CN1185067C - Casting with in-situ generated surface cermet layer and its productino process - Google Patents
Casting with in-situ generated surface cermet layer and its productino process Download PDFInfo
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- CN1185067C CN1185067C CNB011337842A CN01133784A CN1185067C CN 1185067 C CN1185067 C CN 1185067C CN B011337842 A CNB011337842 A CN B011337842A CN 01133784 A CN01133784 A CN 01133784A CN 1185067 C CN1185067 C CN 1185067C
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Abstract
The present invention provides a casting with an in-situ endogeneous surface metal ceramic layer, which uses steel/iron as a mother body. The casting of the present invention is characterized in that the surface metal ceramic layer is obtained by that the in-situ endogeneous reaction of powdery material pressed blanks due to the heat of poured molten steel/iron, wherein ceramic granules has the volume fraction of greater than 40% and the thickness of 0.5mm to 12mm. The making method of the casting comprises the following steps: corresponding powdery material of in-situ endogenous components and filler components is reduced and made into the pressed blanks, the pressed blanks are treated with presintering and degumming and then fixed on a mold face, and the high-temperature molten steel/iron is poured to excite the in-situ endogenous reaction, so that sintering densification of the pressed blanks and firm metallurgical bond with the mother body can be promoted by the heat generated from the reaction. The casting of the present invention has the advantages of high abrasive resistance, good toughness, smooth surface, good quality, fewer making processes, short cycle and low cost. The making method is suitable for the mass production of castings in various shapes and opens a new way for forming the metal ceramic surface of the casting.
Description
Technical field
The invention belongs to metal surface metal ceramic technical field, be specifically related to a kind of foundry goods and preparation method thereof with in-situ endogenic surface cermet layer.
Background technology
Ceramic material is the third generation material after metal material and macromolecular material, has good heat endurance, wearability and corrosion resistance, but because too high cost and extremely low toughness has limited its application.In order to improve the toughness of ceramic material, people begin with little metal the principal phase ceramic bonding have been formed a kind of ceramic-metallic hard material together.This material is when having kept ceramic intrinsic excellent abrasive resistance, because the adding of metal phase is arranged, its toughness also has increased significantly, but because its forming method only limits to powder metallurgic method (Li Rongjiu chief editor, Ceramic-to-Metal composite, nineteen ninety-five, metallurgical industry publishing house, Beijing), so its production cost height, only be suitable for making simple shape, the less product of size, as cutting tool, boring tool etc.In addition, the cermet of powder metallurgic method manufacturing is a kind of integral material, though the adding of metal phase has improved its toughness, because its principal phase is a ceramic phase, so its toughness is still poor than traditional ferrous materials.
In order to overcome the defective that the cermet integral material exists, give full play to the high characteristic of metal material Heat stability is good, intensity and toughness simultaneously, engineers and technicians research and develop out metal surface metal ceramic product again, promptly form the layer of metal ceramic layer, to satisfy the high requirement of member excellent wear-resisting, the inherent toughness in use needed surface at metal material surface as parent.Can make at present the method for this product and have only hot spray process (Tan Changyao, Wang Junshi chief editor, " practical surface engineering technology ", in May, 1998, New Age Press, Beijing).Hot spray process is because due to the characteristics of method itself, its used pottery is the special ceramics powder that adds, and price is very expensive; Product surface layer and parent are difficult to form firm metallurgical binding; Superficial layer is thinner, can not change as required and easily oxidation and formation pore; Production process is many, the cost height; Be unsuitable for producing in enormous quantities.
Summary of the invention
The objective of the invention is to overcome the defective that prior art exists, a kind of foundry goods with in-situ endogenic surface cermet layer is provided.Another object of the present invention provides the method that a kind of preparation has in-situ endogenic surface cermet layer foundry goods.
Foundry goods with in-situ endogenic surface cermet layer provided by the invention, its parent is steel or iron, the surface is a cermet coating, it is characterized in that the cast(ing) surface cermet coating is to utilize the heat of the high-temperature molten steel of casting and pouring or molten iron to make the powder pressed compact generation in-situ endogenic reaction of being fixed in mo(U)ld face and obtain, percentage by volume＞40% of the ceramic particle in the cermet coating that its surface forms, and its thickness can be adjusted control according to the needs of casting section thickness and use in 0.5～12 millimeter scope.
Preparation method with in-situ endogenic surface cermet layer foundry goods provided by the invention is the advantage that has merged powder metallurgy, casting and self-propagating high-temperature, in foundry production, directly generates the cermet coating of desired thickness at cast(ing) surface.Be the powder pressed compact generation high-temperature chemical reaction that the heat of high-temperature molten steel or molten iron makes mold cavity surface when utilizing casting and pouring specifically, original position generates a large amount of carbide ceramic particles, emit heat simultaneously and impel the pressed compact sintering densification, and realization and the firm metallurgical binding of foundry goods parent, finally form cermet coating at cast(ing) surface.Its processing step for make casting mold, make pressed compact, processing is come unstuck in pressed compact presintering, pressed compact is fixed, melting molten steel or molten iron, cast and sintering, it is characterized in that:
(1) powder of making pressed compact is the in-situ endogenic component of granularity≤50 micron, and its weight percent content is 40～80% and the filler component of granularity≤50 micron, and its weight percent content is 20～60%;
(2) before making pressed compact, powder is put into reduction furnace, feed hydrogen or decompose ammonia, under 600～1000 ℃, reduce 0.5～8 hour time.
Wherein used in-situ endogenic component contains C20% and Ti80% by weight percentage, or contains C 4～20% and Ti 10～71%, and V 10～71%, and W 10～70%, among the Nb 15～75% at least two kinds or three kinds.
Used filler component contains Cr 1～35% by weight percentage, and Ni 3～30%, and Mo 1～30%, Fe 5～35% and TiC, WC, nickel bag ZrO
2, nickel bag Al
2O
3In any, content 25～75%.
The present invention has the following advantages:
1, the foundry goods with in-situ endogenic surface cermet layer provided by the invention, owing to contain at the working surface of foundry goods＞40% ceramic phase, therefore the wearability of this foundry goods has greatly improved than other metal material, and ceramic phase is mainly obtained by the in-situ endogenic reaction, cost both can significantly reduce, and can form firm metallurgical binding with the foundry goods parent again.
2, the foundry goods with in-situ endogenic surface cermet layer provided by the invention, owing to its surface cermet layer is by the molten steel of casting process cast or the heat of molten iron the pressed compact generation in-situ endogenic reaction of being fixed in mo(U)ld face to be obtained, so what the thickness of its superficial layer can be according to casting section thickness and instructions for use is different, in 0.5～12 millimeter, change, this is that present hot spray process is beyond one's reach, and surfacing, quality is good.
3, because the present invention has carried out reduction to powder handles, not only greatly reduce the oxygen content of powder before making pressed compact, improved the suppression performance of powder, but also avoided because of the too high pore that produces at superficial layer of powder oxygen content, defective such as be mingled with.
4, because the present invention utilizes the molten steel of casting process cast or the heat of molten iron, in the pressed compact of mo(U)ld face, excite the in-situ endogenic reaction, and utilize the reaction liberated heat promote to realize the pressed compact sintering densification and with the firm metallurgical binding of parent, whole process is once finished when casting, therefore can overcome the deficiency of hot spray process, is fit to produce in enormous quantities the foundry goods of different shape, operation is few, with short production cycle, cost is low, and does not need expensive equipment.
5, because the present invention only needs wear-resisting, heat-resisting surface to generate cermet coating at foundry goods, and foundry goods body and other position still be inexpensive common in, mild steel, low-alloy steel, spheroidal graphite cast-iron or casting pig, thereby compare with the bulk ceramics material, not only can save the ceramic powder of a large amount of costlinesses, and toughness height, the good combination property of its foundry goods, can reach outer hard interior tough, can satisfy the requirement of under high temperature, high speed and sharp wear operating mode, working.
6,,, thereby open up a new way for the cast(ing) surface metal ceramic directly at steel-casting or Iron Casting Surface in-situ endogenic cermet coating because the present invention can be in casting process.
The specific embodiment
Embodiment given below is to specific descriptions of the present invention and further specifies; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment to the present invention according to the invention described above content.
Embodiment 1～8:
(1) makes casting mold and make casting mold according to a conventional method with the water-glass sand of routine or clay-bonded sand or resin sand.
(2) make component, the kind proportioning that pressed compact press table 1,2, listed each embodiment of 3 correspondences, and the various powders of granularity≤50 micron place together ball mill or other mixer mixing or/and further levigate; Place again in hydrogen or the decomposition ammonia reduction furnace, reduce down for 600～1000 ℃ in temperature and handled 0.5～8 hour; Add 2～12% binding agent then, pack metal die behind the mixing on hydraulic press, be pressed into 0.5～12 millimeter pressed compact.
(3) pressed compact presintering is come unstuck to handle pressed compact is placed vacuum sintering furnace or reducing atmosphere sintering furnace, carries out the presintering processing of coming unstuck under 500～1400 ℃ of temperature.
(4) pressed compact fixing with cooled pressed compact with binding agent or fixation with steel wire at mo(U)ld face, mould assembling etc. is to be cast again.
(5) melting molten steel or molten iron be corresponding furnace charge melting molten steel or molten iron according to a conventional method in electric arc furnaces or electric induction furnace, and handle accordingly.
(6) cast and sintering pour into casting mold with high-temperature molten steel or molten iron, 1400～1600 ℃ of pouring temperatures, and utilize its heat to finish reaction of pressed compact in-situ endogenic and sintering densification.
Table 1
Table 2
Table 3
Claims (5)
1, a kind of foundry goods with in-situ endogenic surface cermet layer, the parent of this foundry goods is steel or iron, the surface is a cermet coating, the cermet coating that it is characterized in that cast(ing) surface is to utilize the high-temperature molten steel of casting and pouring or the heat of molten iron to make the powder pressed compact generation in-situ endogenic reaction of being fixed in mo(U)ld face and obtain percentage by volume＞40% of the ceramic particle in the cermet coating that its surface forms.
2, the foundry goods with in-situ endogenic surface cermet layer according to claim 1, the thickness that it is characterized in that the cermet coating of this cast(ing) surface is 0.5～12 millimeter.
3, a kind of preparation method with in-situ endogenic surface cermet layer foundry goods, its processing step for make casting mold, make pressed compact, processing is come unstuck in pressed compact presintering, pressed compact is fixed, melting molten steel or molten iron, cast and sintering, it is characterized in that:
(1) powder of making pressed compact is the in-situ endogenic component of granularity≤50 micron, and its weight percent content is 40～80% and the filler component of granularity≤50 micron, and its weight percent content is 20～60%;
(2) before making pressed compact, powder is put into reduction furnace, feed hydrogen or decompose ammonia, under 600～1000 ℃, reduce 0.5～8 hour time.
4, the preparation method with in-situ endogenic surface cermet layer foundry goods according to claim 3, it is characterized in that the in-situ endogenic component by weight percentage, contain C 4%, Nb 26%, W 70%, or contain C 20%, Ti 80%, or contain C 5%, Nb 75%, Ti 10%, V 10%, or contain C 10%, Nb 15%, V 75%, or contain C 8%, Ti 40%, W 52%, or contain C 15%, Ti 30%, V 45%, W 10%, or contain C 6%, Nb 40%, Ti 20%, W 34%.
5, according to claim 3 or 4 described preparation methods with in-situ endogenic surface cermet layer foundry goods, it is characterized in that filler component by weight percentage, contain Cr 1～35%, Ni 3～30%, Mo 1～30%, Fe 5～35% and TiC, WC, nickel bag ZrO
2, nickel bag Al
2O
3In any, content 25～75%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011337842A CN1185067C (en) | 2001-12-30 | 2001-12-30 | Casting with in-situ generated surface cermet layer and its productino process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011337842A CN1185067C (en) | 2001-12-30 | 2001-12-30 | Casting with in-situ generated surface cermet layer and its productino process |
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| Publication Number | Publication Date |
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| CN1375368A CN1375368A (en) | 2002-10-23 |
| CN1185067C true CN1185067C (en) | 2005-01-19 |
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| CNB011337842A Expired - Fee Related CN1185067C (en) | 2001-12-30 | 2001-12-30 | Casting with in-situ generated surface cermet layer and its productino process |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384609C (en) * | 2002-11-05 | 2008-04-30 | 鲍志勇 | Casting infiltration method of heating power for preparing composite alloy material with metal base |
| CN102274923B (en) * | 2011-08-04 | 2013-08-28 | 广东新劲刚新材料科技股份有限公司 | Method for in situ synthesis of tungsten carbide-based hard alloy coating on surface of cast |
| CN104533992B (en) * | 2014-11-18 | 2018-06-01 | 西安理工大学 | Brake disc and preparation method thereof |
| CN113766984B (en) * | 2019-04-30 | 2023-09-22 | 伊诺科有限责任公司 | Tungsten carbide reinforced composite material based on in-situ manufactured alloy and method for producing same |
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