CN115678321A - Method for reducing cracking of refractory material prefabricated part - Google Patents
Method for reducing cracking of refractory material prefabricated part Download PDFInfo
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- CN115678321A CN115678321A CN202211243498.5A CN202211243498A CN115678321A CN 115678321 A CN115678321 A CN 115678321A CN 202211243498 A CN202211243498 A CN 202211243498A CN 115678321 A CN115678321 A CN 115678321A
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Abstract
The invention discloses a method for reducing cracking of a refractory material prefabricated part, which comprises the steps of spraying organic coating after demolding to seal an opening air hole on the surface of the prefabricated part and controlling the volatilization speed of water on the surface of the prefabricated part, so that uniform drying is kept, and cracking and deformation phenomena generated when the refractory material prefabricated part is baked are reduced; after the coating prepared by the invention is sprayed on the surface of the refractory material prefabricated part, the surface roughness of the prefabricated part can be reduced, the high temperature resistance is improved, the binding force among all components of the coating is improved, the permeability of the coating is improved, the coating can better permeate the prefabricated part and seal air holes, and the prefabricated part is not easy to crack under high-temperature baking.
Description
Technical Field
The invention relates to the technical field of refractory material prefabricated parts, in particular to a method for reducing cracking of a refractory material prefabricated part.
Background
The refractory material is limited by the use environment in the use process, a plurality of products with complex shapes are produced, and the products are difficult to prepare by mechanical pressing or vibration pressing, the casting prefabricated member is a good method for solving the problem, the casting prefabricated member combines the shape diversity characteristic of an unshaped product and the characteristic of excellent performance of a formed product, the performance of the casting prefabricated member is better than that of an unshaped refractory material, the casting prefabricated member has more flexibility than that of a shaped product, and the use requirement of special-shaped parts of a kiln can be met. The main process of casting the prefabricated member comprises the steps of manufacturing a mould, forming, maintaining, baking and demoulding, and during the processes of airing, maintaining and baking, because the moisture evaporation is inconsistent, the temperature gradient is easy to cause internal stress, the prefabricated member product is cracked and distorted, particularly, the cracking probability of the large or complex-shaped prefabricated member is higher, the whole furnace prefabricated member is cracked seriously and scrapped when the cracking probability is serious, and the yield of the prefabricated member product is reduced.
In the prior art, the cracking of the prefabricated member is reduced by mainly adopting methods of prolonging the airing and maintaining time of the prefabricated member, reducing the baking speed, burying powder to control baking and heat transfer and the like, but the method has the defects of complicated working procedures, prolonged production period, reduced production efficiency and influence on the quality and on-schedule delivery of products.
Disclosure of Invention
The invention aims to provide a method for reducing cracking of a prefabricated part of a refractory material, which is characterized in that an organic coating is sprayed to close an opening pore on the surface of the prefabricated part after demoulding, and the volatilization speed of water on the surface of the prefabricated part is controlled, so that the prefabricated part is uniformly dried, cracking and deformation phenomena generated during baking of the prefabricated part of the refractory material are reduced, the problems that the conventional prefabricated part of the refractory material is easy to crack and deform in the manufacturing process are solved, and the yield, the yield and the economic benefit of a prefabricated part product are improved.
The technical scheme adopted by the invention for realizing the purpose is as follows: a method of reducing cracking of a refractory preform, comprising the steps of:
step one, preparing the coating
The raw material components and the added mass percentage are as follows: adding 30-45% of alpha-Al by the total weight of the solution into an aqueous solution containing 0.5-1% of polyacrylamide 2 O 3 Mixing the micro powder and 0.5-1% of dispersant, stirring thoroughly for 10-15 minutes, and preparing into coating;
step two, spraying and drying
After the prefabricated member is demoulded, the coating prepared in the step one is evenly sprayed on the surface of the prefabricated member, the thickness is 0.5mm, and then the prefabricated member is dried according to the normal baking process of the prefabricated member.
The dispersant is one or more of melamine cyclamate formaldehyde, polyacrylate, naphthalenesulfonate, sodium hexametaphosphate, sodium carbonate, sodium silicate and sodium tripolyphosphate.
The organic coating prepared by the invention is sprayed on the surface of the demolded refractory material prefabricated part, and then the surface is baked, so that the organic coating can better permeate into the prefabricated part, the high-temperature resistance strength is high, the coating belongs to an organic chemical high polymer material, and a formed coating film belongs to a high polymer compound type.
The polyacrylamide is a linear organic high-molecular polymer, is easy to dissolve in water, can quickly produce uniform slurry, is convenient for prefabricating the slurry in the coating process, can effectively achieve the required thickening effect by a mixing system, can adsorb suspended particles in the water, plays a role of bridging among the particles, enables fine particles to form larger floccules, has good suspension property, prevents the phenomenon of coating sagging, can establish thick-layer coating, plays roles of preventing sinking, thickening and sagging, has good operation performance, can quickly adjust the rheological property and the viscosity of the slurry, and is easy to use.
Wherein the activity is bimodal alpha-Al 2 O 3 The micro powder has small grain size and filling effect, can reduce the water requirement of the coating, increase the forming density and strength of the coating and promote the sintering of the prefabricated part.
In the preparation process of the coating, the uniform dispersion of the coating slurry is directly related to the spraying, the appearance, the coating performance and the like of the coating, the dispersion quality of the coating slurry is related to the light of the dispersing agent, and the formulation of the coating formula and the selection of raw materials are related. Organic and inorganic dispersants are adopted to reasonably disperse various particles in a solvent, and various particles are stably suspended in the solvent through a certain charge repulsion principle or a high molecular steric effect.
The invention has the beneficial effects that: after the coating prepared by the invention is sprayed on the surface of the refractory material prefabricated part, the surface roughness of the prefabricated part can be reduced, the high temperature resistance is improved, the binding force among all components of the coating is improved, the permeability of the coating is improved, the coating can better permeate the prefabricated part and seal air holes, and the prefabricated part is not easy to crack under high-temperature baking.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
Example 1:
adding 30 percent of alpha-Al by the total weight of the solution into a 0.5 percent aqueous solution containing polyacrylamide 2 O 3 The micro powder and 0.5 percent of melamine cyclamate formaldehyde are fully stirred for 10 minutes to prepare the coating, the coating is evenly sprayed on the surface of the prefabricated part after the prefabricated part is demoulded, the thickness is 0.5mm, and then the prefabricated part is dried according to the normal baking process.
Example 2:
adding alpha-Al accounting for 45 percent of the total weight of the solution into a 1 percent aqueous solution containing polyacrylamide 2 O 3 And (3) fully stirring the micro powder and 1% of sodium hexametaphosphate and sodium tripolyphosphate composite dispersant for 15 minutes to prepare a coating, demolding the prefabricated part, uniformly spraying the coating on the surface of the prefabricated part with the thickness of 0.5mm, and drying the prefabricated part according to a normal baking process.
Example 3:
adding alpha-Al accounting for 40 percent of the total weight of the solution into a water solution containing 0.8 percent of polyacrylamide 2 O 3 And (3) fully stirring the micro powder and 0.8% of polyacrylate for 12 minutes to prepare a coating, demolding the prefabricated part, uniformly spraying the coating on the surface of the prefabricated part with the thickness of 0.5mm, and drying the prefabricated part according to a normal baking process.
Claims (3)
1. A method of reducing cracking of a refractory preform, comprising the steps of:
step one, preparing the coating
The raw material components and the added mass percentage are as follows: adding 30-45% of alpha-Al by the total weight of the solution into an aqueous solution containing 0.5-1% of polyacrylamide 2 O 3 Mixing the micro powder and 0.5-1% of dispersant, stirring thoroughly for 10-15 minutes, and preparing into coating;
step two, spraying and drying
After the prefabricated member is demoulded, the coating prepared in the step one is evenly sprayed on the surface of the prefabricated member, and then the prefabricated member is dried according to the normal baking process of the prefabricated member.
2. The method of claim 1, wherein the dispersant is one or more of melamine cyclamate formaldehyde, polyacrylate, naphthalene sulfonate, sodium hexametaphosphate, sodium carbonate, sodium silicate and sodium tripolyphosphate.
3. The method of claim 1, wherein the thickness of the surface coating of the preform in step two is 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211243498.5A CN115678321A (en) | 2022-10-12 | 2022-10-12 | Method for reducing cracking of refractory material prefabricated part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211243498.5A CN115678321A (en) | 2022-10-12 | 2022-10-12 | Method for reducing cracking of refractory material prefabricated part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115678321A true CN115678321A (en) | 2023-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211243498.5A Pending CN115678321A (en) | 2022-10-12 | 2022-10-12 | Method for reducing cracking of refractory material prefabricated part |
Country Status (1)
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| CN (1) | CN115678321A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313261A (en) * | 2001-04-27 | 2001-09-19 | 项新惠 | Refractory for cupola furnace |
| CN105778684A (en) * | 2016-03-21 | 2016-07-20 | 苏州天键衡电子信息科技有限公司 | High-temperature-resistant coating for ships |
| CN109294414A (en) * | 2018-10-25 | 2019-02-01 | 合肥隆扬环保科技有限公司 | A kind of phase-changing energy-storing temperature control interior wall coating and preparation method thereof |
-
2022
- 2022-10-12 CN CN202211243498.5A patent/CN115678321A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313261A (en) * | 2001-04-27 | 2001-09-19 | 项新惠 | Refractory for cupola furnace |
| CN105778684A (en) * | 2016-03-21 | 2016-07-20 | 苏州天键衡电子信息科技有限公司 | High-temperature-resistant coating for ships |
| CN109294414A (en) * | 2018-10-25 | 2019-02-01 | 合肥隆扬环保科技有限公司 | A kind of phase-changing energy-storing temperature control interior wall coating and preparation method thereof |
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