CN100434228C

CN100434228C - Copper-manganese based prealloy powder for metal-diamond soldering, and its prodn. method

Info

Publication number: CN100434228C
Application number: CNB2006101048465A
Authority: CN
Inventors: 徐可为; 南俊马; 赵宁; 袁洁
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2006-11-02
Filing date: 2006-11-02
Publication date: 2008-11-19
Anticipated expiration: 2026-11-02
Also published as: CN1947921A

Abstract

A CuMn-based prealloy powder used for the soldering between metal and diamond is proportionally prepared from Cu, Mn, Ti, and La or Ce through mixing, vacuum smelting, and atomizing in high-purity argon gas.

Description

Metal-diamond brazing copper manganese base pre-alloyed powder and preparation method thereof

Technical field

The present invention relates to a kind of pre-alloyed powder and preparation method thereof, relate in particular to copper manganese base pre-alloyed powder of a kind of metal-diamond hybrid composite goods and preparation method thereof.

Background technology

Diamond is widely used in fields such as geological drilling, oil exploitation, building decoration, microelectronic component and machine-building because of having high hardness, especially aspect the processing such as sawing, scribing, cutting, boring, grinding and polishing of pottery, glass, stone material, Silicon Wafer, polymer, quartz crystal, magnetic material and carbide alloy irreplaceable effect is arranged at hard brittle material.

The diamond of industrial use is the fine particle shape, and size is generally 0.01-0.50mm, can't independently fulfil the cutting function as monolithic element, usually needs and the use that is combined with each other of base (tire) body material.Compound core is to set up plate the fix mechanism of carcass to diamond particles, strengthens hold, realizes by making the goods that have definite shape and have certain mechanical performance.The carcass role shows both ways, and the one, support also and control diamond, prevent to come off too early; Another is and the wearing and tearing of diamond coupling, constantly keeps from sharp ability.Products Quality depends on the performance of carcass to a great extent, and the performance of carcass depends primarily on the composition of carcass material.Common carcass material has metal, resin and pottery etc., and wherein metal matrix has obtained extensive use with excellent comprehensive performances, accounts for more than 80% of total product amount.

The metal-base diamond goods often adopt powder metallurgic method, with diamond particles and metal matrix powder after hot pressed sintering make.In manufacturing process, the problem that receives much attention is the interface bonding state that the composition of metal matrix and diamond interface both sides changes and causes thus.Study this state variation, both can disclose the character of adhesion, also can be the carcass material design foundation is provided.Studies show that both at home and abroad metal matrix mainly is cast setting power and chemical bond power to durability of diamond.The former is the main forms of current goods; The latter can realize that then hold increases substantially, but key is the chemical reaction that will form between carcass and the diamond.Owing to there is very high interface energy between metal and the diamond, in the carcass system that actual production is adopted, both are difficult to form the chemical bond combination, but plate based on machinery, can't set up brute force and control, and have seriously restricted the lifting of goods class.

Realize the metallurgical binding of metal matrix and diamond particles, improve interface bonding state between the two, become the focus of domestic and international research so far.All in all, research mainly concentrates on following three aspects.

(1) introduces active element: in existing metal matrix system, add an amount of strong carbide forming element such as Ti, Cr, V and Zr etc., activate adamantine surface by sintering, impel chemical reaction and form the carbide transition zone, help to improve carcass and circle, adamantine interface intensity.But this method has certain degree of difficulty in the specific implementation, at first higher as the fusing point of simple substance element own, desire to reach chemical reaction and must improve sintering temperature, certainly will cause that adamantine fire damage increases, though cause bond strength to improve, the intensity of diamond self has reduced; Secondly active element all is that trace adds, and is difficult for evenly distributing in carcass, and the different diamond particles and the bond strength of carcass there are differences; Moreover the strong carbide element also is strong oxide elements, in process of production as can not be adequately protected, is prone to oxidized phenomenon before the carbonization, also just can not realize effective metallurgical binding.These will seriously restrict the development of this technology, also be not promoted the main cause of using so far.

(2) Modified Diamond: adopt physics or chemical vapour deposition (CVD), sputter plating, evaporation plating, technology such as chemical plating and plating even, form metal film or alloy film coating at diamond surface, by this coating and the good wetability of metal matrix, carry out chemical bonding through the later stage sintering.Common carbide unit element coating has Ti, Cr, TiN etc., and non-carbide unit's element coating such as Ni, Cu etc. are also arranged.Research in this regard both at home and abroad keeps synchronized development substantially, and technical merit is also suitable, and the diamond product of existing surface metalation appears on the market, and has still entered industrial applications.Should note excessive weightening finish and coating layering problem in this technology of enforcement, the former influences the sharpness and even the working (machining) efficiency of goods, and the latter then can not reach the purpose of metallurgical binding.

(3) Vacuum Soldering Technology: be fusing, wetting and sprawl, diamond and metal matrix material are welded together, reach metallurgical binding by solder self.The core of this technology is a solder, essence is a kind of ultra-fine prealloy powder, have a series of special physics, chemistry and mechanical property, be that generally the simple substance element mixed-powder of employing is not available at present, become the emphasis of research in recent years, and show the potentiality that significantly improve product properties, be one of main direction of Mirae Corp.'s development.Yan Jiu center of gravity is the adaptability of solder and carcass material and diamond particles from now on, is reducing fusion temperature especially, strengthens aspects such as wetability and spreading ability and also need carry out the development of system.

From above research trends, the Vacuum Soldering Technology of diamond composition is undoubtedly in occupation of critical positions.Seek optimal path, develop the novel prealloy superfines that adapts with it exactly, comprise composition design, preparation method and shaping process technology this technical support.The prealloy powder is the external new ideas that propose of late nineteen nineties in last century, why solder is referred to as prealloy, be to be different from the alloying of diamond composition metal matrix powder in sintering process on the surface, essence is to want the part of solder as carcass, has the property that adapts to the soldering processes requirement.With regard to the powder preparation, external research starting early, Dr.Fritsch, the Belgian Umicore of Germany, companies such as the Eurotungstene serial pre-alloyed powder that releases one after another of France are arranged so far, and synthetic method is to have gas atomization, the eutectoid precipitation method and metallic vapour method.In recent years domesticly also carried out relevant exploration work, the CuSnTi alloy powder of existing mechanical crushing method trial-production has reduced about 900 ℃ of alloy melting point by improving Sn content, but its mechanical property especially toughness be badly damaged; Also the someone adopts the AgCuTi alloy, just not saying high Ag content causes to cost an arm and a leg it can not be used in a large number in diamond composition is made, and is only synthetic also by no means easy with regard to powder; The powders such as NiCrBSi that also have the atomization preparation, sintering temperature strengthen diamond fire damage degree, even carbonization phenomenon occurs up to more than 1050 ℃.

Summary of the invention

For shortcoming or the deficiency that overcomes prior art, the object of the present invention is to provide a kind of metal-diamond brazing copper manganese base pre-alloyed powder and preparation method thereof, comprise copper, manganese, titanium, rare earth lanthanum or cerium in the pre-alloyed powder of preparation, the preparation method adopts powder by gas-atomization equipment to carry out, and the metal-diamond brazing that makes can improve durability of diamond significantly with copper manganese base pre-alloyed powder.

In order to realize above-mentioned goal of the invention, the present invention is achieved by the following technical solutions:

A kind of copper manganese base pre-alloyed powder, be made up of following chemical components and percentage by weight thereof: Cu57.3-62.7%, Mn 30.4-33.3%, Ti 4.0-12.3%, La or Ce 0.05-0.30%, the percentage by weight sum of above all components is 100%.

The preparation method of above-mentioned copper manganese base pre-alloyed powder adopts powder by gas-atomization equipment, carries out according to following steps:

(1) with after Cu, Mn, Ti, La or four kinds of element proportionings of Ce, place smelting furnace:

(2) be under the condition of 5～30MPa in vacuum, be heated to 1100～1400 ℃, the fusing of will preparing burden;

(3) in powder collector, charge into 4～8m ³High-purity argon gas;

(4) to be poured onto temperature be in 1100～1500 ℃ the insulation bottom pour ladle to the batching after will melting, with the high-purity argon gas is atomization gas, atomizes by the batching of atomizer to above-mentioned fusing, and atomization pressure is 2～4MPa, in powder collector, form powder, be pre-alloyed powder.

The fusing point of pre-alloyed powder of the present invention is lower, composition is even, antioxygenic property is good, good fluidity, can significantly improve durability of diamond, the diamond tool that adopts this kind powder to make has characteristics such as intensity height, sharp, the long service life of processing; The preparation method of above-mentioned pre-alloyed powder has characteristics such as technological process is simple, constant product quality.

Description of drawings

Fig. 1 is the fusing point test curve of embodiment 1 pre-alloyed powder.

Fig. 2 is embodiment 1 a pre-alloyed powder pattern photo.

Fig. 3 is embodiment 1 individual particle pre-alloyed powder constituent analysis figure as a result.

Fig. 4 is the fusing point test curve of embodiment 2 prealloy powder.

Fig. 5 is the fusing point test curve of embodiment 3 prealloy powder.

Fig. 6 is the fusing point test curve of embodiment 4 prealloy powder.

The specific embodiment

The embodiment that provides below in conjunction with accompanying drawing and inventor specifies the present invention:

Embodiment 1:

Metal-the diamond brazing of present embodiment is made by following ingredients by weight percentage with copper manganese base prealloy powder: Cu 60%, Mn 31.7%, Ti 8%, La 0.3%.

The preparation method of the pre-alloyed powder of present embodiment carries out according to the following steps:

(1) takes by weighing batching by said ratio, and place smelting furnace;

(2) be under the condition of 10MPa in vacuum, be heated to 1200 ℃, the fusing of will preparing burden;

(3) 6m will be charged in the powder collector ³Purity is 99.999% high-purity argon gas;

(4) to be poured onto temperature be in 1300 ℃ the insulation bottom pour ladle to the batching after will melting, with the high-purity argon gas is atomization gas, atomize by the batching of atomizer to above-mentioned fusing, in powder collector, form powder, atomization pressure is 4MPa, resulting pre-alloyed powder granularity is less than 50 μ m, Fig. 2, Fig. 3 in conjunction with the accompanying drawings 1,, can see that the obtained fusing point that gets pre-alloyed powder of present embodiment is 860-880 ℃, pre-alloyed powder is shaped as sphere, and granularity is that 5-40 μ m and pre-alloyed powder composition are even.

Embodiment 2:

Preparation process is identical with embodiment 1, only changes each composition percentage by weight: Cu 62%, Mn32.9%, Ti 5%, La 0.1%, and the fusing point of the prealloy powder of accompanying drawing 4 demonstration present embodiments is between 850-880 ℃.

Embodiment 3

Preparation process is identical with embodiment 1, only changes each composition percentage by weight: Cu 58.6%, Mn31.2%, Ti 10%, La 0.2%, and the fusing point of the prealloy powder of accompanying drawing 5 demonstration present embodiments is between 860-880 ℃.

Embodiment 4

Preparation process is identical with embodiment 1, only changes each composition percentage by weight: Cu 57.4%, Mn30.45%, Ti 12%, La 0.15%, and the fusing point of the prealloy powder of accompanying drawing 6 demonstration present embodiments is between 860-880 ℃.

Claims

1, metal-diamond brazing copper manganese base pre-alloyed powder, the chemical composition and the percentage by weight thereof that it is characterized in that the copper manganese base prealloy powder that makes are: Cu 57.3～62.7%, Mn 30.4～33.3%, Ti 4.0～12.3%, La or Ce 0.05～0.30%, the percentage by weight sum of above all components is 100%.