CN101709437A - Preparation process of grey cast iron based authigenic tantalum carbide composite material - Google Patents
Preparation process of grey cast iron based authigenic tantalum carbide composite material Download PDFInfo
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- CN101709437A CN101709437A CN200910218843A CN200910218843A CN101709437A CN 101709437 A CN101709437 A CN 101709437A CN 200910218843 A CN200910218843 A CN 200910218843A CN 200910218843 A CN200910218843 A CN 200910218843A CN 101709437 A CN101709437 A CN 101709437A
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- cast iron
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Abstract
The invention discloses a preparation process of a grey cast iron based authigenic tantalum carbide composite material, which mainly comprises the following steps of: weaving tantalum wires into a tantalum wire net, and cutting, multilayer rolling or stacking to prepare a netted three-dimensional skeleton structure; manufacturing a casting mould according to casting process requirements, and placing the tantalum wire three-dimensional netted skeleton into a casting mould cavity in advance; smelting grey cast iron, pouring the smelted grey cast iron into the casting mould, and obtaining a tantalum wire-grey cast iron binary material precast body after cooling and cleaning; and placing the tantalum wire-grey cast iron binary material precast body into a heat treatment furnace, heating to carbides to form temperature, and preserving heat to obtain a tantalum carbide grain enhanced grey cast iron based composite material. The composite material prepared by the method fully exerts the high wear resisting performance of a tantalum carbide hard phase and the good toughness of the grey cast iron, has convenient adjustment and control and reliable process, solves the difficult problems of incomplete reaction of the composite material, nonuniform reinforced phase grain distribution, attenuated reinforced phase interface pollution and the like, and can be widely applied to the wear-resistant fields of mines, electric power, metallurgy, coal, building materials and the like.
Description
Technical field
The invention belongs to the metal-base composites technical field, particularly preparation process of grey cast iron based authigenic tantalum carbide composite material.
Background technology
The grey cast iron low price is most widely used a kind of cast iron, generally is used to make parts such as support, wheel casing, valve body, bearing support.But owing to lack hard phase such as carbide in the grey cast iron, its macrohardness is very low, so grey cast iron can not resist under the wear working condition condition, abrasive material is to the cutting abrasion effect of piece surface, this makes grey cast iron be difficult to be applied on the equipment part that is subjected to abrasive wear, has greatly limited its use range.
The compound preparation technology of ceramic particle enhanced has appearred in recent years to improve the wear resistance of grey cast iron, for example be placed on the casting mold bottom with tantalum carbide or titanium nitride particles, and then pour into grey cast iron, but preparation technology is difficult to stable control, the enhanced granule skewness still is difficult to obtain to strengthen the whole wear-resistant grey cast iron that body is evenly distributed.Also have hard particles such as tantalum carbide are shaped with adhesive cures, put into casting mold, then casting of molten metal, make the fusion of interpenetrating of hard particles and molten metal, but produce a large amount of gases because binding agent at high temperature decomposes, cause the many pores of the inner formation of composite bed, effect is undesirable.
Summary of the invention
The purpose of this invention is to provide preparation process of grey cast iron based authigenic tantalum carbide composite material, in the grey cast iron matrix, form netted tantalum carbide hard phase by this technology, and effectively be combined as a whole with grey cast iron, given full play to the high abrasion characteristic of hard phase, the excellent toughness that has also kept matrix metal, thereby reach best Performance Match, can be made into the product of multiple structural shape, development prospect is wide.
Technical scheme of the present invention is achieved in that
(1) with tantalum wire braiding tantalum wire net (1);
(2) with tantalum wire net (1) cutting, multilayer rolls or superpose, and is prefabricated into netted cubic cage;
(3) carry out pickling and remove the greasy dirt foreign material being prefabricated into netted three-dimensional skeleton;
(4) make casting mold by the casting technique requirement;
(5) the three-dimensional skeleton of ready-formed tantalum wire net (1) shape is put into casting mold (2);
(6) smelt grey cast iron (3), obtain liquid grey cast iron;
(7) liquid grey cast iron is poured into casting mold, obtain tantalum wire-grey cast iron binary material precast body;
(8) cooling cleaning back is inserted heat treatment furnace to tantalum wire-grey cast iron binary material precast body;
(9) under the carbide formation temperature, be incubated;
(10) come out of the stove behind the furnace cooling, promptly make tantalum carbide and strengthen grey cast iron base composite material (4).
Described tantalum wire (1) diameter is 0.1～2.5mm; Described tantalum wire net (1) is woven into single or multiple lift, and the tantalum wire spacing is 0.2～10mm, also can suitably increase spacing according to the operating mode needs.
In the described step (2), make tantalum wire net (1) cubic cage according to the size and the specification of part.Described step (9) carbide formation temperature is 1080 ℃～1350 ℃, and soaking time is 30min～120min.
Compared with prior art, the present invention has the following advantages:
1, the principle of oozing by casting is made into precast body to the solid netted skeletal fixation of tantalum wire in the grey cast iron matrix, guaranteed the homogeneity of carbide forming element tantalum in matrix;
2, in heat treatment furnace, by 1080 ℃～1350 ℃, soaking time is 30min～120min, make tantalum atom carry out the abundant diffusion of middle long-range, permeate in the grey cast iron matrix, and with grey cast iron in carbon atom generation reaction in, naturally generate the tantalum carbide hard-phase particles, because 1080 ℃～1350 ℃ of humidity provinces are lower than the liquefaction temperature of grey cast iron, therefore the diffusion of tantalum atom belongs to solid-state diffusion, tantalum carbide also generates at solid-state reaction in down, floating and the segregation of having avoided tantalum carbide and matrix metal difference of specific gravity to cause, solved hard and be difficult to a disperse and an equally distributed Composite Preparation difficult problem mutually, and can make whole tantalums participate in reaction in generation tantalum carbide.
3, the tantalum carbide hard belongs to inner in-situ chemical reaction generation mutually, so the interface cleaning of tantalum carbide particulate is pollution-free, be combined into one with the grey cast iron matrix, has good interface in conjunction with effect, avoided adding the wild phase interface weakens problem on the conventional composite materials preparation technologies such as hard particles, the matrix material that obtains had both kept the excellent toughness of grey cast iron, and the high-wearing feature of tantalum carbide hard phase has been arranged again, had further promoted the wear-out life of material.
4, according to the needs of part, both can be positioned over the tantalum wire net part of casting mold, obtain local attrition resistant part behind the cast grey cast iron, composite bed thickness can be adjusted arbitrarily according to working condition requirement; Also can be positioned over the tantalum wire net in the whole casting mold die cavity, obtain whole attrition resistant part behind the cast grey cast iron, process controllability is strong.
Description of drawings
Fig. 1 is a schema of the present invention
Fig. 2 is the casting mold schematic cross-section that presets the tantalum wire net
Fig. 3 is a blanking liner plate precast body schematic cross-section
Fig. 4 is that whole tantalum carbide strengthens grey cast iron base composite material blanking liner plate schematic cross-section
Fig. 5 strengthens grey cast iron base composite material blanking liner plate schematic section for the partial carbonization tantalum
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
Embodiment 1: make integral composite blanking liner plate
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, concrete operations step is as follows:
(1) with 0.5mm tantalum wire braiding tantalum wire net 1, the tantalum wire spacing is 2mm;
(2) tantalum wire net 1 is cut into rectangle by blanking liner plate length and height specification;
(3) rectangle tantalum wire net 1 is carried out pickling;
(4) make casting mold 2 by the casting technique requirement;
(5) tantalum wire net 1 multilayer that cuts is superposeed, and be placed into the die cavity of water glass sand mold 2;
(6) smelt grey cast iron 3, obtain liquid grey cast iron;
(7) adopt gravity casting method that liquid grey cast iron 3 is poured into casting mold, liquid grey cast iron is full of the space of netted three-dimensional skeleton, obtains tantalum wire-grey cast iron binary material precast body;
(8) after the cleaning of cooling off-type, tantalum wire-grey cast iron binary material precast body is inserted heat treatment furnace;
(9) about 1300 ℃ of temperature, be incubated 60min down;
(10) come out of the stove behind the furnace cooling, promptly obtain whole tantalum carbide and strengthen grey cast iron base composite material blanking liner plate 4.
Embodiment 2: make local composite material blanking liner plate
As Fig. 1 and shown in Figure 5, the concrete operations step is as follows:
(1) with 2.0mm tantalum wire braiding tantalum wire net 1, the tantalum wire spacing is 10mm;
(2) tantalum wire net 1 is cut into rectangle by blanking liner plate length and half height specification;
(3) rectangle tantalum wire net is carried out pickling;
(4) make casting mold 2 by the casting technique requirement;
(5) tantalum wire net 1 multilayer that cuts is superposeed, and be placed into the die cavity of water glass sand mold 2;
(6) smelt grey cast iron 3, obtain liquid grey cast iron;
(7) adopt gravity casting method that liquid grey cast iron 3 is poured into casting mold, obtain local tantalum wire-grey cast iron binary material precast body;
(8) after the cleaning of cooling off-type, local tantalum wire-grey cast iron binary material precast body is inserted heat treatment furnace;
(9) about 1150 ℃ of temperature, be incubated 120min down;
(10) come out of the stove behind the furnace cooling, promptly obtain the partial carbonization tantalum and strengthen grey cast iron base composite material blanking liner plate 4.
Claims (5)
1. preparation process of grey cast iron based authigenic tantalum carbide composite material, it is characterized in that: this preparation technology may further comprise the steps:
(1) with tantalum wire braiding tantalum wire net (1);
(2) with tantalum wire net (1) cutting, multilayer rolls or superpose, and is prefabricated into netted cubic cage;
(3) carry out pickling and remove the greasy dirt foreign material being prefabricated into netted three-dimensional skeleton;
(4) make casting mold (2) by the casting technique requirement;
(5) the netted three-dimensional skeleton of ready-formed tantalum wire is put into casting mold (2);
(6) smelt grey cast iron (3), obtain liquid grey cast iron;
(7) liquid grey cast iron (3) is poured into casting mold (2), obtain tantalum wire-grey cast iron binary material precast body;
(8) cooling cleaning back is inserted heat treatment furnace to tantalum wire-grey cast iron binary material precast body;
(9) under the carbide formation temperature, be incubated;
(10) come out of the stove behind the furnace cooling, promptly make tantalum carbide and strengthen grey cast iron base composite material (4).
2. preparation process of grey cast iron based authigenic tantalum carbide composite material according to claim 1 is characterized in that: described tantalum wire diameter is 0.1～2.5mm.
3. preparation process of grey cast iron based authigenic tantalum carbide composite material according to claim 1 is characterized in that: described tantalum wire net (1) is woven into single or multiple lift, and the tantalum wire spacing is 0.2～10mm, also can suitably increase spacing according to the operating mode needs.
4. preparation process of grey cast iron based authigenic tantalum carbide composite material according to claim 1 is characterized in that: described step (2), make tantalum wire net cubic cage according to the size and the specification of part.
5. preparation process of grey cast iron based authigenic tantalum carbide composite material according to claim 1 is characterized in that: described step (9) carbide formation temperature is 1080 ℃～1350 ℃, and soaking time is 30min～120min.
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| CN200910218843A CN101709437A (en) | 2009-11-09 | 2009-11-09 | Preparation process of grey cast iron based authigenic tantalum carbide composite material |
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| CN200910218843A CN101709437A (en) | 2009-11-09 | 2009-11-09 | Preparation process of grey cast iron based authigenic tantalum carbide composite material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111910136A (en) * | 2020-06-23 | 2020-11-10 | 西安理工大学 | Three-dimensional fiber skeleton toughened metal ceramic and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111910136A (en) * | 2020-06-23 | 2020-11-10 | 西安理工大学 | Three-dimensional fiber skeleton toughened metal ceramic and preparation method thereof |
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Open date: 20100519 |