CN104646852B - Pricker applies cream and its application - Google Patents

Abstract

The invention discloses a brazing paste and an application thereof. The brazing paste preferably includes: 65-95wt% powdery brazing material, and a binder for mixing with the powdery brazing material to form the brazing paste in fluid or paste form. The powdery brazing material comprises: 40wt%-90wt% diamond powder, and the particle size of the diamond powder is 5-1000 microns, the purity is greater than 99%, and the brazing powder contains Cu and/or Any two or more of Ni and Mn, Ti, Cr, Al, Sn, and Fe as additive elements. The brazing paste of the present invention has excellent thixotropy, fluidity and certain viscosity. It does not need to be pressed and formed during use, and can be directly injected on the surface of steel parts and other substrates through an injection device without molds and pressure equipment. It can also be used with The traditional brazing material powder is brazed by the same process, and the obtained brazed diamond tool has good bonding strength, grinding force and service life, high yield, high material utilization, high production efficiency and low production cost.

Description

Brazing paste and its application

technical field

The invention specifically relates to a brazing paste, its preparation method and application, and belongs to the technical field of diamond coating.

Background technique

Hard and brittle materials, such as stone, glass, ceramics and other common building materials, as well as high-grade advanced engineering and functional materials such as gems, semiconductors, engineering ceramics, optical crystals, magnetic materials, bioceramics, etc., need to be prepared with abrasives with higher hardness Compared with other abrasives, diamond has extremely high hardness, high relative wear resistance, thermal conductivity and compressive strength. Therefore, diamond tools are the most commonly used tools for cutting and grinding hard and brittle materials. In the manufacturing process of metal bond diamond tools, brazing, sintering and electroplating are the three most important manufacturing methods. Among the three methods, the brazing process is the method with the highest bonding strength of diamond particles, because during the brazing process, the solder alloy melts and capillary action makes the alloy tightly wrap the diamond, and at the same time, the diamond and the solder alloy Strong chemical bonds are formed between them, which greatly improves the cutting performance and self-sharpening of the tool, and is especially suitable for high-speed and efficient grinding.

The conventional brazing process is to alkali-wash and pickle the steel saw blade base to remove oil and oxide layer, then distribute the mixture of diamond particles and brazing filler metal on the steel saw blade base, and use a press to perform cold pressing. Form a green body with a certain strength, and finally put it into a vacuum brazing furnace for brazing. CN102319934A discloses the production process of manufacturing diamond tools by brazing method and the composition of brazing material powder. This type of brazing material powder is composed of nickel-based metal powder and diamond particles, which can be brazed after pressing and forming, but due to the It is a brittle material, and it is not easy to undergo plastic deformation during the pressing process and cannot bite with the surrounding particles. Therefore, the strength of the green body is not high, especially for saw blades that require an extremely thin diamond abrasive layer. In addition, this kind of green body is often damaged when the material is transferred in the production line, which leads to the waste of raw materials and reduces the yield of finished products.

Contents of the invention

The main purpose of the present invention is to provide a brazing paste, which has excellent thixotropy and fluidity, does not need to be pressed into a green body during use, can overcome the deficiencies of the prior art, and replace traditional powdered brazing materials .

Another object of the present invention is to provide a method for preparing the brazing paste.

Another object of the present invention is to provide the application of the brazing paste.

In order to realize the aforementioned object of the invention, the technical solutions adopted in the present invention include:

A kind of brazing paste, it comprises:

powdered brazing materials, and

a binder for mixing with the powdered brazing material to form the brazing paste in fluid or paste form;

Wherein, the powdery brazing material comprises:

diamond powder, and

The brazing powder contains Cu and/or Ni as basic elements and any two or more of Mn, Ti, Cr, Al, Sn, and Fe as additive elements.

As one of the more preferred embodiments, the brazing paste is composed of powdered brazing material and adhesive.

As one of the more preferred embodiments, the brazing paste contains 65-95wt% powdered brazing material.

As one of the more preferred embodiments, the powder brazing material contains 40wt%-90wt% diamond powder.

As one of the more preferred embodiments, the particle size of the diamond powder is 5-1000 microns, and the purity is greater than 99%.

As one of the more preferred embodiments, the brazing powder comprises a mixture of metal powders and/or alloy powders, and the mixture of metal powders and/or alloy powders comprises: Cu 11-14wt%, Mn 18-25wt%, An alloy powder of 5-10wt% Ti, 8-11wt% Al, 1-2.1wt% Sn, and the remainder contains Ni.

Particularly preferably, the mixture and/or alloy powder of the metal powder comprises: Cu 11-14wt%, Mn 18-25wt%, Ti 5-10wt%, Al 8-11wt%, Sn 1-2.1wt% alloy powder , and the balance is Ni.

As one of the more preferred embodiments, the brazing powder contains any one of the first alloy powder, the second alloy powder, the third alloy powder, and the fourth alloy powder, or a combination of two or more.

Further, the first alloy powder includes: 0.5-10wt% Mn, 0.2-15wt% Ti, and the rest includes Cu. Particularly preferably, the first alloy powder contains 0.5-10wt% Mn, 0.2-15wt% Ti, and the balance is Cu.

Further, the second alloy powder includes: 0.5-10wt% Mn, 0.2-10wt% Cr, and the rest includes Cu. Particularly preferably, the second alloy powder comprises: 0.5-10wt% Mn, 0.2-10wt% Cr, and the balance is Cu.

Further, the third alloy powder includes Sn 2-10wt%, Ni 0.2-8wt%, Cr 2-15wt%, and the rest includes Cu. Particularly preferably, the third alloy powder comprises: Sn 2-10wt%, Ni 0.2-8wt%, Cr 2-15wt%, and the balance is Cu.

Further, the fourth alloy powder contains Sn 0.5-10wt%, Ni 0.2-15wt%, Ti 0.2-5wt%, and the rest contains Cu. Particularly preferably, the fourth alloy powder contains 0.5-10wt% Sn, 0.2-15wt% Ni, 0.2-5wt% Ti, and the balance is Cu.

As one of the more preferred embodiments, the brazing powder contains a mixture of metal powders, the mixture of metal powders contains Cu powder 72-98wt%, Ni powder 0.5-15wt%, Fe powder 0.1-4wt%, Mn powder 0.2-4wt%, Cr powder 0.5-5wt%.

It should be noted that the alloy powder mentioned above is an alloyed metal powder obtained by melting, atomizing or diffusing two or more metal or non-metal elements, rather than a simple mixture of several element powders.

As one of the more preferred embodiments, the adhesive contains 50%-98wt% solvent, 0.5-8wt% thickener, 0.2-35wt% rheological agent, 0.1-5wt% defoamer and activator.

Further, the solvent can at least preferably be selected from but not limited to any one of deionized water, diethylene glycol monoethyl ether, dipropylene glycol monomethyl ether, 1,2-propylene glycol, ethyl carbitol, ethylene glycol or more.

Further, the thickener may be preferably selected from but not limited to hydroxyethyl starch, hydroxypropyl starch, methyl acrylate, polymethyl methacrylate, carboxymethyl starch, hydroxyethyl cellulose, ethyl hydroxyethyl Any one or more of base cellulose, dibutyl phthalate, epoxy resin, chitin, guar gum, xanthan gum, Arabic gum, locust bean gum.

Further, the rheological agent may be preferably selected from but not limited to any one or more of hydrogenated castor oil, glycerin, stearic acid, and salicylic acid amide.

Further, the defoamer and activator may be preferably selected from but not limited to any one or more of acetylene glycol, benzotriazepam, silicone oil, mineral oil, and vegetable oil.

Further, the viscosity of the brazing paste is 30000-150000 cps.

The preparation method of any aforementioned brazing paste, comprising:

1) uniformly mixing brazing powder and diamond powder in a mixer to make powdery brazing material;

2) Add thickener, rheological agent, defoamer and activator into the solvent, stir and form a uniform adhesive;

3) Add the powdery brazing material into the adhesive and stir evenly to obtain the brazing paste.

Application of any one of the aforementioned brazing pastes in the preparation of diamond material layers or diamond tools.

A diamond tool, which includes a substrate and a diamond layer bonded to the surface of the substrate, the diamond layer is mainly formed by brazing any one of the aforementioned brazing pastes.

Further, the diamond tool includes a diamond saw blade.

The present invention also provides the preparation method of described diamond tool, it comprises:

At least selecting the injection method to apply the brazing paste to the surface of the substrate to form a blank;

And, brazing the blank in a vacuum environment or a protective atmosphere to form the diamond tool.

For example, in a typical implementation case, a method for preparing a diamond saw blade may include: filling brazing paste into an injection device (for example, a glue dispenser or a paste dispenser), and dispensing the paste as needed through the injection device. The shape of the saw blade is injected on the base surface of the steel saw blade, and then the blank containing the saw blade is sent into a vacuum furnace or an atmosphere protection furnace, and the same process as traditional powder brazing is adopted (brazing temperature 850-1150°C, time not exceeding 60min) Brazing is carried out, wherein, since the adhesive used has been completely volatilized at low temperature (below 300°C), after brazing, no other impurities will remain on the surface of the parts except diamond abrasives and brazing metal.

Compared with the prior art, the advantages of the present invention include: providing a new type of paste brazing material (hereinafter referred to as "brazing paste"), which has excellent thixotropy, fluidity and certain viscosity, and can be used during use It does not need to be pressed and formed, and can be directly injected on the surface of steel parts and other substrates through the injection device, without the need for molds and pressure equipment, and can be brazed using the same process as traditional brazing material powders, and the brazed diamond tools obtained have good properties. Excellent bonding strength, grinding force and service life, high yield, high material utilization, high production efficiency and low production cost.

detailed description

The technical solution of the present invention will be further explained below in conjunction with several embodiments.

Examples 1-6 are prepared according to the composition shown in Table 1 and brazing paste.

Inject the brazing paste configured in Examples 1-6 on the surface of the steel saw blade base with a dispenser or a paste dispenser according to the required shape, and then send the saw blade blank into a vacuum furnace or an atmosphere protection furnace , using the same process as traditional powder brazing (brazing temperature 850-1150°C, time not exceeding 60min) for brazing, in which, since the adhesive used has been completely volatilized at low temperature (below 300°C), therefore, After brazing, except for diamond abrasives and brazing metal, the surface of the parts has obvious metallic luster, no black carbide residue, and no other impurities remain, and a number of finished diamond saw blades (referred to as "example products") are obtained.

For Comparative Examples 1-6, the powdered brazing materials in Examples 1-6 were directly used as brazing material, and a plurality of diamond saw blade products (referred to as "comparative example products") were made by referring to the method provided by CN102319934A.

The performance of the example product and the comparative example product is tested respectively in the same way, and it can be found that the bond strength between the diamond layer and the substrate in the example product is substantially better than that of the comparative example product, and the grinding force and service life of the example product Also surpassed the comparative example product. In addition, the yield rate of the example product is about 99.8%, while the yield rate of the control example product is about 98%.

It should be pointed out that the specific implementation manners of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

The composition of brazing paste in table 1 embodiment 1-6

Claims (8)

1. a kind of pricker applies cream, it is characterised in that including：

The powdery brazing material of 65-95wt%, and

Bonding agent, cream is applied to be mixed to form with the powdery brazing material in the pricker of flow-like or paste；

Wherein, the powdery brazing material is included：

40wt%-90wt% diamond dusts, and

Brazing powder, comprising：

The mixture or alloyed powder of metal powder, comprising：Cu 11-14wt%, Mn 18-25wt%, Ti 5-10wt%, Al 8- The alloyed powder of 11wt%, Sn 1-2.1wt%, balance of Ni；

Or, any one or more in following first alloyed powder, the second alloyed powder, the 3rd alloyed powder, the 4th alloyed powder Composition, wherein,

First alloyed powder, comprising：Mn 0.5-10wt%, Ti 0.2-15wt%, balance of Cu,

Second alloyed powder, comprising：Mn 0.5-10wt%, Cr 0.2-10wt%, balance of Cu,

3rd alloyed powder, comprising：Sn 2-10wt%, Ni 0.2-8wt%, Cr 2-15wt%, balance of Cu,

4th alloyed powder, comprising：Sn 0.5-10wt%, Ni 0.2-15wt%, Ti 0.2-5wt%, balance of Cu；

Or, the mixture of metal powder, comprising：Cu powder 72-98wt%, Ni powder 0.5-15wt%, Fe powder 0.1-4wt%, Mn powder 0.2-4wt%, Cr powder 0.5-5wt%.

2. pricker according to claim 1 applies cream, it is characterised in that：The particle diameter of the bortz powder is 5-1000 microns, pure Degree is more than 99%.

3. pricker according to claim 1 applies cream, it is characterised in that：The bonding agent includes 50%-98wt% solvents, 0.5- 8wt% thickeners, 0.2-35wt% rheological agents, 0.1-5wt% defoamers and activator；

Wherein, the solvent is at least selected from deionized water, diethylene glycol monoethyl ether, dipropylene glycol monomethyl ether, 1,2-PD, second Any one in base carbitol, ethylene glycol；

The thickener is at least selected from HES, hydroxypropul starch, methyl acrylate, polymethyl methacrylate, carboxylic first Base starch, hydroxyethyl cellulose, ethylhydroxyethylcellulose, dibutyl phthalate, epoxy resin, chitin, guar gum, Any one in xanthans, Arabic gum, locust bean gum；

The rheological agent is at least selected from any one in rilanit special, glycerine, stearic acid, salicylamide；

The defoamer and activator are at least selected from any one in acetylenic glycols, the nitrogen file of benzo three, silicone oil, mineral oil, vegetable oil.

4. pricker according to claim 1 applies cream, it is characterised in that：The viscosity that the pricker applies cream is 30000-150000cps.

5. pricker any one of claim 1-4 applies application of the cream in diamond material or diamond tool is prepared.

6. a kind of diamond tool, it is characterised in that including matrix and be incorporated into the diamond layer of matrix surface, the Buddha's warrior attendant The main pricker as any one of claim 1-4 of rock layers applies cream soldering and is formed.

7. diamond tool according to claim 6, it is characterised in that it includes diamond saw blade.

8. the preparation method of diamond tool described in claim 6 or 7, it is characterised in that including：

The pricker any one of claim 1-4 is at least applied into cream from injection system and puts on matrix surface formation blank；

And, the blank is carried out into soldering in vacuum environment or protective atmosphere, form the diamond tool.