CN101181741A - Method for preparing TiB2-TiC ceramic particle gradient-enhanced steel matrix composite - Google Patents
Method for preparing TiB2-TiC ceramic particle gradient-enhanced steel matrix composite Download PDFInfo
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- CN101181741A CN101181741A CNA2007100563567A CN200710056356A CN101181741A CN 101181741 A CN101181741 A CN 101181741A CN A2007100563567 A CNA2007100563567 A CN A2007100563567A CN 200710056356 A CN200710056356 A CN 200710056356A CN 101181741 A CN101181741 A CN 101181741A
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Abstract
The invention relates to a preparation method of ceramic particles reinforced metal-matrix composite material, in particular to the preparation technique of gradient or partial reinforced steel-matrix composite material, aiming at intensifying special zones or positions of castings that have to be reinforced with in-situ reaction-formed ceramic particles, thus not only ensuring the toughness of the metal matrix body, but also enhancing the high hardness and abrasion-resistant performances of the service areas or positions. The technique of the invention comprises two stages: preparation of pressed shape of reactants and combustion synthesis reaction of casting mold cavity: 1) cheap industrial Ti-Fe powder and B4C powder are taken as reactants and fully blended according to a preset proportion, which are pressed into billet; 2) pretreated reactants are pressed and placed to the special zones or positions of the castings that have to be reinforced in the casting mold, and the pressed billets are cast with high temperature metal steel liquid to induce combustion synthesis reaction, so as to in-situ form ceramic enhanced particles of TiB2and TiC materials. Compared with the prior art, the invention has the advantages of simple and reliable technique, low cost and being easy to popularize and use.
Description
Technical field
The present invention relates to the preparation method of metal-base composites, particularly relate to the preparation method of the base steel composite material of in-situ ceramic particle gradient enhancing.
Background technology
Ceramic particle reinforced metal base composites have performance isotropism, preparation technology simple, with low cost, be easy to advantages such as castable, become one of research focus of field of compound material.Yet, no matter add or in-situ particle enhancing metal-base composites, mostly be whole and strengthen.But in many instances, and do not require that material monolithic all carries out particle and strengthens.Only need crown to strengthen as excavator shovel tooth, tooth trousers part then need have good obdurability, in case early fracture and losing efficacy in the use.Equally, grinder hammerhead only hits the position at tup to be needed to strengthen, and keeps high hardness, and the hammer body then needs certain toughness, avoids hammering into shape the body fracture failure.In addition, whole reinforced composite material cost height has limited its range of application to a certain extent, therefore, is badly in need of the gradient enhancement metal-based composite of development of new.
At present, gradient or the local preparation method who strengthens metal-base composites mainly contain two kinds: outer addition and in-situ reaction.Outer addition is that the ceramic particle that will form passes through to add binding agent, is pressed into prefabricated section after mixing, and further is prepared into composite then.As in the patent 95113785.9 with WC, Al
2O
3Or pottery such as SiC and bonding make the prefabricated section of required form mutually behind the mixing, is affixed on the casting mold part that needs to strengthen foundry goods, and the casting liquid metals promptly obtains local composite material.The main deficiency of outer addition is the particle surface vulnerable to pollution, and bond strength is low.Ceramic particle forms by chemical reaction in the in-situ reaction, and particle surface cleaning, shape are regular, and with the basal body interface bond strength height, thereby enjoy favor.As adopting Al, Ti and C powder to make prefabricated section in the patent 02109101.3, form in-situ ceramic particle TiC at the casting mold internal reaction, the local base steel composite material that strengthens of preparation; Adopt Ni, Al, Ti and C powder to make briquet in the patent 200610038185.0, casting metals liquid afterreaction forms TiC/Ni
3Al intermetallic compound base surface composite coating; In the patent 200610016778.7 Al powder, Ti-Fe powder and C powder are mixed and made into prefabricated section, prepare the TiC granule partial by the casting metals molten steel and strengthen base steel composite material.
Summary of the invention
It is simple relatively, reliable to the purpose of this invention is to provide a kind of technology, and with low cost and original position porcelain particle gradient that be easy to apply strengthens the preparation method of base steel composite material.
Technical scheme of the present invention is: adopt cheap industrial Ti-Fe powder and B
4The C powder brings out the combustion synthesis reaction of pressed compact by casting high-temperature metal molten steel in the casting mold, forms original position TiB
2With the TiC ceramic particle, the preparation ceramic grain gradient reinforcing base steel composite material.Specific embodiment comprises the preparation of reactant pressed compact and two stages of combustion synthesis reaction in the casting mold die cavity:
1) preparation of reactant pressed compact:
A. pressed compact is formed: pressed compact is by the industrial B of powder particles less than 80 microns
4C powder and Ti-Fe powder are formed, and wherein the Ti content in the Ti-Fe powder is 25%≤Ti≤70%, B
4The ratio of C powder and Ti-Fe powder is TiB in molar ratio
2: TiC=2: 1,
B. batch mixing: with the above-mentioned B for preparing
4C powder and Ti-Fe powder are packed in the ball mill mixing machine, and batch mixing 6 ± 1 hours makes it to mix,
C. compression moulding: the powder that mixes is put into mould, at room temperature be pressed into base, green density is 3.4 ± 0.9 gram per centimeters
3
2) combustion synthesis reaction in the casting mold die cavity:
A. preliminary treatment: the reactant pressed compact put into vacuum or the drying oven of argon shield is arranged, be heated to 350 ± 150 ℃, oven dry degasification 4 ± 1 hours,
B. combustion synthesis reaction: pretreated pressed compact is placed specific region or the position that foundry goods need strengthen in the casting mold die cavity, subsequently 1550 ± 50 ℃ of high-temperature metal molten steel are poured in the casting mold, bring out the combustion synthesis reaction in the pressed compact, form TiB
2With the TiC ceramic particle, thereby prepare original position TiB
2-TiC ceramic grain gradient reinforcing base steel composite material.
The present invention compares with present existing technology has following characteristics:
It is simple relatively, reliable to the invention provides a kind of technology, the with low cost and original position two-phase TiB that is easy to apply
2The preparation method of-TiC ceramic grain gradient reinforcing base steel composite material promptly adopts industrial Ti-Fe powder and B
4The reaction of C powder forms original position TiB
2With the TiC ceramic particle, improve performance of composites by the enhancing of ceramic grain gradient zone.In addition,, both reduced cost, reduced again in the course of reaction because the pore that the vaporization of Al forms tendency makes and composite densification more improved its performance owing to do not add the Al powder in the reactant pressed compact.
1) in-situ ceramic strengthens particle TiB
2Reaction forms with TiC, and shape is regular, and surface cleaning adds the intensity height with matrix bond;
2) simple and reliable process, with low cost, reactant replaces pure Ti powder with cheap industrial Ti-Fe powder, has reduced cost;
3) do not have the Al powder in the reactant pressed compact, both reduced cost, reduced the pore tendency in the composite again, composite compactness improves, and then has improved performance;
4) original position strengthens particle TiB
2Controlled with the TiC volume fraction.
Description of drawings
Fig. 1 (a) adopts pressed compact to consist of～74 microns 28Ti-Fe powder and～10 microns B
4The ceramic grain gradient reinforcing base steel composite material scanning tissue of C powder preparation
Fig. 1 (b) adopts pressed compact to consist of～74 microns 48Ti-Fe powder and～10 microns B
4The ceramic grain gradient reinforcing base steel composite material tissue of C powder preparation
Fig. 1 (c) adopts pressed compact to consist of～74 microns 68Ti-Fe powder and～10 microns B
4The ceramic grain gradient reinforcing base steel composite material tissue of C powder preparation
Fig. 2 adopts pressed compact to consist of～74 microns 68Ti-Fe powder and～10 microns B
4The ceramic grain gradient reinforcing base steel composite material mirco structure of C powder preparation
Fig. 3 adopts pressed compact to consist of～74 microns 48Ti-Fe powder and～10 microns B
4Ceramic grain gradient reinforcing base steel composite material enhancement region, transition region and the matrix area macrostructure of the preparation of C powder
The specific embodiment
The in-situ ceramic particle gradient that utilizes the present invention to prepare strengthens base steel composite material, and in the toughness that keeps matrix alloy material itself to have, hardness and abrasion resistance properties that gradient strengthens the zone are significantly improved.With the 45# steel is matrix, brings out the combustion synthesis reaction of pressed compact in the casting mold by the high-temperature metal molten steel, has prepared the in-situ ceramic particle gradient and has strengthened base steel composite material, and concrete preparation parameter and performance data are as shown in table 1.Because ceramic particle TiB
2Form by chemical reaction with TiC, particle surface cleaning, shape are regular, and with the basal body interface bond strength height, have good production and market application foreground and potentiality.
Table 1 in-situ ceramic particle gradient strengthens base steel composite material preparation parameter and performance data
Claims (1)
1. TiB
2The preparation method of-TiC ceramic grain gradient reinforcing base steel composite material is characterized in that technical process comprises the preparation of reactant pressed compact and two stages of combustion synthesis reaction in the casting mold die cavity:
1) preparation of reactant pressed compact:
A. pressed compact is formed: pressed compact is by the industrial B of powder particles less than 80 microns
4C powder and Ti-Fe powder are formed, and wherein the Ti content in the Ti-Fe powder is 25%≤Ti≤70%, B
4The ratio of C powder and Ti-Fe powder is TiB in molar ratio
2: TiC=2: 1,
B. batch mixing: with the above-mentioned B for preparing
4C powder and Ti-Fe powder are packed in the ball mill mixing machine, and batch mixing 6 ± 1 hours makes it to mix,
C. compression moulding: the powder that mixes is put into mould, at room temperature be pressed into base, green density is 3.2 ± 0.3～3.4 ± 0.9 gram per centimeter
3
2) combustion synthesis reaction in the casting mold die cavity:
A. preliminary treatment: the reactant pressed compact put into vacuum or the drying oven of argon shield is arranged, be heated to 350 ± 150 ℃, oven dry degasification 4 ± 1 hours,
B. combustion synthesis reaction: pretreated pressed compact is placed specific region or the position that foundry goods need strengthen in the casting mold die cavity, subsequently 1550 ± 50 ℃ of high-temperature metal molten steel are poured in the casting mold, bring out the combustion synthesis reaction in the pressed compact, form TiB
2With the TiC ceramic particle, thereby prepare original position TiB
2-TiC ceramic grain gradient reinforcing base steel composite material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100563567A CN101181741A (en) | 2007-11-27 | 2007-11-27 | Method for preparing TiB2-TiC ceramic particle gradient-enhanced steel matrix composite |
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| CNA2007100563567A CN101181741A (en) | 2007-11-27 | 2007-11-27 | Method for preparing TiB2-TiC ceramic particle gradient-enhanced steel matrix composite |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103447504A (en) * | 2013-08-21 | 2013-12-18 | 吉林大学 | Preparation method of bionic coupling wear-resistant material |
| CN109023098A (en) * | 2018-09-18 | 2018-12-18 | 安徽省众文重科新材料有限公司 | A kind of Ceramo-steel and its production method that high intensity chemical inertness is good |
-
2007
- 2007-11-27 CN CNA2007100563567A patent/CN101181741A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103447504A (en) * | 2013-08-21 | 2013-12-18 | 吉林大学 | Preparation method of bionic coupling wear-resistant material |
| CN109023098A (en) * | 2018-09-18 | 2018-12-18 | 安徽省众文重科新材料有限公司 | A kind of Ceramo-steel and its production method that high intensity chemical inertness is good |
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Open date: 20080521 |