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Preparation method of zirconia thermal barrier coating based on roller

A technology of thermal barrier coating and zirconia, applied in the field of machinery, can solve the problems of thermal barrier coating losing thermal insulation effect, the bonding strength of coating and roll base can not reach the coating roll and other problems, so as to reduce the temperature and improve the service life. , the effect of eliminating stress concentration

Active Publication Date: 2014-07-09
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are very few reports on the application of thermal barrier coatings on rolls. Because of the thermal shock during the rolling process, thermal barrier coatings are easily damaged and lose their heat insulation effect. The bonding strength between the roll substrates cannot meet the requirements of the coated rolls when they are working

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The processed straightening rolls of the continuous casting machine made of 9Cr2MoV are modulated, preheated to 860°C, held for two hours, cooled to 740°C, held for four hours, and released from the furnace when the furnace is cooled to about 500°C; the quenching temperature is 1020°C, Keep warm for 30 minutes, cool the oil to room temperature; tempering temperature is 530°C, tempering for two hours, tempering twice.

[0023] The roll was cleaned with acetone, roughened by sandblasting, and then sprayed with argon-protected plasma. The sprayed NiCoCrAlY alloy powder with a mass fraction of Ni: 76.5, Co: 5, Cr: 14, Al: 4, and Y: 0.5 was prepared into A transition layer with a thickness of 0.1mm, followed by atmospheric plasma spraying with 8% yttria-stabilized zirconia powder to prepare a ceramic layer with a thickness of 0.3mm; then laser remelting of the ceramic coating with a laser power of 350w , the defocus amount is 40mm, the scan rate is 2.2mm / s, the spot diameter...

Embodiment 2

[0025] Preheat the processed hot rolling mill roll made of 60SiMnMo to 875°C, hold it for two hours, cool it down to 750°C, hold it for four hours, and cool it to about 500°C; Room temperature; tempering temperature 540°C, tempering for two hours, tempering twice.

[0026] The roll is cleaned with acetone, sand blasted and roughened, and then sprayed with argon protection plasma. The sprayed NiCoCrAlY alloy powder with a mass fraction of Ni: 74, Co: 5.5, Cr: 15, Al: 5, Y: 0.5 is prepared into A transition layer with a thickness of 0.15mm, followed by atmospheric plasma spraying with 8% yttria-stabilized zirconia powder to prepare a ceramic layer with a thickness of 0.35mm; then laser remelting of the ceramic coating with a laser power of 505w , the defocus amount is 50mm, the scan rate is 3mm / s, the spot diameter is 4.5mm, and the laser specific energy is 37.2J / mm 2 , The overlap rate is 30%.

Embodiment 3

[0028] Preheat the processed H13 liquid core high-pressure rolling mill roll to 890°C, hold it for two hours, cool it down to 760°C, hold it for four hours, and cool it to about 500°C to release it; the quenching temperature is 1050°C, hold it for 30 minutes, The oil is cooled to room temperature; tempering temperature is 560°C, tempering for two hours, tempering twice.

[0029] The roll is cleaned with acetone, sand blasted and roughened, and then sprayed with argon protection plasma. The sprayed NiCoCrAlY alloy powder with a mass fraction of Ni: 72, Co: 6, Cr: 16, Al: 5.5, and Y: 0.5 is prepared into A transition layer with a thickness of 0.2mm, followed by atmospheric plasma spraying with 8% yttria-stabilized zirconia powder to prepare a ceramic layer with a thickness of 0.4mm; then laser remelting of the ceramic coating with a laser power of 600w , the defocus amount is 60mm, the scan rate is 3.6mm / s, the spot diameter is 4.5mm, and the laser specific energy is 37J / mm 2 ,...

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Abstract

A preparation method of a zirconia thermal barrier coating based on a roller mainly performs preheating, cleaning, sand blasting roughening treatment of a processed roller; the method comprises the following steps: spraying NiCoCrAlY alloy powder on a roller surface by plasma spraying equipment to form a transition layer with a thickness of 0.1-0.2 mm, performing air plasma spraying by zirconia powder stabilized with yttrium oxide with a mass fraction of 8% to form a ceramic layer with a thickness of 0.3-0.4 mm, and performing remelting processing of the plasma sprayed surface by a 2000-w direct current rapid excitation crossflow-type CO2 laser with a pressure of 0.25 MPa, an adjusted laser power range of 350-600 w, a defocusing amount of 40-60 mm, a scanning speed of 3-8 mm / s, a spot diameter of 4.5 mm, a specific laser energy of 37.2 J / mm2, and an overlapping rate of 30%. The method of the invention effectively reduces the temperature of the roller surface, prolongs the service life of the roller, and improves the production benefit.

Description

technical field [0001] The invention belongs to the technical field of machinery, in particular to a preparation method suitable for roll coating. technical background [0002] When rolling a thick slab with a liquid core at a large reduction, due to the high temperature of the casting slab in the secondary cooling zone (about 1000°C on the surface), the casting speed is low (less than 1m / min), and the reduction The amount is large, and the contact time between the roll surface and the slab for each rolling cycle is nearly 10 seconds, which is 60 times the contact time between the ordinary roll and the high-temperature slab, which leads to severe thermal fatigue on the surface of the roll body and cracks. Under the combined action of stress and mechanical stress, the crack will expand to the depth, causing the roller to be scrapped in a short time. [0003] At present, nano-zirconia thermal barrier coatings are prepared by plasma spraying nano-zirconia (ZrO2-8%Y2O3) agglome...

Claims

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Application Information

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IPC IPC(8): C23C4/14C23C4/18C23C4/10C23C4/073C23C4/11C23C4/134
CPCY02T50/60
Inventor 孙登月董玉杰张军营侯广义
Owner YANSHAN UNIV
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