CN102430743A - Method for preparing surface-layer composite by using cast-infiltration method - Google Patents

Method for preparing surface-layer composite by using cast-infiltration method Download PDF

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Publication number
CN102430743A
CN102430743A CN2011103923448A CN201110392344A CN102430743A CN 102430743 A CN102430743 A CN 102430743A CN 2011103923448 A CN2011103923448 A CN 2011103923448A CN 201110392344 A CN201110392344 A CN 201110392344A CN 102430743 A CN102430743 A CN 102430743A
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China
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eps
casting
tungsten carbide
infiltration
layer composite
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CN2011103923448A
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Chinese (zh)
Inventor
�山泉
蒋业华
李祖来
周荣
岑启宏
周荣锋
隋育栋
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昆明理工大学
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Priority to CN2011103923448A priority Critical patent/CN102430743A/en
Publication of CN102430743A publication Critical patent/CN102430743A/en

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Abstract

The invention relates to a method for preparing a surface-layer composite by using a cast-infiltration method, belonging to the technical field of wear-resisting materials. The method comprises the following steps of: mixing tungsten carbide particles and cobalt powder to prepare a perform; placing the perform at a position of a part model, which needs to be wearing-resistant; and after finishing shaping, carrying out casting by using metals to realize cast-infiltration compositing to obtain the surface-layer composite with tungsten carbide and cobalt as reinforcements. According to the method disclosed by the invention, a combination effect between the tungsten carbide and the cobalt is excellent, a combination effect between a substrate and the tungsten carbide particles is enhanced due to addition of the cobalt, and therefore whole performance of the material is enhanced; and compared with the prior art, the reinforcement material containing the tungsten carbide and the cobalt, prepared by using the cast-infiltration method, not only can achieve the purpose of enhancing the wearing-resisting performance of the surface of the material, but also has the advantages of simple production process, high controllability, low cost and benefit for large-scale production.

Description

A kind of method for preparing skin layer composite material through casting infiltration
Technical field
The present invention relates to casting infiltration and prepare the moulding technique that the composite bed matrix contains the particle enhancing top layer Metal Substrate composite surface material of cobalt, belong to wear-resisting anti-friction material preparing technical field.
 
Background technology
The inefficacy of part, mostly wearing and tearing cause, and wearing and tearing occur in the surface that produces friction behavior mostly.Industrial trades such as the coal in the industry, metallurgy, mine, electric power, building materials, refractory material, the energy are had higher requirement for the wear resistance of parts in modern times, and common homogenous material more and more is difficult to satisfy the needs of objective situation.Composite rolls into one the advantage of multiple material, maximizes favourable factors and minimizes unfavourable ones, and has series of advantages such as high strength, high-modulus and light proportion concurrently.To the skin layer composite material of surface abrasion problem exploitation, comparing integral composite can reduce cost, and has extremely important realistic price.
As the key of decision composite property, ceramic particle and the lifting that combines effect between matrix are that the research of skin layer composite material is crucial.As the carbide alloy that is widely used; The tungsten carbide/cobalt carbide alloy is widely used owing to the outstanding combination effect between its two kinds of constituent elements and makes various cutting elements and wear resistant corrosion resistant part; This is because the interface of tungsten carbide and cobalt is a coherent boundary in the carbide alloy that tungsten carbide and cobalt are processed, and can obtain the good binding effect.
At present; Mainly contain thermal spraying, laser melting coating and technology such as powder sintered with tungsten carbide/cobalt as the forming method of the material that strengthens body; Be applied to tungsten carbide/cobalt about these technology and obtained the achievement in research that much has real value, but also rarely have report about the technical study of this type of composite of casting infiltration preparation as the research of the material that strengthens body.
Casting infiltration prepares the top layer reinforced composite; Its technology be with predetermined fixed such as alloy powder or ceramic particles on the ad-hoc location of type wall; Make cast(ing) surface have special organization and performance through cast then, this technology is a kind of surface treatment and moulding process combined.This method is simple, need not special treatment facility, and surface-treated layer has certain thickness; With short production cycle; Part is indeformable, has the incomparable advantage of other process, is the effective way that improves performances such as cast(ing) surface is wear-resisting, anti-corrosion, high temperature resistant.Use casting to ooze the thickness of sending out the composite bed amount for preparing is much higher than laser melting coating 1mm more than 3mm composite thickness; Composite bed has combined to overcome the thermal spraying enhancement coating with the base material excellent metallurgical and base material combines relatively poor weakness; And powder sinteredly be difficult to be applied to the surface and strengthen, these have more all explained the unique advantage of casting infiltration tungsten carbide/cobalt as the skin layer composite material that strengthens body.And with the moulding process of tungsten carbide/cobalt as the enhancing body, its economic worth is obvious, and huge actual application prospect is arranged compared to other.
Summary of the invention
The object of the invention prepares the method for skin layer composite material through casting infiltration, and a kind of process that has more operability, economical and industrial usability compared to present preparation with tungsten carbide and cobalt as the process of the material that strengthens body is provided.
Technical scheme of the present invention: be mixed and made into tungsten carbide particle and cobalt powder and preset body; Place the wear-resistant position of need of part model with presetting body; Accomplish after the moulding with metal through the row casting, realize that casting oozes compoundly, obtain with tungsten carbide and cobalt skin layer composite material as the enhancing body.Its concrete steps comprise as follows:
(1), EPS (English of expandable polystyrene is write a Chinese character in simplified form) model forming: marking cutting path on foam; Because foam gasification during cutting; Therefore when line, need leave the surplus of 1.0~1.5mm; Serviceability temperature is heated to 200~400 ℃ resistance wire eps foam is cut then, obtains the EPS model after cutting finishes;
(2), the preparation of prediction block and application: with granularity is that 40~60 purpose tungsten carbide particles and granularity are that 200~400 purpose cobalt powders mix 18~19:1~2 by volume; Add the PVA aqueous solution then as binding agent; Mix and form the enhanced granule material: mixed enhanced granule material is coated in the position that EPS mold elements surface needs to improve wear resistence; Heat hardening 0.5~1h under 40~60 ℃ of temperature is to form initialization layer, wherein; Tungsten carbide particle is as enhanced granule, and cobalt powder is used to strengthen combining of composite bed matrix and tungsten carbide particle;
(3), the bonding of running gate system model: with the EPS model that makes in the commercially available white glue with vinyl bonding step (1); Heat drying 1~1.5h under 40~60 ℃ of temperature; Be the lost foam casting coating of 1~2mm at EPS model surface and initialization layer surfaces coated last layer thickness afterwards; Under 40~60 ℃ of temperature, dry 2~3h, obtain the running gate system model;
(4), moulding: the running gate system model of step (3) is placed corresponding ordinary steel molding case; Using granularity is that the dried quartz sand of 40~60 purposes covers; In vibration frequency is 2900~3000 times/minute, and time of vibration is to vibrate sandbox under the condition in 20~30 seconds, makes it to have the required gas permeability and the degree of packing; With transparent plastic cloth the sandbox upper surface is obturaged, obtained having bubble-tight moulding box;
(5), the casting of vacuum full mold is oozed: the vacuum in the moulding box is adjusted under the negative pressure of 0.06~0.07MPa; Then metal base liquid is 1580~1600 ℃ in temperature and pours into moulding box; Suction that produces through vacuum and molten metal are wetting to tungsten carbide particle; Molten metal is sucked into comprise presetting in the body of tungsten carbide particle, treat that moulding box cools off naturally after, promptly get the tungsten carbide grain reinforced metal base composite.
Diameter≤the 1mm of resistance wire in the said step (1).
The moulding of the vaporization apperance EPS of said step (1); Also available following method: make corresponding mould according to required design of part; Press 1/8~1/12 amount of mould volume, in mould, add foam beads, directly prepare the vaporization apperance with foaming method of the prior art.
Bonding agent in the said step (2) is that concentration is PVA (PVA is that the English of the polyvinyl alcohol is called for short) aqueous solution of 6wt%, and addition is 3~6 vt% of prediction block total amount.
Lost foam casting coating is that middle lost foam casting coating is an XYSS-106 type lost foam casting coating in the said step (3).
The compacting of the enhanced granule of said step (3) is controlled the degree of packing of particle through keeping the constant total amount of regulating the enhanced granule material mixture of prefabricated section geomery.
The sandbox vibration of said step (4), its direction of vibration is the one dimension horizontal vibration.
During the vacuum full mold casting of said step (5) was oozed, metal base was chosen as high chrome, and its percentage composition wt.% is: C:1.0~1.2 wt.%; Si:1.5~1.8 wt.%, Mn:0.3~0.5 wt.%, P≤0.06 wt.%; S≤0.06 wt.%, surplus is Fe.
 
The present invention has the following advantages and good effect:
1, as the key of decision composite property, ceramic particle and the lifting that combines effect between matrix are that the research of skin layer composite material is crucial.The carbide alloy that tungsten carbide and cobalt are processed the interface be coherent boundary, can obtain the good binding effect, thereby well improve the overall performance of material.
2, use casting to ooze the thickness of sending out the composite bed amount for preparing is much higher than laser melting coating 1mm more than 3mm composite thickness; Composite bed has combined to overcome the thermal spraying enhancement coating with the base material excellent metallurgical and base material combines relatively poor weakness; And powder sinteredly be difficult to be applied to the surface and strengthen, these have more all explained the unique advantage of casting infiltration tungsten carbide/cobalt as the skin layer composite material that strengthens body.
3, compound preparation technology's controllability of the present invention is strong, with low cost, the quality of production stable, is convenient to large-scale industrialization production.
Description of drawings:
Fig. 1 is the tungsten carbide granule reinforced steel matrix skin layer composite material metallographic specimen that initialization layer adds cobalt powder among the embodiment 1.
Fig. 2 organizes for the tungsten carbide granule reinforced steel matrix skin layer composite material that initialization layer among the embodiment 1 adds cobalt powder at the interface.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment technical scheme of the present invention is further described.
Embodiment 1:
(1), the EPS model forming: marking cutting path on foam, the time need leave the surplus of 1.0mm in line, to be heated to 300 ℃ diameter be that the 1mm resistance wire cuts eps foam to serviceability temperature then, obtains the EPS model after cutting finishes;
(2), the preparation of prediction block and application: with granularity is that 40 purpose tungsten carbide particles and granularity are the 18:1 mixing by volume of 300 purpose cobalt powders; Concentration is the PVA aqueous solution bonding agent the most of 6wt% then; Addition is 3 vt% of prediction block total amount; Mix and form the enhanced granule material: mixed enhanced granule material is coated in the position that EPS mold elements surface needs to improve wear resistence, and heat hardening 0.5h under 40 ℃ of temperature is to form initialization layer;
(3), the bonding of running gate system model: with the EPS model that makes in the commercially available white glue with vinyl bonding step (1); Heat drying 1h under 50 ℃ of temperature; Be the XYSS-106 type lost foam casting coating of 2mm at EPS model surface and initialization layer surfaces coated last layer thickness afterwards; Under 50 ℃ of temperature, dry 2h, obtain the running gate system model;
(4), moulding: the running gate system model of step (3) is placed corresponding ordinary steel molding case; Using granularity is that the dried quartz sand of 60 purposes covers; In vibration frequency is 2900 times/minute; Time of vibration is to vibrate sandbox under the condition in 20 seconds, with transparent plastic cloth the sandbox upper surface is obturaged, and obtains having bubble-tight moulding box;
(5), the casting of vacuum full mold is oozed: the vacuum in the moulding box is adjusted under the negative pressure of 0.06MPa, (metal base is chosen as high chrome, and its percentage composition wt.% is: C:1.0wt.% with metal base liquid then; Si:1.8 wt.%, Mn:0.3 wt.%, P: 0.06 wt.%; S: 0.04wt.%; Surplus is Fe) be 1580 ℃ in temperature and pour into moulding box, treat that moulding box cools off naturally after, promptly get the tungsten carbide grain reinforced metal base composite.
Result of implementation
(1) surface quality of composite is high, and composite bed is even, and composite thickness reaches more than the 3mm, the also more even (see figure 1) of the distribution of tungsten carbide particle;
(2) add cobalt powder in the initialization layer after because the solid phase interface between cobalt and tungsten carbide is a coherent boundary, the combination of matrix and particle is good, has reduced because of the do not match appearance (see figure 2) of the micro-crack that causes of combination between the two.
Embodiment 2:
(1), the EPS model forming: marking cutting path on foam, the time need leave the surplus of 1.2mm in line, to be heated to 400 ℃ diameter be that the 0.5mm resistance wire cuts eps foam to serviceability temperature then, obtains the EPS model after cutting finishes;
(2), the preparation of prediction block and application: with granularity is that 50 purpose tungsten carbide particles and granularity are the 37:3 mixing by volume of 200 purpose cobalt powders; Concentration is the PVA aqueous solution bonding agent the most of 6wt% then; Addition is 5 vt% of prediction block total amount; Mix and form the enhanced granule material: mixed enhanced granule material is coated in the position that EPS mold elements surface needs to improve wear resistence, and heat hardening 0.8h under 50 ℃ of temperature is to form initialization layer;
(3), the bonding of running gate system model: with the EPS model that makes in the commercially available white glue with vinyl bonding step (1); Heat drying 1.2h under 40 ℃ of temperature; Be the XYSS-106 type lost foam casting coating of 1mm at EPS model surface and initialization layer surfaces coated last layer thickness afterwards; Under 40 ℃ of temperature, dry 2.5h, obtain the running gate system model;
(4), moulding: the running gate system model of step (3) is placed corresponding ordinary steel molding case; Using granularity is that the dried quartz sand of 40 purposes covers; In vibration frequency is 2950 times/minute; Time of vibration is to vibrate sandbox under the condition in 25 seconds, with transparent plastic cloth the sandbox upper surface is obturaged, and obtains having bubble-tight moulding box;
(5), the casting of vacuum full mold is oozed: the vacuum in the moulding box is adjusted under the negative pressure of 0.065MPa, (metal base is chosen as high chrome, and its percentage composition wt.% is: C:1.2wt.% with metal base liquid then; Si:1.5wt.%, Mn:0.4 wt.%, P: 0.04 wt.%; S: 0.06wt.%; Surplus is Fe) be 1590 ℃ in temperature and pour into moulding box, treat that moulding box cools off naturally after, promptly get the tungsten carbide grain reinforced metal base composite.
Embodiment 3:
(1), the EPS model forming: marking cutting path on foam, the time need leave the surplus of 1.5mm in line, to be heated to 200 ℃ diameter be that the 0.8mm resistance wire cuts eps foam to serviceability temperature then, obtains the EPS model after cutting finishes;
(2), the preparation of prediction block and application: with granularity is that 60 purpose tungsten carbide particles and granularity are the 19:2 mixing by volume of 400 purpose cobalt powders; Concentration is the PVA aqueous solution bonding agent the most of 6wt% then; Addition is the 6vt% of prediction block total amount; Mix and form the enhanced granule material: mixed enhanced granule material is coated in the position that EPS mold elements surface needs to improve wear resistence, and heat hardening 1h under 60 ℃ of temperature is to form initialization layer;
(3), the bonding of running gate system model: with the EPS model that makes in the commercially available white glue with vinyl bonding step (1); Heat drying 1.5h under 60 ℃ of temperature; Be the XYSS-106 type lost foam casting coating of 1.5mm at EPS model surface and initialization layer surfaces coated last layer thickness afterwards; Under 60 ℃ of temperature, dry 3h, obtain the running gate system model;
(4), moulding: the running gate system model of step (3) is placed corresponding ordinary steel molding case; Using granularity is that the dried quartz sand of 60 purposes covers; In vibration frequency is 3000 times/minute; Time of vibration is to vibrate sandbox under the condition in 30 seconds, with transparent plastic cloth the sandbox upper surface is obturaged, and obtains having bubble-tight moulding box;
(5), the casting of vacuum full mold is oozed: the vacuum in the moulding box is adjusted under the negative pressure of 0.07MPa, (metal base is chosen as high chrome, and its percentage composition wt.% is: C:1.1wt.% with metal base liquid then; Si:1.6wt.%, Mn:0.5 wt.%, P: 0.03 wt.%; S: 0.05wt.%; Surplus is Fe) be 1600 ℃ in temperature and pour into moulding box, treat that moulding box cools off naturally after, promptly get the tungsten carbide grain reinforced metal base composite.
Embodiment 4:
Identical with embodiment 1 said step; Wherein the EPS model forming of step (1) is: make corresponding mould according to required design of part; Press 1/8 amount of mould volume, in mould, add foam beads, directly prepare the vaporization apperance with foaming method of the prior art.
Embodiment 5:
Identical with embodiment 2 said steps; Wherein the EPS model forming of step (1) is: make corresponding mould according to required design of part; Press 1/10 amount of mould volume, in mould, add foam beads, directly prepare the vaporization apperance with foaming method of the prior art.
Embodiment 6:
Identical with embodiment 3 said steps; Wherein the EPS model forming of step (1) is: make corresponding mould according to required design of part; Press 1/12 amount of mould volume, in mould, add foam beads, directly prepare the vaporization apperance with foaming method of the prior art.

Claims (6)

1. one kind prepares the method for skin layer composite material through casting infiltration, it is characterized in that concrete preparation process comprises as follows:
(1), the EPS model forming: marking cutting path on foam, the time need leave the surplus of 1.0~1.5mm in line, serviceability temperature is heated to 200~400 ℃ resistance wire eps foam is cut then, obtains the EPS model after cutting finishes;
(2), the preparation of prediction block and application: with granularity is that 40~60 purpose tungsten carbide particles and granularity are that 200~400 purpose cobalt powders mix 18~19:1~2 by volume; Add the PVA aqueous solution then as binding agent; Mix and form the enhanced granule material: mixed enhanced granule material is coated in the position that EPS mold elements surface needs to improve wear resistence; Heat hardening 0.5~1h under 40~60 ℃ of temperature is to form initialization layer;
(3), the bonding of running gate system model: with the EPS model that makes in the commercially available white glue with vinyl bonding step (1); Heat drying 1~1.5h under 40~60 ℃ of temperature; Be the lost foam casting coating of 1~2mm at EPS model surface and initialization layer surfaces coated last layer thickness afterwards; Under 40~60 ℃ of temperature, dry 2~3h, obtain the running gate system model;
(4), moulding: the running gate system model of step (3) is placed corresponding ordinary steel molding case; Using granularity is that the dried quartz sand of 40~60 purposes covers; In vibration frequency is 2900~3000 times/minute; Time of vibration is to vibrate sandbox under the condition in 20~30 seconds, with transparent plastic cloth the sandbox upper surface is obturaged, and obtains having bubble-tight moulding box;
(5), the casting of vacuum full mold is oozed: the vacuum in the moulding box is adjusted under the negative pressure of 0.06~0.07MPa; Then metal base liquid is 1580~1600 ℃ in temperature and pours into moulding box; After treating that moulding box cools off naturally, promptly get the tungsten carbide grain reinforced metal base composite.
2. prepare the method for skin layer composite material according to claims 1 are described through casting infiltration, it is characterized in that: the diameter≤1mm of resistance wire in the said step (1).
3. according to claims 1 described method for preparing skin layer composite material through casting infiltration; It is characterized in that: the moulding of the vaporization apperance EPS of said step (1); Also available following method: make corresponding mould according to required design of part; Press 1/8~1/12 amount of mould volume, in mould, add foam beads, directly prepare the vaporization apperance with foaming method of the prior art.
4. prepare the method for skin layer composite material according to claims 1 are described through casting infiltration, it is characterized in that: the bonding agent in the said step (2) is that concentration is the PVA aqueous solution of 6wt%, and addition is 3~6 vt% of prediction block total amount.
5. prepare the method for skin layer composite material according to claims 1 are described through casting infiltration, it is characterized in that: lost foam casting coating is an XYSS-106 type lost foam casting coating in the said step (3).
6. prepare the method for skin layer composite material according to claims 1 are described through casting infiltration, it is characterized in that: during the vacuum full mold casting of said step (5) was oozed, metal base was chosen as high chrome; Its percentage composition wt.% is: C 1.0~1.2 wt.%; Si 1.5~1.8 wt.%, Mn 0.3~0.5 wt.%, P≤0.06 wt.%; S≤0.06 wt.%, surplus is Fe.
CN2011103923448A 2011-12-01 2011-12-01 Method for preparing surface-layer composite by using cast-infiltration method CN102430743A (en)

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CN102886508A (en) * 2012-08-27 2013-01-23 吴建化 Casting method for fusion of hard alloy or titanium carbide and wear-resistant steel
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CN103752764A (en) * 2013-12-13 2014-04-30 柳州市柳港激光科技有限公司 Composite shovel having wear resistance metal and ceramic hybrid surface layer
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CN103882276A (en) * 2013-12-13 2014-06-25 柳州市柳港激光科技有限公司 Wear-resistant material of composite shovel manufactured by using wear-resistant metal-ceramic mixed surface layer
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CN104226898A (en) * 2012-10-22 2014-12-24 宁波吉威熔模铸造有限公司 Investment casting method for bucket tooth
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CN103882276A (en) * 2013-12-13 2014-06-25 柳州市柳港激光科技有限公司 Wear-resistant material of composite shovel manufactured by using wear-resistant metal-ceramic mixed surface layer
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CN107876738A (en) * 2017-11-23 2018-04-06 河南卷烟工业烟草薄片有限公司 A kind of multicomponent alloy grinding forming method of surface with coarse grain
CN107876738B (en) * 2017-11-23 2019-08-13 河南卷烟工业烟草薄片有限公司 A kind of multicomponent alloy grinding forming method of the surface with coarse grain
CN108453243A (en) * 2018-04-10 2018-08-28 昆明理工大学 A kind of ceramic-metal composites preparation method
CN108941436A (en) * 2018-06-15 2018-12-07 王会智 A kind of composite material and production technology that steel-casting antiwear heat resisting performance can be improved
CN108941517A (en) * 2018-07-19 2018-12-07 柳州市创科复合金属陶瓷制品有限公司 A kind of ceramic-metal composite and preparation method thereof

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