阅读说明：本技术 一种硅碳钙孕育剂及其制备方法 (Silicon-carbon-calcium inoculant 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：本发明公开了一种硅碳钙孕育剂,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30~50的硅；质量份为25~40的碳；质量份为0.2~3的锰；质量份为0.4~2.6的铝；质量份为1~8的钙；质量份为15~30的铁；质量份为0.5~1的增碳剂；所述的质量份为0.2~3的锰；质量份为0.4~2.6的铝；质量份为1~8的钙的成分来源于金属锰,金属铝,金属钙；所述的质量份为25~40的碳的成分来源于高纯石墨；质量份为30~50的硅以及质量份为15~30的铁成分均来源于硅铁合金；本发明的孕育添加剂添加量低的情况下消除或减轻白口倾向,可以使得铸铁过程中避免出现过冷组织,使铸铁中石墨的形态主要是细小而且均匀分布的A型石墨,从而改善铸铁的力学性能。(The invention discloses a silicon-carbon-calcium inoculant, which belongs to the technical field of casting, and comprises the following raw materials in parts by mass: 30-50 parts by mass of silicon; 25-40 parts by mass of carbon; 0.2-3 parts by mass of manganese; 0.4-2.6 parts by mass of aluminum; 1-8 parts by mass of calcium; 15-30 parts by mass of iron; 0.5-1 parts by mass of a carburant; the mass part is 0.2-3 parts of manganese; 0.4-2.6 parts by mass of aluminum; 1-8 parts by mass of calcium are derived from metal manganese, metal aluminum and metal calcium; the carbon with the mass part of 25-40 is derived from high-purity graphite; 30-50 parts by mass of silicon and 15-30 parts by mass of iron are both derived from ferrosilicon alloy; the inoculation additive eliminates or reduces the chilling tendency under the condition of low addition amount, can avoid the appearance of a super-cooled structure in the cast iron process, and ensures that the form of graphite in the cast iron is mainly fine and evenly distributed A-type graphite, thereby improving the mechanical property of the cast iron.)

1. The silicon-carbon-calcium inoculant is characterized by comprising the following raw materials in parts by mass:

30-50 parts by mass of silicon; 25-40 parts by mass of carbon; 0.2-3 parts by mass of manganese; 0.4-2.6 parts by mass of aluminum; 1-8 parts by mass of calcium; 15-30 parts by mass of iron; 0.5-1 parts by mass of a carburant;

the mass part is 0.2-3 parts of manganese; 0.4-2.6 parts by mass of aluminum; 1-8 parts by mass of calcium are derived from metal manganese, metal aluminum and metal calcium;

the carbon with the mass part of 25-40 is derived from high-purity graphite;

the silicon in the amount of 30-50 parts by mass and the iron in the amount of 15-30 parts by mass are both derived from a ferrosilicon alloy.

2. The silicon-carbon-calcium inoculant as claimed in claim 1, wherein the iron element is derived from ferroferric oxide.

3. The silicon-carbon-calcium inoculant as claimed in claim 1, wherein metal components of barium, copper and tin are further added into the inoculant, the mass parts of barium, copper and tin are 0-2, and the mass ratio of barium, copper and tin is 1:1: 2.

4. The silicon-carbon-calcium inoculant as claimed in claim 1, wherein the inoculant is prepared by the following method:

the method comprises the following steps: setting manganese with the mass part of 0.2-3 in an inert atmosphere in a medium-frequency electric furnace; 0.4-2.6 parts by mass of aluminum; 1-8 parts by mass of calcium, heating and smelting, wherein the smelting temperature is 1400 ℃ and 1500 ℃, and the smelted alloy is prepared into spherical particles;

step two: adding high-purity graphite into the spherical granular molten alloy, continuously heating and smelting at the smelting temperature of 1400 ℃ for 1500 ℃, and smelting to a uniform molten state of the raw materials;

step three: adding ferrosilicon alloy or continuing to add ferroferric oxide into the uniform molten liquid prepared in the step two, heating and smelting to obtain a uniform silicon-carbon-calcium inoculant raw material;

step four: and (4) cooling the uniform silicon-barium inoculant alloy raw material in the third step, and cooling to finish the preparation.

5. The silicon-carbon-calcium inoculant according to claim 4, wherein the inert atmosphere is argon; the medium-frequency electric furnace is a 0.5T medium-frequency electric furnace; the cooling was by cooling in liquid nitrogen.

6. The silicon-carbon-calcium inoculant as claimed in claim 4, wherein the spherical granular alloy has a particle size of 0.1-0.3 mm; the particle size of the inoculant is 0.5-0.7 mm.

Technical Field

The invention belongs to the technical field of casting, and particularly relates to a silicon-carbon-calcium inoculant and a preparation method thereof.

Background

In the field of casting technology, the chilling tendency is always a technical problem in the field, and the chilling tendency refers to white iron in cast iron, and the performance of the product is reflected in hardness, brittleness and poor practicability.

Although inoculants are produced on the market to solve the problem of the chilling tendency, the anti-fading capability in the cast iron process is not improved. Other improved inoculants are subsequently available on the market, but all have a small tendency to reduce white cast and still have a supercooled structure during casting; the problem of the wall thickness sensitivity of iron castings is prominent, and therefore the mechanical properties of cast iron are poor.

In summary, it is expected by those skilled in the art that the white cast phenomenon is reduced during the iron casting process, and the morphology and distribution state of graphite during the iron casting process are improved to obtain a novel inoculant with good mechanical properties.

Disclosure of Invention

Aiming at the problems in the prior art, the invention discloses a silicon-carbon-calcium inoculant, which is characterized in that 30-50 parts by mass of silicon, 25-40 parts by mass of carbon and 1-8 parts by mass of calcium are added into raw materials for preparing the inoculant for combined use, so that the phenomenon of 'white iron' can be well inhibited; and the addition of other elements makes the cast iron beneficial to the nucleation of eutectic clusters, increases the number of the eutectic clusters and improves the mechanical property of the cast iron.

The invention is realized by the following steps:

the silicon-carbon-calcium inoculant comprises the following raw materials in parts by mass: 30-50 parts by mass of silicon; 25-40 parts by mass of carbon; 0.2-3 parts by mass of manganese; 0.4-2.6 parts by mass of aluminum; 1-8 parts by mass of calcium; 15-30 parts by mass of iron; 0.5-1 parts by mass of a carburant; the mass part is 0.2-3 parts of manganese; 0.4-2.6 parts by mass of aluminum; 1-8 parts by mass of calcium are derived from metal manganese, metal aluminum and metal calcium; the carbon with the mass part of 25-40 is derived from high-purity graphite; the silicon in the amount of 30-50 parts by mass and the iron in the amount of 15-30 parts by mass are both derived from a ferrosilicon alloy.

Furthermore, the iron element can also be from ferroferric oxide.

Further, metal components of barium, copper and tin are added into the inoculant, the mass parts of the barium, the copper and the tin are 0-2, and the mass ratio of the barium, the copper and the tin is 1:1: 2.

The invention also discloses a silicon-carbon-calcium inoculant, and the preparation method of the inoculant comprises the following steps:

the method comprises the following steps: setting manganese with the mass part of 0.2-3 in an inert atmosphere in a medium-frequency electric furnace; 0.4-2.6 parts by mass of aluminum; 1-8 parts by mass of calcium, heating and smelting, wherein the smelting temperature is 1400 ℃ and 1500 ℃, and the smelted alloy is prepared into spherical particles;

step two: adding high-purity graphite into the spherical granular molten alloy, continuously heating and smelting at the smelting temperature of 1400 ℃ for 1500 ℃, and smelting to a uniform molten state of the raw materials;

step three: adding ferrosilicon alloy or continuing to add ferroferric oxide into the uniform molten liquid prepared in the step two, heating and smelting to obtain a uniform silicon-carbon-calcium inoculant raw material;

step four: and (4) cooling the uniform silicon-barium inoculant alloy raw material in the third step, and cooling to finish the preparation.

Further, the method comprises the following steps of; the medium-frequency electric furnace is cooled in liquid nitrogen in a 0.5T medium-frequency electric furnace cooling mode.

Further, the particle size of the spherical granular alloy is 0.1-0.3 mm; the particle size of the inoculant is 0.5-0.7 mm.

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

1) according to the invention, 30-50 parts by mass of silicon, 25-40 parts by mass of carbon and 1-8 parts by mass of calcium or ferroferric oxide are added to increase the eutectic number of nuclei, so that the chilling tendency can be eliminated or reduced under the condition of low addition of the inoculation additive;

2) according to the inoculant disclosed by the invention, the undercooling structure can be avoided in the cast iron process by compounding the metal components of barium, copper and tin in the raw materials, so that the form of graphite in the cast iron is mainly fine and uniformly distributed A-type graphite, and the mechanical property of the cast iron is improved;

3) in the process of preparing the inoculant, the inoculant is rapidly cooled in a liquid nitrogen environment, so that grain refinement is facilitated, the rare earth metals are matched, the inoculation time is long, the effect is good, and the inoculation efficiency is improved.

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.