Hydration-resistant magnesite-calcium refractory material and preparation method thereof

A refractory material, magnesium-calcium technology, applied in the field of hydration-resistant magnesium-calcium refractory materials and its preparation, can solve problems such as affecting product quality, loss of hydration resistance, and easy damage to organic coatings, so as to improve water resistance Chemical performance, beneficial to industrial production and application, and prolonging the service life

Inactive Publication Date: 2017-10-24
长兴泓矿炉料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent with application number 201610954863.1 discloses a hydration-resistant magnesia-calcium sand and its preparation method. Silicone resin is continuously sprayed on the surface of magnesia-calcium sand particles. , but during use, the organic coating is easily damaged and loses its ability to resist hydration
Phosphate compounds will produce phosphorus-containing impurities during use, which will affect product quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Select sintered magnesia-calcium sand with a particle size of 3 mm, put it into the vacuum chamber of a vacuum ion coating machine, and use DC reactive magnetron co-sputtering. The independent metal aluminum is used as the target, and the independent DC power supply is used for power supply, Ar is used as the glow gas, O 2 as a reactive gas. When the back vacuum is better than 2×10 -3 After Pa, clean with Ar plasma bombardment for 15 min in the sputtering chamber. Control Ar / O 2 =120 / 30 (flow ratio), total pressure 0.4Pa, target-base distance 100mm, base bias voltage -80V. The aluminum target was deposited for 30 min under the condition that the sputtering power of the aluminum target was 6000 W.

Embodiment 2

[0021] Select sintered magnesia-calcium sand with a particle size of 2 mm, put it into the vacuum chamber of a vacuum ion coating machine, and use DC reactive magnetron co-sputtering. The independent metal aluminum is used as the target, and the independent DC power supply is used for power supply, Ar is used as the glow gas, O 2 as a reactive gas. When the back vacuum is better than 7×10 -3 After Pa, clean with Ar plasma bombardment for 15 min in the sputtering chamber. Control Ar / O 2 =50 / 30 (flow ratio), total pressure 1.5Pa, target-base distance 50mm, base bias voltage -80V. The aluminum target was deposited for 90 min under the condition that the sputtering power of the aluminum target was 230W.

Embodiment 3

[0023] Select sintered magnesia-calcium sand with a particle size of 12 mm, put it into the vacuum chamber of a vacuum ion coating machine, and use DC reactive magnetron co-sputtering. The independent metal aluminum is used as the target, and the independent DC power supply is used for power supply, Ar is used as the glow gas, O 2 as a reactive gas. When the back vacuum is better than 7×10 -3 After Pa, clean with Ar plasma bombardment for 15 min in the sputtering chamber. Control Ar / O 2 =100 / 30 (flow ratio), total pressure 1.5Pa, target-base distance 50mm, base bias voltage -80V. The aluminum target was deposited for 60 min under the condition that the sputtering power of the aluminum target was 400 W.

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Abstract

The invention relates to a hydration-resistant magnesite-calcium refractory material. The magnesia-calcium based refractory material is characterized in that a granular magnesite-calcium refractory material is used as a raw material, a layer of compact aluminum oxide film covers a surface of the magnesite-calcium refractory material through a physical vapor deposition method; by the film layer, contact between CaO freed in the magnesite-calcium refractory material and external moisture can be effectively isolated, thereby obviously improving the hydration-resistant performance of the magnesite-calcium refractory material. According to the material, the active CaO in the magnesite-calcium refractory material can be well preserved, and the damage to molten steel purification performance of the magnesite-calcium refractory material is avoided; meanwhile, an aluminum oxide component of the surface of the material has the advantages of low cost, little pollution, high-temperature resistance and low damage possibility; moreover, the service life of the material is prolonged, and the production cost is greatly reduced. A used coating method is already a very technologically-mature commonly-used coating technique; the process is stable and simple to control, the coating thickness, the coating density or a coating material are very convenient to regulat and control, and industrial production application is facilitated.

Description

technical field [0001] The invention relates to a magnesium-calcium refractory material and a preparation method thereof, in particular to a hydration-resistant magnesium-calcium refractory material used in the metallurgical industry and a preparation method thereof. Background technique [0002] With the development of the iron and steel industry and the increase in demand for clean steel, the steelmaking technology is increasingly advanced and clean, the smelting conditions are becoming increasingly harsh, and the quality requirements for refractory materials are getting higher and higher, and the cleanliness of steel and refractory materials The material, variety, quality, and use are closely related. Ordinary refractory materials will more or less cause certain pollution to molten steel, which is not suitable for the requirements of clean steel smelting, but magnesium-calcium refractory materials not only do not pollute molten steel, but also have the function of purifyi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B41/87
CPCC04B35/66C04B41/009C04B41/5031C04B41/87C04B2235/3206C04B2235/3208
Inventor 佘建锋
Owner 长兴泓矿炉料有限公司
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