Metallized ceramic furnace nozzle material for intermediate frequency furnace and preparation method of metalized ceramic furnace nozzle material

Abstract

The invention discloses a metalized ceramic furnace nozzle material for an intermediate frequency furnace and a preparation method of the metalized ceramic furnace nozzle material. The metalized ceramic furnace nozzle material comprises powder and a dispersing agent accounting for 0.05-0.2 wt% of the powder, the powder material comprises the following components in percentage by weight: 60-70% of alumina powder; 20 to 30 wt% of electrolytic chromium powder; 0.5 to 3 wt% of magnesium oxide powder; 1-5 wt% of silicon dioxide; 3 to 8 wt% of aluminum dihydrogen phosphate; and 0.5-3 wt% of calcium oxide powder. The metalized ceramic furnace nozzle material for the intermediate frequency furnace and the preparation method of the metalized ceramic furnace nozzle material have the advantages of being good in constructability, good in compression molding, low in sintering temperature, good in heat resistance and thermal shock resistance, high in breaking strength, not prone to shrinkage cracking and the like, long in service life and capable of avoiding frequent damage, repair and replacement of a furnace nozzle of the intermediate frequency furnace and improving the service life of the furnace nozzle. The accident risk is reduced; and the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of refractory materials for intermediate frequency induction furnaces, and in particular to a metallized ceramic nozzle material for intermediate frequency furnaces and a preparation method thereof. Background Art

[0002] Intermediate frequency induction furnaces are commonly used high-temperature smelting equipment in the steel industry and the casting industry, and have the characteristics of fast heating rate, intermittent operation, convenient operation, low pollution, high efficiency and energy saving. The nozzle of the intermediate frequency furnace is one of the components of the intermediate frequency furnace and is used for pouring molten steel. During the smelting of the intermediate frequency furnace, the temperature of special molten steel reaches 1650 °C. When the molten steel flows through the nozzle of the intermediate frequency furnace, it causes high-temperature erosion and thermal shock to the nozzle, the material falls off, the molten steel splashes, and even causes personal accidents.

[0003] At present, the nozzle of the intermediate frequency furnace is made by hand ramming refractory materials added with sodium silicate. Since the requirements of sintering cannot be fully met, the refractoriness and erosion resistance are difficult to guarantee, the service life is extremely short, and the refractory material of the nozzle often falls off, causing the molten steel to flow bifurcate and splash. It seriously does not meet the safety requirements, and there are potential safety hazards and service life problems. Summary of the Invention

[0004] In order to overcome the deficiencies in the background art, the present invention discloses a metallized ceramic nozzle material for an intermediate frequency furnace and a preparation method thereof. To achieve the above invention purpose, the present invention adopts the following technical solutions: A metallized ceramic nozzle material for an intermediate frequency furnace, characterized in that: it comprises powder materials and a dispersant accounting for 0.05-0.2 wt% of the powder materials; the powder materials include: 60-70 wt% of alumina powder; 20-30 wt% of electrolytic chromium powder: 0.5-3 wt% of magnesium oxide powder; 1-5 wt% of silicon dioxide: 3-8 wt% of aluminum dihydrogen phosphate; 0.5-3 wt% of calcium oxide powder; the preparation method of the metallized ceramic nozzle material for the intermediate frequency furnace is: weighing and proportioning the above powder materials and the dispersant, grinding, stirring and mixing evenly, and dry pressing to form a blank; the blank is first subjected to preheating treatment; after the preheating treatment, it enters a sintering furnace and is sintered in an inert gas argon atmosphere, and the product is obtained after cooling.

[0005] Preferably, the alumina Al 2 O 3 content ≥ 95 wt% and the particle size ≤ 10 μm.

[0006] Preferably, the electrolytic chromium powder has a Cr content of 99.5 wt% and the particle size ≤ 1 μm.

[0007] Preferably, the 0.5-3 wt% of magnesium oxide powder has a particle size ≤ 1 μm.

[0008] Preferably, the 1-5 wt% of silicon dioxide has a particle size of 1-10 μm.

[0009] Preferably, the aluminum dihydrogen phosphate particles of 3-8 wt% are 5-20 μm.

[0010] Preferably, the calcium oxide powder particles of 0.5-3 wt% are 1-10 μm.

[0011] Preferably, the preheating treatment is to heat up to 550°C in an argon atmosphere at a heating rate of 1-5°C / min and hold for 3-5 hours at 550°C.

[0012] Preferably, the sintering is to heat from 550°C to 1500°C in an argon atmosphere at a heating rate of 5-10°C / min.

[0013] Preferably, for the preparation method of the intermediate frequency furnace nozzle material, the cooling method after sintering adopts rapid air cooling.

[0014] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: A metallized ceramic nozzle material for an intermediate frequency furnace and its preparation method disclosed by the present invention, the prepared metallized ceramic nozzle for the intermediate frequency furnace has better thermal shock resistance and avoids the phenomenon of molten steel scouring and falling off; The metallized ceramic nozzle for the intermediate frequency furnace prepared by the present invention has good workability, high mechanical strength, good thermal shock stability, avoids molten steel scouring and falling off of the nozzle and molten steel forking and splashing, and improves safety and service life. Description of the Drawings

[0015] Figure 1 It is a flow block diagram of a metallized ceramic nozzle material for an intermediate frequency furnace and its preparation method; Figure 2 It is a usage diagram of the metallized ceramic nozzle material for the intermediate frequency furnace of the present invention; Figure 3 It is a usage diagram of the existing manual refractory intermediate frequency furnace nozzle. Detailed Embodiments

[0016] The present invention can be explained in detail through the following embodiments, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. Embodiment 1

[0017] A metallized ceramic nozzle material for an intermediate frequency furnace and its preparation method, which includes powder materials and a dispersant accounting for 0.05 wt% of the powder materials; the powder materials include: 60 wt% of alumina powder, 22 wt% of electrolytic chromium powder, 3 wt% of magnesia powder, 5 wt% of silica, 8 wt% of aluminum dihydrogen phosphate, and 2 wt% of calcium oxide powder.

[0018] Mix the above component raw materials under an argon atmosphere by grinding and stirring until evenly mixed. After grinding, perform dry pressing to form a shape. After dry pressing, preheat under an argon atmosphere and heat up to 550°C at a heating rate of 1 - 5°C / min, then hold for 3 hours. After the preheating is completed, sinter under an argon atmosphere, raise the temperature from 550°C to 1500°C at a heating rate of 5 - 10°C / min, and after sintering, cool rapidly by air cooling to obtain the product. Example 2

[0019] A metallized ceramic nozzle material for an intermediate frequency furnace and its preparation method, comprising powder materials and a dispersant accounting for 0.15 wt% of the powder materials; the powder materials include: 62 wt% of alumina powder, 24 wt% of electrolytic chromium powder, 2 wt% of magnesium oxide powder, 3 wt% of silicon dioxide, 7 wt% of aluminum dihydrogen phosphate, and 2 wt% of calcium oxide powder.

[0020] Mix the above component raw materials under an argon atmosphere by grinding and stirring until evenly mixed. After grinding, perform dry pressing to form a shape. After dry pressing, preheat under an argon atmosphere and heat up to 550°C at a heating rate of 1 - 5°C / min, then hold for 4 hours. After the preheating is completed, sinter under an argon atmosphere, raise the temperature from 550°C to 1500°C at a heating rate of 5 - 10°C / min, and after sintering, cool rapidly by air cooling to obtain the product. Example 3

[0021] A metallized ceramic nozzle material for an intermediate frequency furnace and its preparation method, comprising powder materials and a dispersant accounting for 0.1 wt% of the powder materials; the powder materials include: 64 wt% of alumina powder, 26 wt% of electrolytic chromium powder, 2 wt% of magnesium oxide powder, 1.5 wt% of silicon dioxide, 5.5 wt% of aluminum dihydrogen phosphate, and 1 wt% of calcium oxide powder.

[0022] Mix the above component raw materials under an argon atmosphere by grinding and stirring until evenly mixed. After grinding, perform dry pressing to form a shape. After dry pressing, preheat under an argon atmosphere and heat up to 550°C at a heating rate of 1 - 5°C / min, then hold for 5 hours. After the preheating is completed, sinter under an argon atmosphere, raise the temperature from 550°C to 1500°C at a heating rate of 5 - 10°C / min, and after sintering, cool rapidly by air cooling to obtain the product.

[0023] Comparative Example 1 An existing manual refractory nozzle for an intermediate frequency furnace.

[0024] Table 1 shows the test performance after using the nozzles of Examples 1 - 3 of the present invention. Compared with the prior art, it can be seen that compared with the existing intermediate frequency furnace nozzle in Comparative Example 1, Examples 1 - 3 of the present invention not only have a thermal shock life that the prior art does not have, but also the mechanical property indexes exceed those of traditional materials.

[0025]

[0026] Table 1 Performance Comparison Table The parts not detailed in the present invention are prior arts. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, aiming to include all changes falling within the meaning and scope of equivalent elements in the present invention.

Claims

1. A metallized ceramic nozzle material for a medium frequency furnace, characterized by: The invention comprises a powder and a dispersant accounting for 0.05-0.2wt% of the powder; the powder comprises: 60-70wt% of aluminum oxide powder; 20-30wt% of electrolytic chromium powder; 0.5-3wt% of magnesium oxide powder; 1-5wt% of silicon dioxide; 3-8wt% of aluminum dihydrogen phosphate; and 0.5-3wt% of calcium oxide powder. The preparation method of the metallized ceramic nozzle material for the medium frequency furnace is as follows: the powder and the dispersant are weighed and mixed in a certain proportion, ground and stirred to mix evenly, and dry-pressed to obtain a blank; the blank is first preheated; after the preheating treatment, it is placed in a sintering furnace and sintered in an inert gas argon atmosphere, and the product is obtained after cooling.

2. The metallized ceramic nozzle material for medium frequency furnace according to claim 1, characterized in that: The aluminum oxide Al2O3 content is ≥95wt%, and the particles are ≤10μm.

3. The metallized ceramic nozzle material for medium frequency furnace according to claim 1, characterized in that: The Cr content of electrolytic chromium powder is ≥99.5wt%, and the particle size is ≤1μm.

4. The method for preparing the metallized ceramic nozzle material for medium frequency furnace according to claim 1, characterized in that: The preheating treatment is to heat the temperature to 550° C. in an argon atmosphere at a heating rate of 1-5° C. / min, and keep the temperature at 550° C. for 3-5 hours.

5. The method for preparing the metallized ceramic nozzle material for medium frequency furnace according to claim 1, characterized in that: The sintering is carried out by heating the temperature from 550°C to 1500°C in an argon atmosphere at a heating rate of 5-10°C / min.

6. The method for preparing the metallized ceramic nozzle material for medium frequency furnace according to claim 1, characterized in that: The cooling method adopts rapid air cooling.

7. The method for preparing the metallized ceramic nozzle material for medium frequency furnace according to claim 1, characterized in that: The grinding is carried out under an argon atmosphere.

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