阅读说明：本技术 一种铸铁用硅-锌-稀土元素-铬孕育剂及其制备方法 (Silicon-zinc-rare earth element-chromium inoculant for cast iron and preparation method thereof ) 是由 陈明 何赛洲 于 2020-06-18 设计创作，主要内容包括：本发明公开了一种铸铁用硅-锌-稀土元素-铬孕育剂,属于铸造技术领域,孕育剂包括如下质量份的原料：质量份为20~60的硅；质量份为15~30的锌；质量份为20~30的铬；质量份为30~40的碳；质量份为1~3的钡；质量份为4~6的铜；质量份为3~7的铝；质量份为10~20的锶；质量份为0.5~1的铈；质量份为0.5~2的锆；质量份为1~5的RE。本发明的孕育剂中结合了硅、锌、铬、RE的结合,使得本发明的孕育剂在实践能够兼具减少白口倾向、又可以起到净化作用、抗衰退能力强的特性。(The invention discloses a silicon-zinc-rare earth element-chromium inoculant for cast iron, belonging to the technical field of casting, and comprising the following raw materials in parts by mass: 20-60 parts by mass of silicon; 15-30 parts by mass of zinc; 20-30 parts by mass of chromium; 30-40 parts by mass of carbon; 1-3 parts by mass of barium; 4-6 parts by mass of copper; 3-7 parts by mass of aluminum; 10-20 parts by mass of strontium; 0.5-1 parts by mass of cerium; 0.5-2 parts by mass of zirconium; 1-5 parts by mass of RE. The inoculant disclosed by the invention combines the combination of silicon, zinc, chromium and RE, so that the inoculant disclosed by the invention has the characteristics of reducing the chilling tendency, playing a purifying role and having strong anti-fading capability in practice.)

1. The silicon-zinc-rare earth element-chromium inoculant for cast iron is characterized by comprising the following raw materials in parts by mass:

20-60 parts by mass of silicon; 15-30 parts by mass of zinc; 20-30 parts by mass of chromium; 30-40 parts by mass of carbon; 1-3 parts by mass of barium; 4-6 parts by mass of copper; 3-7 parts by mass of aluminum; 10-20 parts by mass of strontium; 0.5-1 parts by mass of cerium; 0.5-2 parts by mass of zirconium; 1-5 parts by mass of RE.

2. The silicon-zinc-rare earth element-chromium inoculant for cast iron as claimed in claim 1, wherein the inoculant is a granular particulate material with a particle size of 1-3 mm.

3. The silicon-zinc-rare earth element-chromium inoculant for cast iron as claimed in claim 1, wherein the inoculant further comprises 0.5-0.8 mass parts of phosphorus.

4. The silicon-zinc-rare earth element-chromium inoculant for cast iron as claimed in claim 1, wherein 20-60 parts by mass of silicon in the inoculant is derived from nano silicon carbide, and the particle size of the nano silicon carbide is 50 ± 5 nm.

5. The method for preparing the silicon-zinc-rare earth element-chromium inoculant for cast iron according to any one of claims 1 to 4, wherein the method comprises the following steps:

step one, under an inert environment, respectively weighing 20-60 parts by mass of silicon, 15-30 parts by mass of zinc, 20-30 parts by mass of chromium and 1-5 parts by mass of RE at a normal temperature, and uniformly mixing;

secondly, weighing 30-40 parts by mass of carbon, 1-3 parts by mass of barium, 4-6 parts by mass of copper, 3-7 parts by mass of aluminum, 10-20 parts by mass of strontium, 0.5-1 parts by mass of cerium and 0.5-2 parts by mass of zirconium, mixing the raw materials in a high-temperature environment, and smelting the raw materials for later use after the raw materials are fully melted;

step three, under the inert condition, carrying out high-temperature mixed smelting on the mixed metal of silicon-zinc-rare earth element-chromium in the step one and the mixture smelted in the step two, and carrying out heat preservation after uniform mixed smelting; repeatedly smelting for 3-5 times according to the same smelting conditions after the heat preservation is finished, and cooling to room temperature;

and step four, granulating the mixture which is repeatedly melted uniformly and cooled in the step according to a conventional technology until the particle size is 1-3 mm.

6. The method as claimed in claim 5, wherein the inert atmosphere in the first step and the third step is an inert atmosphere of argon or nitrogen.

7. The preparation method of the silicon-zinc-rare earth element-chromium inoculant for cast iron according to claim 5, wherein the high-temperature environment in the second step is 900-1000 ℃, and the smelting time is 3-4 h.

8. The method for preparing the silicon-zinc-rare earth element-chromium inoculant for cast iron according to claim 5, wherein the high-temperature mixed smelting conditions in the third step are as follows: 1200-1250 ℃; the heat preservation time is 10-15 min.

Technical Field

The invention belongs to the technical field of casting, and particularly relates to a silicon-zinc-rare earth element-chromium inoculant for cast iron and a preparation method thereof.

Background

Inoculants are used less frequently in people's daily life, but there has been almost a hundred years of development history with inoculants. The first discovery of inoculants was in the nineties of the last century, and workers in germany during the first war period surprisingly found that the addition of ferrosilicon to cast iron reduced the chilling tendency of the cast iron, and thus was the initial inoculant.

Along with the development process of the process, the simple and single ferrosilicon inoculant cannot meet the manufacturing requirements of industries in certain fields, and the later development is that different metal elements are added in the cast iron process to change the chilling tendency of cast iron, so that the addition of different metals enriches the types of the inoculant to a certain extent, and the production requirements of the process at that time are met. However, with the increase of industrialization degree, although various inoculants are available on the market, the inoculants which can reduce the chilling tendency, play a role in purification and have strong anti-fading capability are not achieved in practice.

Disclosure of Invention

Aiming at the problems in the prior art, the invention discloses a silicon-zinc-rare earth element-chromium inoculant for cast iron and a preparation method thereof.

The invention is realized by the following steps:

the silicon-zinc-rare earth element-chromium inoculant for cast iron is characterized by comprising the following raw materials in parts by mass: 20-60 parts by mass of silicon; 15-30 parts by mass of zinc; 20-30 parts by mass of chromium; 30-40 parts by mass of carbon; 1-3 parts by mass of barium; 4-6 parts by mass of copper; 3-7 parts by mass of aluminum; 10-20 parts by mass of strontium; 0.5-1 parts by mass of cerium; 0.5-2 parts by mass of zirconium; 1-5 parts by mass of RE.

Further, the inoculant is granular particles, and the particle size of the granules is 1-3 mm.

Further, the inoculant also comprises 0.5-0.8 mass part of phosphorus.

Further, 20-60 parts by mass of silicon in the inoculant is derived from nano silicon carbide, and the particle size of the nano silicon carbide is 50 +/-5 nm.

The invention also discloses a preparation method of the silicon-zinc-rare earth element-chromium inoculant for cast iron, which is characterized by comprising the following steps:

step one, under an inert environment, respectively weighing 20-60 parts by mass of silicon, 15-30 parts by mass of zinc, 20-30 parts by mass of chromium and 1-5 parts by mass of RE at a normal temperature, and uniformly mixing;

secondly, weighing 30-40 parts by mass of carbon, 1-3 parts by mass of barium, 4-6 parts by mass of copper, 3-7 parts by mass of aluminum, 10-20 parts by mass of strontium, 0.5-1 parts by mass of cerium and 0.5-2 parts by mass of zirconium, mixing the raw materials in a high-temperature environment, and smelting the raw materials for later use after the raw materials are fully melted;

step three, under the inert condition, carrying out high-temperature mixed smelting on the mixed metal of silicon-zinc-rare earth element-chromium in the step one and the mixture smelted in the step two, and carrying out heat preservation after uniform mixed smelting; repeatedly smelting for 3-5 times according to the same smelting conditions after the heat preservation is finished, and cooling to room temperature;

and step four, granulating the mixture which is repeatedly melted uniformly and cooled in the step according to a conventional technology until the particle size is 1-3 mm.

Further, the inert atmosphere in the first step and the third step is argon or nitrogen inert gas atmosphere.

Further, the high-temperature environment in the second step is 900-1000 ℃, and the smelting time is 3-4 hours.

Further, the high-temperature mixed smelting conditions in the step two are as follows: 1200-1250 ℃; the heat preservation time is 10-15 min.

The beneficial effects of the invention and the prior art are as follows:

the inoculant disclosed by the invention is added with the combination of elements of Ba, Cu, RE and Al, so that the prepared inoculant is high in inoculation capability due to the combination of the elements, and the chilling tendency can be reduced to a great extent; the added Sr in the invention has the nucleation capability and can further prevent the chilling tendency, wherein the Sr, the Ce and the Ba have stronger anti-fading capability, and the defect of weak anti-fading capability of the inoculant in the prior art is overcome.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention more clear, the present invention is further described in detail by the following examples. It should be noted that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.