogel

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-020-03465-w ◽

2020 ◽

Vol 31 (12) ◽

pp. 9250-9259 ◽

Cited By ~ 1

Author(s):

Xuanyi Peng ◽

Huang Ying ◽

Xu Sun ◽

Xiaopeng Han ◽

Rui Fan ◽

...

Keyword(s):

Thermal Conductivity ◽

Thermal Expansion ◽

Thermal Expansion Coefficient ◽

Expansion Coefficient ◽

Aluminum Matrix ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Low Thermal Expansion ◽

Isotropic Graphite

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The synthesis, sintering, and thermal properties of (Ca1−x, Mgx)Zr4(PO4)6 (CMZP) ceramics

Journal of Materials Research ◽

10.1557/jmr.1993.2954 ◽

1993 ◽

Vol 8 (11) ◽

pp. 2954-2967 ◽

Cited By ~ 11

Author(s):

T.K. Li ◽

D.A. Hirschfeld ◽

S. VanAken ◽

Y. Yang ◽

J.J. Brown

Keyword(s):

Thermal Conductivity ◽

Thermal Stability ◽

Thermal Expansion ◽

Single Phase ◽

Sol Gel ◽

Synthesis Method ◽

Powder Synthesis ◽

Sintering Aid ◽

Thermal Expansion Anisotropy ◽

Low Thermal Expansion

(Ca1−x, Mgx)Zr4(PO4)6 (CMZP) ceramics have been made by sol-gel and solid state reaction methods. Single phase (Ca1−x, Mgx)Zr4(PO4)6 (x = 0.4) has been obtained. The densification of CMZP depends on the powder synthesis method. Near theoretical density can be achieved by cold pressing and sintering with the addition of a sintering aid. Bulk thermal expansion of CMZP is shown to depend on the phase composition, grain size, and presence of microcracks. By choosing different sintering temperatures and times, the thermal expansion of CMZP can be controlled. CMZP (x = 0.4) ceramics exhibit near zero bulk thermal expansion, low thermal expansion anisotropy, low thermal conductivity, and thermal stability up to 1500 °C.

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Bolt Load Loss Behavior of Magnesium Alloy AZ91D Bolted Joints Clamped with Aluminum Alloy A5056 Bolt

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.313-314.135 ◽

2013 ◽

Vol 313-314 ◽

pp. 135-139

Author(s):

Supamard Sujatanond ◽

Yukio Miyashita ◽

Shinji Hashimura ◽

Yoshiharu Mutoh ◽

Yuichi Otsuka

Keyword(s):

Plastic Deformation ◽

Thermal Expansion ◽

Aluminum Alloy ◽

Magnesium Alloy ◽

Friction Condition ◽

Bolted Joints ◽

Bolted Joint ◽

Az91d Magnesium Alloy ◽

Alloy Az91d ◽

Scm435 Steel

The bolt load loss behavior of AZ91D magnesium alloy bolted joints with a conventional SCM435 steel bolt and an A5056 aluminum bolt was investigated at elevated temperature. The A5056 bolt could reduce the bolt load loss compared to the SCM435 bolt due to smaller mismatch of thermal expansion between the bolt material and the plates. The mismatch of thermal expansion between bolt material and AZ91D plates was found to induce the compressive creep deformation in the AZ91D plates which performed as the main mechanism of bolt load loss. At higher tightening stress, the bolt load loss could be intensified by additional plastic deformation in bolt occurred during the test. Moreover, it is suggested that the plastic deformation could be reduced by decreasing the friction condition in the bolted joint.

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