CN116213727A

CN116213727A - Copper-based metal cutting knife for cutting alumina ceramics and preparation method thereof

Info

Publication number: CN116213727A
Application number: CN202211704374.2A
Authority: CN
Inventors: 冉隆光; 向先勇; 李威
Original assignee: Suzhou Sail Science & Technology Co ltd
Current assignee: Suzhou Sail Science & Technology Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-06-06
Anticipated expiration: 2042-12-29
Also published as: CN116213727B

Abstract

The invention discloses a copper-based metal cutting knife for cutting alumina ceramics and a preparation method thereof. The preparation method is as follows: mixing copper powder, tin powder, silver powder, potassium oxalate and diamond, then cold pressing and sintering to obtain alumina ceramics Copper-based metal cutting knife for cutting; the invention is based on copper powder, tin powder and silver powder are used as metal modifiers, and potassium oxalate is added. It is unexpectedly found that the blade prepared by this formula is used for cutting ceramic substrates with adhesive layers. It has the characteristics of good cutting quality and long service life.

Description

Copper-based metal cutting knife for cutting aluminum oxide ceramic and preparation method

Technical Field

The invention belongs to the blade technology, and particularly relates to a copper-based metal cutting knife for cutting aluminum oxide ceramics and a preparation method thereof.

Background

Alumina ceramic is a ceramic material with alumina (Al 2O 3) as main body, and has better conductivity, mechanical strength and high temperature resistance when used in thick film integrated circuit. At present, a resin blade is mainly used for cutting ceramics, and the applicant discloses a diamond dicing blade for cutting a ceramic substrate and a preparation method thereof, wherein a mixture of diamond, epoxy resin powder, silicon carbide, aluminum oxide, titanium oxide fibers and 4-methylbenzyl alcohol is screened by a 300-mesh sieve to obtain a molding material; hot-pressing the molding material to obtain a hot-pressed blank; solidifying the hot-pressed blank to obtain a formed body; and processing the molded body to obtain the diamond dicing blade for dividing the ceramic substrate, which can be used for cutting the ceramic substrate. The applicant also discloses a long-life resin-based cutting blade and a preparation method thereof, wherein diamond, resin powder, hydroxylated multiwall carbon nanotubes, tungsten powder and nickel powder are mixed and then hot-pressed, and then solidified, so that the long-life resin-based cutting blade is obtained and is applied to cutting of hard brittle quartz glass. The applicant discloses an ultra-thin ultra-precise cutting knife of metal bond and a preparation method thereof before, comprising the following steps of mixing copper powder and tin powder, then adding cobalt powder for mixing, then adding silicon carbide for mixing, and finally adding abrasive for mixing to obtain a material; then the materials are sintered after cold pressing to obtain a blank; and processing the blank to obtain the metal bond ultrathin superfinishing cutting knife for cutting CSP glass. But this cutting tool is unsuitable for cutting alumina ceramics, and alumina ceramics hardness is higher, and the cutting force that needs to keep higher cutting force in the dicing blade cutting process just can guarantee the cutting quality of alumina ceramics, and current cutter can adhere alumina powder and lead to cutting force to descend and influence the cutting quality of alumina ceramics at long distance cutting in-process blade.

Disclosure of Invention

The invention discloses a copper-based metal cutting knife for cutting aluminum oxide ceramic and a preparation method thereof, wherein copper powder is used as a base, tin powder and silver powder are used as metal modifiers, potassium oxalate is added, and the blade prepared by the formula is used for cutting a ceramic substrate with a glue layer, and has the characteristics of good cutting quality and long service life.

The invention adopts the following technical scheme:

a copper-based metal cutting knife for cutting aluminum oxide ceramics is prepared by mixing copper powder, tin powder, silver powder, potassium oxalate and diamond, and then cold pressing and sintering. Preferably, conventional machining is performed after sintering to obtain the copper-based metal cutting blade for cutting aluminum oxide ceramics.

Preferably, firstly, mixing copper powder and tin powder, then adding silver powder and potassium oxalate for mixing, and then adding diamond for mixing to obtain a material; then the materials are put in 3.2 to 5 tons/cm ² Cold pressing for 5-7 seconds, then heating to 550-650 ℃ from room temperature at a heating rate of 40-55 ℃/min, preserving heat for 10-30 minutes, then cooling along with a furnace, and performing conventional machining to obtain the copper-based metal cutting knife for cutting the aluminum oxide ceramic, wherein the conventional machining is inner hole and outer circle machining and double-end-face thinning machining.

In the invention, copper powder, tin powder, silver powder and potassium oxalate form a metal matrix, and the mass percentages of the components are as follows:

20 to 30 percent of tin powder

Silver powder 5-10%

Potassium oxalate 0.1-1.0%

Copper powder balance

Preferably, the mass percentages of the components are as follows:

22-27% of tin powder

Silver powder 7-9%

Potassium oxalate 0.3-0.8%

Copper powder balance

In the invention, the volume of the metal matrix and the diamond is 100 percent, and the concentration of the diamond is 25 to 50 percent, preferably 30 to 40 percent; the granularity of the diamond is 800# -400#.

The invention discloses an application of a copper-based metal cutting knife for cutting aluminum oxide ceramics in cutting aluminum oxide ceramics.

The invention discloses a method for cutting aluminum oxide ceramics by using the copper-based metal cutting knife for cutting aluminum oxide ceramics, which comprises the following steps of fixing the aluminum oxide ceramics and cutting by using the copper-based metal cutting knife for cutting aluminum oxide ceramics.

In the present invention, alumina ceramics are preferably alumina ceramics with a glue layer.

In the prior art, potassium oxalate is used for polishing, the reactivity of the potassium oxalate and a processed workpiece is mainly utilized, for example, an artificial stone mirror polishing grinding tool and a preparation method thereof, one or more than two of potassium tetraoxalate, potassium hydrogen oxalate and oxalic acid are combined as an acidic additive, and the artificial stone polishing grinding tool capable of obtaining a high-gloss mirror surface is obtained after heating and curing. For example, a fixed abrasive polishing pad and a deliquescent KDP crystal dry polishing method are provided, wherein reactant potassium oxalate in the polishing pad and KDP crystal are subjected to solid phase chemical reaction, and a generated transition layer is removed under the mechanical action of abrasive particles to obtain a smooth surface. For example, a solidified abrasive polishing pad and a dry polishing method of deliquescent crystal lanthanum bromide are provided, wherein a potassium oxalate reactant and lanthanum bromide crystals react in a solid phase under the action of a catalyst to generate a transition layer, and the transition layer is removed under the mechanical action of abrasive particles and the polishing pad to obtain a smooth surface. The invention adopts a new technical thought, the addition of potassium oxalate can improve the wear resistance, especially avoids the ceramic materials from being adhered to the surface of a metal binding agent in the cutting process, and simultaneously, the potassium oxalate does not influence the high-temperature sintering of a metal matrix, which is a different technical thought from the existing polishing which utilizes the reaction of potassium oxalate and a processing object.

Drawings

FIG. 1 is a photograph of a cut good according to the present invention.

FIG. 2 is a photograph of a conventional blade cutting chipping angle of 71 μm.

Detailed Description

The aluminum oxide ceramic has higher hardness, the cutting quality of the aluminum oxide ceramic can be ensured only by keeping higher cutting force in the cutting process of the dicing blade, the surface quality of the existing cutter is inferior to that of a metal cutter prepared by adding potassium oxalate, the cutting force is reduced due to the fact that the cutting edge of the blade is adhered with aluminum oxide powder in the long-distance cutting process, the cutting quality of the aluminum oxide ceramic is affected, and the surface of the blade added with potassium oxalate is smooth, so that the adhesion of the aluminum oxide powder can be effectively reduced, the cutting force of long-distance cutting is improved, and the cutting quality is improved. The raw materials of the invention are all commercial products, and meet the conventional requirements of cutting blades, the specific preparation operation and cutting processing of the invention are conventional techniques, and the granularity of diamond is 800# -600#.

An embodiment is a copper-based metal cutting knife for cutting alumina ceramics, which comprises the following metal matrix components in percentage by mass:

66.5% copper powder

Tin powder 25%

Silver powder 8%

Potassium oxalate 0.5%

(1) Mixing: according to the formula proportion, a conventional mixer is adopted, firstly copper powder and tin powder are added for mixing for 1 hour, then silver powder and potassium oxalate are added for mixing for 0.5 hour, finally diamond is added for mixing for 1 hour, so that a material is obtained, 1Kg of a metal matrix is obtained, the volumes of the metal matrix and the diamond are 100%, and the concentration of the diamond is 35%;

(2) Cold press molding: sieving the material in the step (1) with a 200-mesh screen for 5 times, taking undersize material, feeding at room temperature, pressing, and applying pressure of 4 tons/cm ² The pressure maintaining time is 6 seconds, and a cold-pressed blank body is obtained;

(3) Sintering and forming: placing the cold pressed compact in the step (2) together with a die into a sintering furnace, heating up to the final sintering temperature of 600 ℃ at the temperature of 50 ℃/min, preserving heat for 30 minutes, cooling to the room temperature along with the furnace, taking out, and removing burrs for later use;

(4) Inner hole and excircle processing: placing the sintered blank in a tool, setting the feeding speed of an internal grinding machine at 1 mu m/S, setting the rotating speed of a grinding machine by self, setting the feeding speed of an external grinding machine at 5 mu m/S, processing until the drawing requires dimensional accuracy, and then removing the electric processing burrs by using oilstones;

(5) Thinning the double end faces: placing the blank body subjected to the inner and outer circle processing in a double-end-face thinning machine, fixing a tool clamp, selecting a proper pressure, a proper rotating speed and a proper grinding wheel disc for thinning, and processing until the drawing requires dimensional accuracy to obtain a 54mm (O.D) X0.1 mm (T) X40 mm (I.D) dicing cutter.

In the above method, deburring and steps (4) and (5) are conventional techniques.

The thickness of the alumina ceramic material is 0.6mm, the alumina ceramic material is 0.4mm, the adhesive layer is 0.2mm, and the cutting speed is 7mm/s. Cutting depth is thoroughly cut.

Example one processing result: the cutter blade has no adhesive alumina powder, good quality and no obvious edge and corner breakage after cutting for 100 meters, see figure 1.

CN114472889a discloses an ultra-thin ultra-fine cutting knife of metal bond, which is used for the same cutting process, and when 72 meters are cut, a photo of a cutting angle is found, and the angle is 71 μm, see fig. 2.

On the basis of the first embodiment, potassium oxalate is omitted, the rest is unchanged, and the cutting force of the blade is reduced and the cutting quality is poor due to the fact that the blade is adhered with alumina powder in the cutting process of the dicing blade.

On the basis of the first embodiment, the potassium oxalate is replaced by ammonium bicarbonate, and the rest is unchanged, so that the dicing blade is obtained. For the same cutting process described above, only 68 meters can be cut; the added bicarbonate can not obviously improve the surface quality of the blade, and meanwhile, the ammonium bicarbonate can volatilize carbon dioxide, ammonia gas and other gases at high temperature to form air holes in the blade, so that the overall compactness of the blade is affected, and the cutting quality and the service life of the blade are affected.

Based on the first embodiment, the silver powder is replaced by nickel powder, and the rest is unchanged, so that the dicing blade is obtained, and in the cutting process, the temperature of the blade is too high to cause burn of the adhesive layer of the ceramic material.

Comparative example

A copper-based metal cutting knife for cutting alumina ceramics comprises the following metal matrix components in percentage by mass:

65.5% copper powder

Tin powder 25%

Silver powder 8%

Potassium oxalate 1.5%

The rest is the same as the example, and a dicing blade is obtained. And after too much potassium oxalate is added, the strength of the metal knife bonding agent is reduced, the cutting life of the blade is reduced, and the cutting is less than 80 meters.

The formula adopts a copper-based formula, the self-sharpening property and the chip removal capability of the dicing blade can be improved by adding oxalate, meanwhile, the copper bonding agent is modified by adopting silver powder, the strength of the dicing blade can be improved by adding silver powder, meanwhile, the dicing blade manufactured according to the formula has good heat conductivity, and the dicing blade has excellent cutting quality, can replace a resin dicing blade to be used for cutting a ceramic substrate with a glue layer, and has the characteristic of long service life of the metal dicing blade.

Claims

1. A copper-based metal cutting knife for aluminum oxide ceramic cutting, its preparation method is, copper powder, tin powder, silver powder, potassium oxalate, diamond are mixed, then cold-pressed, sintered, obtain the copper-based metal for aluminum oxide ceramic cutting cutting knife.

2. according to the described copper base metal cutter of alumina ceramics cutting of claim 1, it is characterized in that, copper powder, tin powder, silver powder, potassium oxalate form metal matrix, and each component mass percent is as follows:

.

3. according to the described copper base metal cutter of alumina ceramics cutting of claim 1, it is characterized in that, copper powder, tin powder, silver powder, potassium oxalate form metal carcass, and each component mass percent is as follows:

Tin powder 22-27%

Silver powder 7-9%

Potassium oxalate 0.3-0.8%

Copper powder balance.

4. according to the described copper base metal cutter of alumina ceramic cutting of claim 1, it is characterized in that, copper powder, tin powder, silver powder, potassium oxalate form metal carcass, be 100% with the volume of metal carcass, diamond, The concentration of diamond is 25%-50%; the particle size of diamond is 800#-400#.

5. The copper-based metal cutter for cutting alumina ceramics according to claim 4, wherein the concentration of diamond is 30%-40%.

6. The copper-based metal cutter for cutting alumina ceramics as claimed in claim 1 is characterized in that, copper powder and tin powder are mixed first, then silver powder and potassium oxalate are added to mix, and then diamond is added to mix to obtain the material; The material is cold-pressed and then heat-treated to obtain a copper-based metal cutting knife for cutting alumina ceramics.

7. according to the preparation method of the described aluminum oxide ceramic cutting of claim 6 copper base metal cutter, it is characterized in that, first copper powder, tin powder are mixed, then add silver powder, potassium oxalate and mix, then add diamond and mix, Obtain the material; then cold-press the material at 3.2-5 tons/ ^cm2 for 5-7 seconds, then raise the temperature from room temperature to 550-650°C at a heating rate of 40-55°C/min, keep it warm for 10-30 minutes, and then The furnace is cooled to obtain a copper-based metal cutting knife for cutting alumina ceramics.

8. The application of the copper-based metal cutter for cutting alumina ceramics according to claim 1 in cutting alumina ceramics.

9. the application of copper powder, tin powder, silver powder, potassium oxalate in the copper-based metal cutter for cutting aluminum oxide ceramics described in preparation claim 1.

10. The method for cutting alumina ceramics with a copper-based metal cutter for cutting alumina ceramics according to claim 1, comprising the steps of fixing the alumina ceramics, and then cutting with a copper-based metal cutter for cutting alumina ceramics.