Composite material of electroconductor having controlled coefficient of thermical expansion
A technology of thermal expansion coefficient and ceramics, which is applied in the field of conductive composite materials with controlled thermal expansion coefficient, can solve the problems of low fracture resistance, uneven material, mechanical properties (rigidity and resistance are not high enough to improve) Mechanical properties, the effect of excellent mechanical properties
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Embodiment 1
[0054] The starting materials are:
[0055] a) has the composition LiAlSiO 4 ( figure 1 The LAS powder of composition A) has an average particle size of 1 μm and a density of 2.39 g / cm 3 .
[0056] b) carbon nanofibers with a diameter of about 20-80 nm and a density of 1.97 g / cm 3 .
[0057] c) Absolute ethanol (99.97% pure).
[0058] 700 g of LAS was used, dispersed in 1400 g of ethanol. This was then mixed with a suspension of 146.4 g of carbon nanofibers in 2000 g of ethanol. The combination was homogenized by mechanical stirring for 60 minutes and then ground in a pulverizer for a further 60 minutes by operating at 300 rpm. The suspension thus prepared was dried by atomization to obtain nanocomposite particles, while ethanol was recovered by the process described. The milling stage enables the preparation of a homogeneous and nano-sized powder, which improves the thickening of the final material.
[0059] The dry product thus obtained was subjected to a forming an...
Embodiment 2
[0064] The starting materials are:
[0065] a) has composition 2Al 2 o 3 ·5SiO2 2 2MgO cordierite powder with a density of 2.65 g / cm 3 .
[0066] b) carbon nanofibers with a diameter of about 20-80 nm and a density of 1.97 g / cm 3 .
[0067] c) Absolute ethanol (99.97% pure).
[0068] 900 g cordierite was used, which was dispersed in 1600 g ethanol. Then, it was mixed with a suspension of 21 g of carbon nanofibers in 400 g of ethanol. The combination was homogenized by mechanical stirring for 60 minutes and then ground in a pulverizer for a further 60 minutes by operating at 300 rpm. The suspension thus prepared was dried by atomization to obtain nanocomposite particles, while ethanol was recovered by the process described.
[0069] The dried product was subjected to a forming process using cold isostatic pressing at 200 MPa. A shaped material was obtained which was sintered at 1400° C. in an argon atmosphere in a conventional oven with a dwell of 120 minutes and a he...
Embodiment 3
[0074] The starting materials are:
[0075] a) has the composition LiAlSiO 4 ( figure 1 Composition in) LAS powder, its average particle size is 1μm, density is 2.39g / cm 3 .
[0076] b) carbon nanofibers with a diameter of about 20-80 nm and a density of 1.97 g / cm 3 .
[0077] c) SiC powder with an average particle size of less than 100 nm and a density of 3.20 g / cm 3 .
[0078] d) Absolute ethanol (99.97% pure).
[0079]600 g of LAS was used, dispersed in 1300 g of ethanol. This was then mixed with a suspension of 63 g of carbon nanofibers in 1100 g of ethanol and a suspension of 143.8 g of n-SiC in 1000 g of ethanol. The combination was homogenized by mechanical stirring for 60 minutes and then ground in a pulverizer for a further 60 minutes by operating at 300 rpm. The suspension thus prepared was dried by atomization to obtain nanocomposite particles, while ethanol was recovered by the process described.
[0080] The dry product thus obtained was subjected to a f...
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