Modified nucleating agent and preparation method thereof

An inoculant and modification technology, which is applied in the field of material chemistry, can solve the problems of reducing the comprehensive mechanical properties of CADI of the finished product, affecting the application of CADI large-diameter casting balls, and slow cooling speed of the casting core. High hardness, the effect of improving the mechanical properties of the core

Inactive Publication Date: 2018-06-29
HEFEI KAIER NANOMETER ENERGY & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for large-section ball mill castings with a thickness greater than 100mm, during the casting process, due to the slow cooling rate of the core of the casting and the long crystallization time, there will often be spheroidization recession and graphite spheroid growth due to poor spheroidization. , the reduction of the number of graphite balls, etc., reduces the comprehensive mechanical properties of the finished CADI, especially the impact toughness, and is prone to brittle fracture, which seriously affects the application of CADI large-diameter casting balls

Method used

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  • Modified nucleating agent and preparation method thereof
  • Modified nucleating agent and preparation method thereof
  • Modified nucleating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the preparation of modified inoculant

[0024] (1) Take by weighing 8 kg of inoculant powder whose brand name is KRY-S, and mix the inoculant and 1.4 kg of micron silicon carbide in a SYH type three-dimensional mixer for 3-5 hours at normal temperature to obtain a mixture A;

[0025] (2) At normal temperature, add 600g of nano-silicon carbide to the mixture A, start the three-dimensional mixer and mix for 3-5 hours to obtain the mixture B;

[0026] (3) Use a GHL type high-efficiency wet mixing granulator to make the mixture B into a modified inoculant with a diameter of 0.2mm-0.7mm.

Embodiment 2

[0027] Embodiment 2: the preparation of modified inoculant

[0028] The method is the same as in Example 1, except that the amount of raw materials used is: 8 kg of inoculant, 1.4 kg of micron silicon carbide, and 0.6 kg of nano silicon carbide.

Embodiment 3

[0029] Embodiment 3: the preparation of modified inoculant

[0030] The method is the same as in Example 1, except that the amount of raw materials used is: 8 kg of inoculant, 1.4 kg of micron silicon carbide, and 0.6 kg of nano silicon carbide.

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Abstract

The invention belongs to the technical field of material chemistry, and particularly relates to a modified nucleating agent and a preparation method thereof. The modified nucleating agent is preparedfrom the following raw materials in percentage by mass: 60 to 90 weight percent of nucleating agents, 10 to 20 weight percent of micrometer silicon carbide and 2 to 10 weight percent of nanometer silicon carbide. The modified nucleating agent provided by the invention can increase the nucleation quantity of CADI (Carbonic Austempering Ductile Iron); the spheroidization process is optimized.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a modified inoculant and a preparation method thereof. Background technique [0002] In cement, mining, thermal power generation and other industrial fields, commonly used crushing equipment requires the use of chromium-based wear-resistant materials with high wear resistance. In recent years, due to the reduction of strategic resources, the price of raw materials related to high-carbon ferrochrome has been rising all the way, which has increased the production cost of manufacturing enterprises. In order to help enterprises reduce costs and improve efficiency, the research and development of non-chromium or low-chromium wear-resistant materials is imperative. Carbide-containing austempering ductile iron (abbreviated as CADI) is a new type of ductile iron material derived from austempering ductile iron (abbreviated as ADI). Its metallographic microstructure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10
CPCC21C1/105
Inventor 张芬红黄勇桂劲松徐伟
Owner HEFEI KAIER NANOMETER ENERGY & TECH
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