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CN-121992332-A - Coating for ceramic furnace roller with cold and hot alternating working conditions and spraying method of coating

CN121992332ACN 121992332 ACN121992332 ACN 121992332ACN-121992332-A

Abstract

The invention discloses a coating for a ceramic furnace roller under cold and hot alternative working conditions and a spraying method thereof, and belongs to the technical field of material processing. The coating sequentially comprises an LCO-17 bottom layer and an LCO-56 surface layer from the furnace roller shaft center to the outside. The spraying method comprises the steps of 1, preprocessing, namely cleaning a roller body of a furnace, 2, spraying LCO-17 powder on the surface of the roller body through plasma spraying equipment at the temperature of 200 ℃ and within to form an LCO-17 bottom layer, 3, curing, namely drying, preserving heat and completely curing the bottom layer, 4, spraying LCO-56 powder on the surface of the bottom layer through plasma spraying equipment at the temperature of 200 ℃ and within to form an LCO-56 surface layer, 5, post-processing, namely naturally cooling and polishing the roller surface. The invention can realize smooth transition of hardness, prolong the service life of the furnace roller and further reduce the production cost.

Inventors

  • LI JIAWEI
  • Zhao Qishao
  • ZHAO HUIJIANG

Assignees

  • 张家港扬子江冷轧板有限公司
  • 江苏沙钢集团有限公司
  • 江苏省沙钢钢铁研究院有限公司

Dates

Publication Date
20260508
Application Date
20260109

Claims (10)

  1. 1. A coating for a ceramic furnace roller under a cold-hot alternating working condition is characterized by sequentially comprising an LCO-17 bottom layer and an LCO-56 surface layer from the furnace roller shaft center to the outside.
  2. 2. The coating of a ceramic furnace roller for cold and hot alternating conditions according to claim 1, wherein the thickness of the LCO-17 underlayer is 80-100 μm.
  3. 3. The coating of claim 1, wherein the LCO-56 top layer has a thickness of 120-150 μm.
  4. 4. The coating of a ceramic furnace roller for cold and hot alternating conditions according to claim 1, wherein the furnace roller is used at the junction of a soaking section and a cooling section of a common plate furnace zone.
  5. 5. A method of spraying a coating on a ceramic burner roll for alternating cold and hot conditions as set forth in claim 1, comprising the steps of: Step 1, preprocessing, namely cleaning a furnace roller body and removing greasy dirt and an oxidation layer; Spraying LCO-17 powder on the surface of the roller body at 200 ℃ or below by using plasma spraying equipment to form an LCO-17 bottom layer; step 3, curing treatment, namely drying and preserving heat of the bottom layer, and completely curing; Spraying LCO-56 powder on the surface of the bottom layer by using plasma spraying equipment at the temperature of 200 ℃ and below to form an LCO-56 surface layer; and 5, post-treatment, namely polishing the roller surface after natural cooling.
  6. 6. A method for spraying a coating on a ceramic furnace roller under alternating cold and hot conditions according to claim 5, wherein in the step 1, the pretreatment is finished according to the standard that the surface roughness Ra of the furnace roller is less than or equal to 5 μm.
  7. 7. The method for spraying the coating on the ceramic furnace roller for the cold-hot alternating working condition according to claim 5, wherein in the step2, parameters of the plasma spraying equipment are set to be 380-420A in current, 80-85V in voltage, 120-150mm in spraying distance and 5-8mm/s in moving speed.
  8. 8. The method for spraying the coating on the ceramic furnace roller under the cold-hot alternating working condition according to claim 5, wherein in the step 3, the drying temperature is 200-220 ℃ and the heat preservation time is 2-3h.
  9. 9. The method for spraying the coating on the ceramic furnace roller under the cold-hot alternating working condition according to claim 5, wherein in the step 4, parameters of the plasma spraying equipment are set to be 400-450A in current, 85-90V in voltage, 110-130mm in spraying distance and 6-9mm/s in moving speed.
  10. 10. The method for spraying the coating on the ceramic furnace roller for the cold-hot alternating working condition according to claim 5, wherein in the step 5, the post-treatment is finished according to the standard that the roundness error of the roller surface is less than or equal to 0.05mm and the surface roughness Ra is less than or equal to 3 μm.

Description

Coating for ceramic furnace roller with cold and hot alternating working conditions and spraying method of coating Technical Field The invention belongs to the technical field of material processing, and particularly relates to a coating of a ceramic furnace roller for cold-hot alternate working conditions and a spraying method thereof. Background In the heat treatment link of the common plate production, the passage rollers (such as roller numbers 43A/43B) at the junction of the soaking section and the slow cooling section are in severe working conditions for a long time, and are required to bear severe temperature change of strip steel from 780-850 ℃ high temperature to 480-520 ℃ low temperature. Currently, the surface of the passageway roller is made of ceramic, and a conventional spraying process adopts single LCO-56 material, so that the roller body hardness (HV 320-350) and the coating hardness (HV 800) are obviously different, and the hardness transition is steep. The unreasonable hardness matching leads the roller surface coating to be easy to fall off in a high-temperature environment, thereby causing the defects of roller surface nodulation, pitting and the like, and the defects are transferred to the surface of the strip steel, so that the quality problems of strip steel pits, roller marks and the like are caused. In order to avoid the product quality not reaching the standard, enterprises need to replace aisle rollers once a month or frequently arrange manual polishing maintenance, so that the replacement cost is up to 66 ten thousand yuan (calculated according to 5.5 ten thousand yuan, 2 aisle/time and 6-8 aisle replacement) in one year, the equipment downtime is increased, the production efficiency is reduced, and the problem is not solved effectively for a long time. Similarly, other ceramic furnace rollers (such as transition rollers of stainless steel production lines) in cold-hot alternating conditions also have the problems. Disclosure of Invention Aiming at the technical problems, the invention provides a coating for a ceramic furnace roller under cold and hot alternate working conditions and a spraying method thereof, which can realize smooth transition of hardness, prolong the service life of the furnace roller and further reduce the production cost. The technical scheme is that the coating of the ceramic furnace roller for cold and hot alternate working conditions sequentially comprises an LCO-17 bottom layer and an LCO-56 surface layer from the furnace roller shaft center to the outside. Preferably, the LCO-17 underlayer has a thickness of 80-100 μm. Preferably, the LCO-56 top layer has a thickness of 120-150 μm. Preferably, the furnace roller is used at the junction of a soaking section and a cooling section of the common plate furnace zone. A spraying method for a coating of a ceramic furnace roller under cold-hot alternating working conditions comprises the following steps: Step 1, preprocessing, namely cleaning a furnace roller body and removing greasy dirt and an oxidation layer; Spraying LCO-17 powder on the surface of the roller body at 200 ℃ or below by using plasma spraying equipment to form an LCO-17 bottom layer; step 3, curing treatment, namely drying and preserving heat of the bottom layer, and completely curing; Spraying LCO-56 powder on the surface of the bottom layer by using plasma spraying equipment at the temperature of 200 ℃ and below to form an LCO-56 surface layer; and 5, post-treatment, namely polishing the roller surface after natural cooling. Preferably, in the step 1, the pretreatment is completed according to the standard that the surface roughness Ra of the furnace roller is less than or equal to 5 mu m. Preferably, in the step 2, parameters of the plasma spraying equipment are set to be 380-420A in current, 80-85V in voltage, 120-150mm in spraying distance and 5-8mm/s in moving speed. Preferably, in the step 3, the drying temperature is 200-220 ℃ and the heat preservation time is 2-3h. Preferably, in the step 4, parameters of the plasma spraying device are set to be 400-450A in current, 85-90V in voltage, 110-130mm in spraying distance and 6-9mm/s in moving speed. Preferably, in the step 5, the post-treatment is finished according to the standard that the roundness error of the roller surface is less than or equal to 0.05mm and the surface roughness Ra is less than or equal to 3 mu m. The invention has the beneficial effects that a double-layer spraying structure of a bottom layer and a surface layer is adopted, wherein the bottom layer is sprayed, namely, a layer of LCO-17 material is sprayed on the surface of a passageway roller body made of ceramic materials to form a transitional bottom layer, the hardness of the transitional bottom layer is between the roller body hardness (HV 320-350) and the surface layer hardness (HV 800), the abrupt hardness change can be eliminated, and the surface layer is sprayed, namely, after the bottom layer LCO-17 is compl