High-temperature-resistant high-strength artificial spherical ceramsite sand for large castings and preparation method ofceramsite sand

A technology of large-scale castings and ceramsite sand, which is applied to casting molding equipment, cores, casting molds, etc., can solve the problems of high energy consumption, unsatisfactory refractoriness, and unfavorable improvement of energy efficiency, etc., to improve high-temperature mechanical properties , Improving the high temperature slag resistance performance and improving the air permeability of the mold

Pending Publication Date: 2021-02-09
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The traditional production is prepared by arc melting method, which consumes a lot of energy, which is not conducive to improving energy efficiency and building an energy-saving society. For: CN107840653A);
[0006] 2. Spherical sand is mainly concentrated in aluminum-silico

Method used

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  • High-temperature-resistant high-strength artificial spherical ceramsite sand for large castings and preparation method ofceramsite sand

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation method of the high-temperature-resistant high-strength artificial spherical ceramsite sand used for large-scale castings comprises the following steps:

[0041] S1. Weigh raw materials by mass percentage: magnesite powder 80g, bauxite raw meal powder 20g, MgO content in magnesite powder is 47%wt, Al in bauxite raw meal powder 2 o 3 The content is 74.3%wt; then, add iron oxide powder with a total weight of 2g to the raw material, magnesite powder, bauxite raw meal powder and iron oxide powder through a 300-mesh sieve (that is, the particle size is less than 0.054mm) , put the mixed material into the mixer and fully mix the ingredients for 30 minutes to prepare the ingredients. The iron oxide powder is iron oxide with high purity for industrial use, and its content is 99%wt. Through the process of mixing materials, the fine powder raw materials release their surface static electricity and stress, which is convenient for subsequent steps to make balls;

...

Embodiment 2

[0055] The preparation method of the high-temperature-resistant high-strength artificial spherical ceramsite sand used for large-scale castings comprises the following steps:

[0056] S1. Weigh raw materials according to mass percentage: magnesite powder 85g, bauxite raw meal powder 15g, MgO content in magnesite powder is 47%wt, Al in bauxite raw meal powder 2 o 3 The content is 74.3%wt; then, add iron oxide powder with a total weight of 2g to the raw material, magnesite powder, bauxite raw meal powder and iron oxide powder through a 300-mesh sieve (that is, the particle size is less than 0.054mm) , put the mixed material into the mixer and fully mix the ingredients for 30 minutes to prepare the ingredients. The iron oxide powder is iron oxide with high purity for industrial use, and its content is 99%wt. Through the process of mixing materials, the fine powder raw materials release their surface static electricity and stress, which is convenient for subsequent steps to make ...

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Abstract

The invention relates to high-temperature-resistant high-strength artificial spherical ceramsite sand for large castings and a preparation method of the ceramsite sand, and belongs to the technical field of high-temperature large alloy casting. Bauxite raw material powder and magnesite powder are used as main raw materials, and after component design and regulation, a proper amount of binder is added, mixing, wet grinding, drying and crushing are performed, a mixture is prepared into a ball material through a ball making machine and sintered at the temperature at 1,500-1,550 DEG C for 4-6 hours to prepare the complex-phase high-temperature-resistant artificial spherical ceramsite sand of which the main phase is a periclase phase and a magnesium aluminate spinel phase. The artificial ceramsite spherical sand prepared by the invention has the characteristics of low production cost, high temperature resistance, high strength, low thermal expansion coefficient, low density, high temperature corrosion resistance, wear resistance, metal permeation resistance and strong sand burning capacity, and is suitable for molding binders such as water glass, resin, bentonite and the like; and theceramsite sand can be used for casting large high-temperature alloy thick and large hot spot parts such as precision casting, lost foam casting and V-method casting.

Description

technical field [0001] The invention belongs to the technical field of high-temperature large-scale alloy casting, and specifically relates to a high-temperature-resistant high-strength artificial spherical ceramsite sand for large-scale castings and a preparation method thereof. Background technique [0002] Artificial ceramsite sand is a granular refractory material used as molding sand and core sand in foundry production. At present, in the production of large-scale high-temperature alloy castings, due to the long thermal interaction time between the alloy liquid and the molding sand, mechanical permeability and interactive sand sticking often occur on the interface, which deteriorates the surface quality of the casting. At present, there are two main types of foundry sand used in the production of large castings: one is natural ore sand, and the other is artificial ceramsite sand. Natural ore sand includes zircon sand, chromite sand, magnesia, olivine sand and other non...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/04B22C9/10B22C9/02
CPCC04B35/66C04B35/04B22C9/10B22C9/02C04B2235/3217C04B2235/3208C04B2235/3272C04B2235/3418C04B2235/5427C04B2235/5436C04B2235/606C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/9607
Inventor 王晓军秦梅田玉明玄松桐白频波李占刚
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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