JPH0333090A - Composite chip made of ceramics for circular saw blade and production thereof - Google Patents

Abstract

PURPOSE:To obtain the composite chip made of ceramics for circular saw blades having a thick metallized layer with which crack and peel hardly arise at the time of joining with steel main body by forming the metallized layer at the max. thickness within a specific range on at least one surface of the sintered body of ceramics having a polyhedral shape. CONSTITUTION:The composite chip made of ceramics for circular saw blades is formed by fixing the metallized layer of a metal and/or alloy having 40 to 100mum max. thickness on at least one surface of the sintered body of the ceramics having the polyhedral shape. The above-mentioned composite chip is produced by the following method: The mixture composed of the metal and/or alloy, cellulose and org. solvent is applied on at least one surface of the sintered body of the ceramics having the polyhedral shape and is dried. The sintered body is then heated to the temp. at which the powder of the metal and/or alloy melts in a vacuum or inert gas to fix the metallized layer of the metal and/or alloy having 40 to 100mum max. thickness on at least one surface of the sintered body of the ceramics.

Description

[Detailed description of the invention] (Industrial application field) The present invention applies to wood, metal materials, and plastic materials.

Tips for circular saw blades for cutting various materials such as laminated materials, fiber-reinforced materials, or ceramic materials, especially circular saw blades suitable for cutting laminated materials, fiber-reinforced materials, or ceramic materials that are difficult to cut in this field. The present invention relates to a ceramic composite chip for saw blades and a method for manufacturing the same.

(Prior art) Circular saws, which are generally referred to as metal saws or chip saws, are made entirely of steel, such as the woodworking circular saw of JIS 84802, or made of steel, such as the carbide metal saw of JIS B4109. Some have a made body with a cemented carbide tip brazed as a cutting edge.

Among these circular saws, carbide metal saws are mainly used for cutting hard materials or materials that are difficult to cut because of their excellent wear resistance.

However, various materials recently used in buildings, such as building materials such as exterior wall materials, floor materials, and interior materials, refractory materials such as furnace walls, and insulation materials for space rockets, are
New materials with material or structural characteristics are used. When cutting these new materials with a cemented carbide metal saw, the wear of the cemented carbide tip is significantly greater than with conventional materials, resulting in an increase in cutting resistance and a decrease in cutting force. There is a problem of chipping, cracking, or cracking occurring on the cut surface of certain new materials. Therefore, studies are underway to use ceramic tips, which are thought to have better wear resistance than cemented carbide, for the cutting edge of circular saws. When using a ceramic tip as the cutting edge of a circular saw, the biggest issue is the bonding between the ceramic tip and the steel body.

Many proposals have been made for joining ceramics and metals, including the Telefunken method, active metal method, hydride compound method, and oxide method for joining sintered bodies on silicon nitride to metals. Metallizing methods such as the solder method and the silver sulfate method have been proposed. However, the joint area of the cutting edge of a circular saw is small, ranging from a few positives to approximately on+-, and the impact force applied to the joint surface due to the harsh conditions of cutting is extremely large and harsh, so we have not been able to maintain the content of previous proposals as is. There is a problem that even if it is applied to a circular saw, it cannot be put to practical use.

(Problem to be Solved by the Invention) When applying a solder material to the surface of a tip for a circular saw blade, it is possible to apply a solder material to the surface of a tip for a circular saw blade by, for example, using a physical vapor deposition method such as sputtering or ion brate ink, or by applying the solder material as a paste-like mixture. ll
There is a way to do it. Of these, the former method is an excellent method that can be applied uniformly, but has the problems of being expensive and difficult to apply, while the latter method is relatively inexpensive, but With a small chip.

Since the area to be coated is narrow, there are problems in that mass production is difficult, it is difficult to coat uniformly, and it is relatively difficult to coat thickly.

In addition, in the latter method, even if the paste state of the solder material is made good and it is possible to control the coating thickness and apply the coating to a uniform thickness, it is possible to make it possible to control the coating thickness and apply the coating to a uniform thickness.
When the jl material is melted to form a metallized layer, there is a problem in that the surface of the metallized layer becomes convex, making it difficult to join it to the steel main body.

The present invention solves the above-mentioned problems. Specifically, the present invention is directed to a circular saw blade made of ceramic having a thick metallized layer that is less prone to cracking and peeling when bonded to a steel body. The object of the present invention is to provide a composite chip and a method for manufacturing the same.

(Means for Solving the Problems) With the aim of developing a ceramic chip that can be used for the cutting edge of a circular saw, the present inventors have developed a method for forming a metallized layer on the surface of the chip using a chip shape for circular saw blades. , we were mainly considering the relationship between metallized layer thickness and bonding strength, and found that the relaxation of thermal stress during bonding caused by the difference in thermal expansion coefficient between the W4!1 main body and the chip, and the metalized layer caused by stress in practical use. The present invention was completed by confirming that there is an optimum metallized layer thickness for a ceramic chip for a circular saw blade based on the plastic deformability of the ceramic chip.

That is, the ceramic composite tip for a circular saw blade of the present invention is made by fixing a metallized layer of metal and/or alloy with a maximum thickness of 40 to 100 μm on at least one surface of a polyhedral ceramic sintered body. It is characterized by:

The polyhedral ceramic sintered body of the ceramic composite tip for circular saw blades of the present invention is as follows.

There are no particular restrictions on the shape, and various ceramic sintered bodies can be used by selecting the material of the metallized layer.
Specifically, 1, for example, the conventional ^flood, 0. Oxide ceramics whose main component is

Oxide ceramics whose main component is Zr0a.

Non-oxide ceramics whose main component is 5isNa.

Examples include non-oxide ceramics containing SiC as a main component. Among these, if the ceramic sintered body is a sintered body whose main component is silicon nitride, it is a ceramic building material or fireproof material.

As a circular saw blade tip for cutting insulation materials, etc.
This is particularly preferable. This sintered body containing silicon nitride as a main component includes a conventional silicon nitride sintered body containing 50 vofi% or more of silicon nitride or a sialon-based sintered body, which has a hardness of 92.011++^ or less at room temperature. E and fracture toughness value (+c) is 6.0 & IH/, 2
A sintered body mainly composed of silicon nitride having a characteristic of 18 or more is preferable.

Specifically, the metallized layer in the ceramic composite chip for circular saw blades of the present invention is, for example, ^g-Cu-Ti,
Activated metal such as Zr, Ag-Cu-Sn-activated metal, Cu-A-activated metal, ^g-Cu-
^ Shinobu-activated metal, Ag-Cu-Ni-activated metal,
Ag-Cu-3i-activated metal, Cu-activated metal,
Ag-activated metals and the like can be mentioned. Among these, in the case of a sintered body whose main component is silicon nitride, the bonding strength is excellent when the metallized layer is a combination of Ag-Cu-Ti, especially when Ag50-83wt% and Cu15
40 wt% and Ti2 to 1 Owt% is preferable because it increases the bonding strength between the steel body and the ceramic.

When the maximum thickness of this metallized layer is less than 40 μm,
When joining the steel body of a circular saw with the ceramic sintered body, the activated metal in the material tends to be reduced, and the solder material scatters, further reducing the thickness of the metallized layer. This results in a decrease in bonding strength, and conversely,
If the maximum thickness exceeds 100 μm, cracks are likely to occur in the ceramic sintered body when the steel body of the circular saw is joined to the ceramic sintered body, reducing the joint strength. For this purpose, the maximum thickness of the metallized layer is 40-10
It is defined as 0 μm.

When producing the ceramic composite chip for circular saw blades of the present invention, in addition to the above-mentioned Telefunken method, hydrogen compound method, oxide solder method, silver carbonate method, pattern plating method using electroless plating etc., adhesive In the additive method using a chip with adhesive attached, it is possible to form a metallized layer on the surface of the chip by applying a dry film resist such as a full additive method in which the adhesive is plated. It is necessary to form 17 metallized layers in a small area of 30 mm, it is necessary to form a metallized layer with no sag with a surface facing down to the surface of the chip to be metallized, and it is uniform over the entire small area. It is necessary to form a metallized layer, and the first-order method is preferable as a method that can be mass-produced.

In other words, 1) the method of manufacturing a ceramic composite tip for a circular saw blade of the present invention is to apply a paste-like mixture of metal and/or alloy powder, cellulose, and an organic solvent to at least one surface of a ceramic sintered body having a polyhedral shape; It is dried and then heated in air or in an inert gas to a temperature at which the metal and/or alloy powder is melted to form a maximum thickness on at least one side of the ceramic sintered body. This method is characterized by fixing a metallized layer of metal and/or alloy having a diameter of 40 to 100 μm.

The paste-like mixture in the production method of the present invention includes metal and/or alloy powder that will become the metallized layer, cellulose such as acetyl cellulose, ethyl cellulose, and methyl cellulose, and hydrocarbon-based, alcohol-based, phenol-based, A mixture consisting of an organic solvent such as an ether type, and in particular a mixture of metal and/or alloy powder made into a paste with an ether type ethylcellulose and an organic solvent of a terpene compound such as terpineol is preferred. When this paste-like mixture is applied to at least one surface of a ceramic sintered body chip, it is preferable to apply the spraying method or the screen printing method. After the mixture was applied to the surface of the chip in this way, it was dried and then placed in a reaction vessel.

By heating the mixture to a temperature at which the metal and/or alloy powder is melted, the composite chip of the present invention having a metallized layer fixed to the surface of the chip can be produced. The inside of the reaction vessel during the formation of this metallized layer is
For example, after applying a higher vacuum than 10 Torr, or reducing or pressurizing with an inert gas,
℃ and then, once the metal and/or alloy in the mixture melts, it is held for example for 1 to 60 minutes, particularly preferably for 1 to 60 minutes.
After holding for a short time of about 5 minutes, it is preferable to cool down as quickly as possible to prevent sagging or convex metallized layers.

(Function) In the ceramic sintered chip for circular saw blades of the present invention, the activated metal in the metallized layer and the chip are diffusion-welded at the boundary between the metallized layer and the chip, and as a result, the metallized layer and the chip are bonded by diffusion. Furthermore, when the metallized layer with a maximum thickness of 40 to 100 μm is bonded to the steel body of the circular saw, it has the effect of relieving stress caused by the difference in thermal expansion coefficient and ceramic sintering. This serves to prevent IL from cracking into the solid chip. Also.

In the method of manufacturing a ceramic composite tip for a circular saw blade of the present invention, a paste-like mixture having an optimal viscosity consisting of metal and/or alloy powder, cellulose, and an organic solvent is used to form a thick metallized layer. Its function is to make it easier.

(Example) Example 1 Commercially available 5rsNa-AJBN YJs series 5
The 2.4x6 open surface of the ceramic sintered chip (shape 2x2.4x6n+n+) with iJ4 as the primary component and the 2x2
．． 4. On the two sides of the mm side? Owt%^g-26wt%
A paste mixture obtained by kneading a metal powder having a composition of Cu4wt%Ti, ethylcellulose, and terpineol was applied by a screen printing method, and then dried. Then,
Each sample was heated at 900°C in a vacuum of IQ-3 Torr.
After heating, the samples were held for 1 minute and cooled to obtain products 1 to 4 of the present invention and comparative products 1 to 4. The thickness of the metallized layer of each sample obtained in this way was examined using a microscope, and the results were used for the first
Shown in the table.

Next, these invention products 1 to 4 and comparative products 1 to 4 were each bonded to SK5 carbon tool steel by a high-frequency brazing method using a flux similar to the conventional silver brazing method, and the chips and metallization were bonded. The presence or absence of cracks at the joint between the layer and the steel body was examined using a microscope, and the results are also listed in Table 1.

In Table 1, products 1 to 4 of the present invention and comparative products 1 to 4, which had no cracks in the joints, were joined to an SK5 steel body using the same brazing method as above. I made a saw. In addition to comparing each of the Pi circular saws and a commercially available circular saw with a carbide blade as Comparative Product 5, a cutting test was conducted on cement containing glass fiber with a thickness of 30++ m, and the cutting distance was determined to determine the cutting distance. The results are also listed in Table 1.

Margin below

Claims (6)

[Claims] (1) A metal and/or material having a maximum thickness of 40 to 100 μm on at least one side of a ceramic sintered body having a polyhedral shape.
Or a ceramic composite tip for a circular saw blade, which is made by fixing a metallized layer of an alloy. (2) Claim 1, wherein the ceramic sintered body is a sintered body containing silicon nitride as a main component.
Ceramic composite tip for circular saw blades as described in section. (3) The metallized layer contains 50 to 83 wt% of Ag and C.
The ceramic composite tip for a circular saw blade according to item 1 or 2, comprising 15 to 40 wt% U and 2 to 10 wt% Ti. (4) After applying a paste-like mixture of metal and/or alloy powder, cellulose, and an organic solvent to at least one surface of a polyhedral ceramic sintered body, it is dried, and then dried in a vacuum or under an inert gas. The powder of the metal and/or alloy is heated to a temperature at which it is melted, so that at least one surface of the ceramic sintered body has a maximum thickness of 40 to 100 mm.
A method for manufacturing a ceramic composite tip for a circular saw blade, characterized by fixing a metallized layer of metal and/or alloy of μm. (5) Claim 4, characterized in that the ceramic sintered body is a sintered body containing silicon nitride as a main component.
A method for manufacturing a ceramic composite tip for circular saw blades as described in . (6) The above metal and/or alloy is Ag50-83wt%
, 15 to 40 wt% of Cu, and 2 to 10 wt% of Ti.
A method for manufacturing a ceramic composite tip for circular saw blades as described in .