Production of compacted iron modifier based on nano-dispersed powders

FIELD: metallurgy.

SUBSTANCE: proposed method comprises mixing of cryolite and the mix of nano-dispersed powder of oxides of niobium, titanium, zirconium, tantalum with mixing agent and further compaction of said mix. Cross-linking agent represents aqueous solution of glyoxal (40%). Note here that obtained pasty mix is compacted by screw pelletiser to cylindrical pellets to be dried for 3 hours at 80°C at the following ratio of components, in wt %: cryolite - 79-81, niobium oxide - 3-4, titanium oxide - 3-4, zirconium oxide - 4-3, tantalum oxide - 1-2, aqueous solution of glyoxal (40%) - 5-7.

EFFECT: higher physical and mechanical properties, decreased amount of cast rejects.

2 ex, 1 tbl, 1 dwg

 

The invention relates to metallurgy, foundry, in particular to the modifiers for the manufacture of cast iron, working in the conditions of abrasive wear.

Known modifier and method thereof (patent RF 2180363 IPC SS 35/00, SS 1/05). The invention relates to a modifier for iron smelting. Proposed modifier containing components in the following ratio, wt.%: silicon 20-55; carbon 20-65 and/or silicon carbide 30-40; calcium 0,5-6,0; iron rest. The modifier may optionally contain one element selected from the group comprising, by wt.%: magnesium 1-3; 1-5 titanium; zirconium 1-5; rare-earth metals 1-5; strontium is not more than 2; barium 2-6. The method of obtaining the modifier includes grinding ferroalloys - ferrosilicon, silicocalcium and carbonaceous additives and blending. After grinding take fractions of ferrous alloys with grain size 0,315-5.0 µm, and carbon-containing additives with grain size 0,315 to 2.0 μm, and after mixing shall briquetting by pressing. The carbonaceous additives use graphite crucible or graphite electrode and silicon carbide. Modifier receive in the form of briquettes in the form of tablets with a diameter of 7-100 mm at a moisture content does not exceed 0.2%. In another embodiment, take only the fine fraction of components with grain size 0,315 to 2.0 μm. The technical result is m invention is the complete assimilation of the modifier iron while reducing the cost of production.

Main disadvantages:

1) you Need fractionation.

2) Briquetting is carried out by pressing.

3) Require carbon-containing additives.

A known method of inoculation of cast irons and steels (patent 2121510 IPC SS 1/00, SS 7/00, SS 35/00). The invention relates to metallurgy, and in particular to methods secondary inoculation of cast irons and steels with ultrafine refractory particles clad with metal protector, and can be used in metallurgy and foundry. The invention allows to simplify and reduce the cost of technology modification, as well as to improve the mechanical and operational properties of iron and steel. According to the method in the melt iron and steel impose a modifier containing dispersed refractory non-metallic particles and the substance-protector. Before introduction into the melt under a stream of molten metal mixture dispersed refractory non-metallic particles and matter-protector processed (simultaneous crushing, activating and plating dispersed refractory non-metallic particles to produce a powder with the size of the dispersed refractory non-metallic particles is not more than 0.1 μm, then the resulting powder is introduced into the molten metal. The powder is a joint grinding refractory dispersed namecalling the x particles and substances protector in the following ratio, wt%: refractory non-metallic particles dispersed 50-90%; substance-protector - rest. The grinding mixture dispersed refractory non-metallic particles and substances protector can be carried out in an inert atmosphere.

Main disadvantages:

1) Should the cladding metal protector.

2) Before introduction into the melt under a stream of molten metal mixture dispersed refractory non-metallic particles and matter-protector processed.

3) Grinding the mixture dispersed refractory non-metallic particles and matter-protector recommended in an inert atmosphere

A method of obtaining a modifier for Nickel alloys (patent 2447177, IPC SS 35/00, B22F 3/12), selected as a prototype. The invention relates to metallurgy, in particular to the formation of powder metallurgy methods briquette for modification of Nickel alloy ultrafine powders of refractory compounds. In a mixture containing powders of molybdenum, chromium and Nickel, introducing ultra-fine powder of titanium carbonitride and powders of titanium, aluminum, tungsten and niobium. The powder of titanium carbonitride pre-stirred for 1.5-2 hours and mixed with titanium powder 10-20 minutes. Add the aluminium powder and stirred for 10-20 minutes, then add the powders of tungsten, niobium, molybdenum, chromium and Nickel are added and stirred for 5-10 minutes. The mixture is subjected to degassing in VA is wumei furnace with a vacuum of 2 to 10 -3-2·10-4mm Hg at a temperature of 250-400°C for 5-15 minutes and stirred for 1.5 to 2.5 hours. Pressed at a pressure of 20-100 MPa and is sintered in vacuum for 30 minutes the Invention allows to reduce the content of gas impurities and enables the formation of fine grains uniformly distributed in the volume of modified alloy. Main disadvantages: for modifier used powders of the metals niobium, titanium, niobium, molybdenum, titanium carbonitride, which increases the cost of the modifier; to get the modifier using vacuum and heat, which increases the complexity of obtaining modifier; for compacting used pressing at a pressure of 20-100 MPa.

The present invention is to develop a way of introduction SIC - and nitridebased elements in the molten cast iron to improve the physico-mechanical characteristics of the alloys and reduce output foundry scrap (shells, pores, cracks).

The problem is solved in that a method of obtaining a compacted modifier iron-based nano-powder materials includes the preparation of a mixture of nanodispersed oxides of rare earth elements (REE) (niobium, titanium, zirconium, tantalum) and cryolite, followed by molding, but unlike the prototype for the comp is sterowanie is carried out by wetting the components of the modifier solution of glyoxal without pressing. To prepare kompaktirovannoi modifier based on nano-powder material is a mixture of oxides of rare-earth elements (niobium, titanium, zirconium, tantalum) and an aqueous solution of glyoxal (40%), in the following ratio, wt.%:

cryolite - 79-81%

the oxide of niobium, 3-4%

the titanium oxide, 3-4%

zirconium oxide 4-5%

the oxide of tantalum - 1-2%

an aqueous solution of glyoxal (40%) - 5-7%.

The resulting mixture was homogenized by stirring, compact into pellets using a laboratory granulator CF-004, which are then dried for 3 h at 80°C.

Preparation of compacted inoculant for cast iron is made in two stages. At the first stage of cryolite and a mixture of nanodispersed oxides of niobium, titanium, zirconium, tantalum mixed with an aqueous solution of glyoxal (40%). Stirring is carried out for 5 minutes, after which the mixture korrektiruete into cylindrical pellets. The obtained compacted modifier is dried for 3 hours at a temperature of 80°C. an example of a specific implementation of the invention given below.

Example 1. A mixture of cryolite in the amount of 81 wt.% and nanodispersed oxides of niobium, titanium, zirconium, tantalum in an amount of 14 wt.% mixed in the mixer periodic action with a 40% solution of glyoxal (5 wt%). The compacting in a cylindrical shape was carried out on the device FS-004. Received modi who icator were dried at a temperature of 80°C for 3 hours. The granules had a white color and are characterized by a tensile strength in bending of 7 kg/see

Example 2. A mixture of cryolite in the amount of 79 wt.% and nanodispersed oxides of niobium, titanium, zirconium, tantalum in an amount of 14 wt.% mixed in the mixer periodic action with a 40% solution of glyoxal (7%). The compacting and drying is carried out as in example 1. The granules had a yellowish color and are characterized by a tensile strength in bending of 12 kg/see

Advantages of the claimed invention are: the use as a binder an aqueous solution of glyoxal (40%), the use of which avoids the operation of pressing to produce solid pellets. Glyoxal when injected into zhelezouglerodistye melt decomposes to form gaseous products, as a result, the modifier becomes highly dispersed state. For the production of modifier used highly dispersed oxides, which ensures a low cost modifier. Figure 1 presents the results of the research output of the foundry marriage when using the compacted modifier when using ferrotitanium for the inoculation of cast iron brand ICHN. (Figure 1 - ratio of the yield of products and foundry scrap in the processing of compacted modifier (2) and ferrotitanium (1)).

Table 1 presents the results of the waves of mechanical properties of cast iron brand ICHN, processed compacted modifier obtained by traditional technology. (Table 1 - properties of cast iron ICHN)

Table 1
DescriptionCast iron obtained by traditional technologyCast iron, compacted processed modifier
tensile strength
(tensile strength) σB, MPa
370390
The hardness of Brinell, HB560590-600

A method of obtaining a compacted modifier iron-based nano-powder materials comprising a mixture of cryolite and a mixture of nanodispersed oxides of niobium, titanium, zirconium, tantalum with a mixing agent and subsequent compacting of the mixture, characterized in that as the mixing agent is used an aqueous solution of glyoxal (40%), with the resulting pasty mixture by means of a screw granulator compact in granules of cylindrical shape, which is dried for 3 hours at a temperature of 80°C, in the following ratio of components of the mixture, wt.%:
cryolite 79-81
the oxide of niobium 3-4
hydroxy is titanium 3-4
zirconium oxide 4-5
the oxide of tantalum 1-2
an aqueous solution of glyoxal (40%) 5-7.



 

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