AlN-based composite ceramic and preparation method thereof
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A composite ceramic and mixed powder technology, applied in the field of ceramics, can solve problems such as poor fracture toughness of AlN
Inactive Publication Date: 2018-02-02
GUANGDONG UNIV OF TECH
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Problems solved by technology
[0003] In order to solve the technical problem of poor fracture toughness of existing AlN ceramics, the purpose of the present invention is to provide an AlN-based composite ceramic with better mechanical properties
Method used
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Embodiment 1
[0028] (1) Using AlN powder (particle size less than 2μm, oxygen content 0.53wt%) as raw material, Y 2 o 3 powder (99.9% pure) and ZrO 2 (tetragonal crystal, particle diameter is 30nm) is additive, is placed in roller mill and mixes; Carry out batching by weight, 91 parts of AlN powders, 4 parts of Y 2 o 3 , 5 parts ZrO 2 .
[0029] During ball milling, ethanol was used as solvent and ZrO 2 The ball is the ball milling medium, the ball material ratio is adjusted to 3:1, and the ball milling time is 24h. After mixing and drying, a well-mixed AlN-Y 2 o 3 -ZrO 2 Mix powder.
[0030] (2) AlN-Y 2 o 3 -ZrO 2 Put the mixed powder into a graphite mold, pre-press (pre-press at 10MPa for 5min at room temperature), and then carry out hot-press sintering under vacuum conditions and an inert gas protection environment; firstly, the temperature is raised to the first The temperature is 1200°C, then continue to raise the temperature to the second temperature of 1600°C at a heatin...
Embodiment 2
[0034] The difference between this embodiment and Example 1 is: in step (1), during batching: 86 parts of AlN powder, 4 parts of Y 2 o 3 , 10 parts ZrO 2 . The rest are basically the same as those in Embodiment 1, and will not be repeated here.
[0035] After testing, the relative density of the AlN-based ceramics implemented in this implementation is 99.5%, the hardness is 10.45GPa, the bending strength is 302.12MPa, and the fracture toughness is 3.02MPa. m 1 / 2 .
Embodiment 3
[0037] The difference between this embodiment and Example 1 is: in step (1), during batching: 84 parts of AlN powder, 4 parts of Y 2 o 3 , 12 parts ZrO 2 . The rest are basically the same as those in Embodiment 1, and will not be repeated here.
[0038] After testing, the relative density of the AlN-based ceramics implemented in this implementation is 99.6%, the hardness is 10.3GPa, the bending strength is 320MPa, and the fracture toughness is 3.20MPa. m 1 / 2 .
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Abstract
The application belongs to the technical field of ceramics and specifically relates to an AlN-based composite ceramic and a preparation method thereof. The AlN-based composite ceramic comprises AlN and an additive, wherein the additive comprises Re2O3 and ZrO2; Re is selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu. In the AlN-based composite ceramic, the densifying of AlN is promoted by introducing the Re2O3; in addition, the ZrO2 is introduced, and ZrN is generated by performing a high-temperature reaction on the ZrO2, so as to intensify the crystal boundaryof the AlN-based composite ceramic. The invention also provides the preparation method of the AlN-based composite ceramic. Hot pressed sintering is performed by taking the AlN as the basic raw material and the Re2O3 as a sintering additive and adding the appropriate amount of nano-sized ZrO2. The AlN-based composite ceramic obtained by the preparation method has comparatively good heat conductivity and breaking tenacity and good mechanical property. Therefore, the AlN-based composite ceramic can be widely applied in various fields of the ceramics, metallurgy, electronics, chemical engineeringand the like.
Description
technical field [0001] The invention belongs to the technical field of ceramics, and in particular relates to an AlN-based composite ceramic and a preparation method thereof. Background technique [0002] AlN ceramics are ceramics with aluminum nitride as the main crystal phase. They have high thermal conductivity, good electrical insulation properties, low thermal expansion coefficient, and high temperature resistance. They are important substrate packaging materials and high temperature structural materials. However, the mechanical properties of AlN ceramics are poor, especially the fracture toughness, which increases the processing difficulty in the actual application process, thus limiting its wide application. Contents of the invention [0003] In order to solve the technical problem of poor fracture toughness of existing AlN ceramics, the purpose of the present invention is to provide an AlN-based composite ceramic with better mechanical properties. [0004] Concret...
Claims
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