Zirconia coating saggar used for sintering of electronic components and preparation method thereof

Abstract

The invention discloses a zirconia coating saggar used for sintering of electronic components. The saggar includes an alumina matrix and a zirconia coating. The alumina matrix includes, by weight, thefollowing components: 10%-30% of fused white corundum with a coarse particle size of 0.2-0.5 mm, 10%-30% of fused mullite with a particle size of 0.1-0.2 mm, 10%-30% of fused mullite fine powder with200 meshes, 10%-20% of highly pure alumina micro-powder, and 0.1%-1% of an organic bonding agent. The zirconia coating includes, by weight, the following components: 10%-30% of yttrium oxide stabilized zirconia powder with 80 meshes, 10%-30% of calcium oxide stabilized zirconia powder with 150 meshes, 10%-30% of yttrium oxide stabilized zirconia powder with 150 meshes, and 10%-30% of yttrium oxide stabilized zirconia powder with 325 meshes. The invention also relates to a preparation method of the zirconia coating saggar used for the sintering of the electronic components; and equipment for spraying a zirconia coating adopts the most advanced atmospheric plasma spraying equipment in the country, so that the prepared zirconia coating is dense and peeling off-resistant, and the service lifeof the coating is prolonged.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a zirconia-coated sagger for sintering electronic components and a preparation method thereof. Background technique [0002] Zirconia has the advantages of large refractive index, high melting point, and strong corrosion resistance, so it is generally used for firing saggers. Zirconia has three crystal forms: monoclinic, tetragonal, and cubic. The oblique phase appears, and it turns into a tetragonal phase when it is heated to about 1100°C, and it turns into a cubic phase when heated to a higher temperature. Since a large volume change occurs when the monoclinic phase transforms to the tetragonal phase, and a large volume change occurs in the opposite direction when cooled, it is easy to cause cracking of the product, which limits the application of pure zirconia in high temperature fields. . However, after adding a stabilizer, the tetragonal phase can be stabilized at room ...

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Problems solved by technology

Since a large volume change occurs when the monoclinic phase transforms to the tetragonal phase, and a large volume change occurs in the opposite direction when cooling, it is easy to cause cracking of the product, which limits the application of pure zirconia in the high temperature field.