Preparation method of nanoscale zirconia ceramic powder for spraying

Abstract

The invention provides a preparation method of nanoscale zirconia ceramic powder for spraying. The preparation method provided by the invention comprises the following steps of ingredient ball milling, atomization drying, sieving gradation, dry-pressing molding, sintering compaction, crushing polishing, autogenous grinding trimming, and screening detection. The preparation method provided by the invention has the advantages that nanoscale yttria-stabilized zirconia ceramic powder for spraying is directly prepared by high temperature ceramic preparation and crushing and through high-temperature sintering at a temperature of 1500 to 1600 DEG C in preparation, ZrO2 has a yttria-stabilized zirconia (YSZ) crystal structure or a yttria-partially stabilised zirconia (PYSZ) crystal structure at ahigh temperature, in other word, ZrO2 comprises monoclinic crystals and cubic crystals; the YSZ crystal structure or the PYSZ crystal structure has high strength, high toughness, good wear resistance, good high temperature resistance, good corrosion resistance, high rigidity, no magnetic conductivity and an electrical insulating property; the nanoscale zirconia ceramic powder obtained by the preparation method has density of 6.00g / cm<3>, Moh's hardness of 9, compressive strength of 1170Mpa and good thermal shock resistance; and through granulator-based autogenous grinding trimming, the nanoscale zirconia ceramic powder obtained by the preparation method has volume density of 1.15 to 1.45g / m<2> (min)% and good fluidity.

Description

technical field [0001] The invention relates to a preparation method of nano zirconia ceramic powder for spraying, in particular to a preparation method of nano zirconia ceramic powder for material surface strengthening, wear resistance, corrosion resistance and high temperature resistance thermal spraying. Background technique [0002] Studies have shown that partially yttria-stabilized zirconia powder can make ZrO 2 A stabilized (YSZ) or partially stabilized (PYSZ) crystal structure is obtained at high temperature, which consists of a mixture of monoclinic and cubic crystals. This crystal structure has high strength and high toughness, good wear resistance, high temperature resistance, corrosion resistance, high rigidity, non-magnetic conductivity, and electrical insulation. Its density is 6.00g / cm3, its Mohs hardness can be as high as 9, its compressive strength is 1170 Mpa, and it has better thermal shock resistance. In addition, when used at a high temperature ...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the above-mentioned deficiencies in the prior art, the present invention solves the problem that in the prior art, when the sprayed coating is subjected to thermal cycle conditions, a large thermal stress will be generated, causing the coating to crack and peel off, and it provides a kind of raw material that is easy to obtain, and the equipment Preparation method of nano zirconia ceramic powder for spraying that is not demanding, suitable for large-scale production, and meets the requirements of thermal spraying process

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