JPS6085940A - High hardness composite sintered body for tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a 2[--
The present invention relates to a sintered body for implements.

Conventional, diamond or standing JJ product type nitride fillll
The sintered body containing the element and the hard material body as the matrix are directly bonded without an intermediate, or the intermediate is Zr or Ti.
It is known that these are combined as inclusions.

However, in the former case, due to the thermal contraction of the sintered body as sintering progresses and the difference in thermal expansion coefficient between the sintered body containing diamond or cubic boron nitride and the hard substance, the sintered body and the hard substance may The problem is that residual stress generated at the boundary of the body cannot be absorbed and relaxed, resulting in distortion, warping, or cracking. In the latter case, the sintering temperature when sintering the sintered body containing diamond or cubic boron nitride is 1.
200 to 1600 C, and in that temperature range Z
r or T1, respectively, reacts with carbon in the hard material body, which is a shrine, to form carbides of ZrCx and T1Cx (X<1), and by the formation of this carbide, the hard material body -
In the vicinity of the 1- layer, that is, Zr or 1-1, a brittle η phase (WICo: +C) lacking carbon is formed. However, the η phase may have a thickness of 10 to 50 μm, and stress may be concentrated in this portion during cutting, resulting in problems such as the sintered body peeling off from the hard material body 44. are doing.

The present invention has been made in relation to item 2, and is a hard material J of the base material that does not cause distortion, warping, or cracks.
Another object of the present invention is to provide a high-hardness sintered body for tools that has a long life and is free from defects such as peeling of the sintered body containing diamond or cubic boron nitride.

The present invention combines a sintered body containing diamond or cubic boron nitride with one or more carbides, nitrides, or carbonitrides of 4"+5a+6a of the periodic table and Fe, Co, and N.
i, Ti, Zr at the joint part of the composite sintered body joined with a hard material body made of one or two of W, Mo, and Cr.
1 carbide, nitride or carbonitride layer or multi-layer
~20 μm is formed, and further 1 of Zr or T1 is formed.
1. A high-hardness composite sintered body for implements in which a layer with a hardness of less than 0.5 rrnn was formed.

Examples of the present invention will be specifically described below.

Figure 1 shows the high hardness sintered body for tools of the present invention.
1 is one or more carbides, nitrides, or carbonitrides of group 43 + 52, 6a of the periodic table, and Fe +
A hard material body made of one or more of Co, N1 + W + Mo + Cr, etc., and 2 is a carbide, nitride, or carbon of T1 or Zr formed on the surface of the hard material with a thickness of 1 to 20μ. A layer made of nitride, the layer is made of C
VI) or on the desired surface (at least the bonding surface) of the hard material body by PVD method. 3 is a layer of Zr or T1 with a thickness of less than 5 mm, which may be plate-like or vapor-deposited; From OJ pry, -1- is preferred. 4 is a sintered body containing diamond or cubic boron nitride.

-1- Among the sintered bodies 4 described above, in the case of Tiremon 1-,
60-90% by volume of diamond powder with Fe and Co
, powder of type 1 plate-1- among iron group metals such as Ni is added, thoroughly stirred and mixed in a ball mill, and sintered.
In the case of cubic boron nitride, Ti, Zr, If, Ta, and S are added to 30 to 70 volume % of cubic boron nitride powder.
i, W (D nitride, carbide or carbonitride and A#20
69 to 1 powder of one type or a mixed powder of two or more of 3.
6 volume% and An + Fe + Co + I'J+
It is obtained by sufficiently stirring and mixing a mixture of 1 to 15% by volume of one type of powder or a mixed powder of two or more types of + S 1 and then sintering.

The following materials are placed in a reaction vessel as shown in Figure 1, and the vessel is exposed to ultra-high pressure and high temperature to sinter. A composite sintered body for a tool was obtained by combining the body and the hard material body. This composite sintered body shows no distortion, warping, or cracks, and in the case of actual diamonds, a pressure of 55 to 65 kbar and a temperature of 1,400 to 1,600°C is applied, and in the case of cubic boron nitride, it is 50 kbar pressure and 1200-1
The test was carried out at a temperature of 400'C.

Next, the reason for doing so will be explained.

By coating the surface of the hard material body 1 with a layer 2 made of carbide, nitride, or carbonitride of Ti or Z[, it is possible to prevent the generation of η phase between the hard material body and the layer and to achieve strong adhesion. At the same time, it also reacts with the Zr or Ti layer 3 during sintering to firmly adhere.

As for the thickness of layer 2, if it is less than 1 μm, it will not be effective in preventing the formation of the η phase, and if it exceeds 20 tt, stress will be concentrated in this part, causing peeling, which is not preferable.

In addition, by interposing the Zr or Ti layer 3, it has excellent gas absorption properties, that is, it absorbs and solidly dissolves the adsorbed gas of the sintered body raw material powder and the generated gas generated during sintering 111,
It promotes sinterability and has excellent mechanical properties, that is, absorbs and relieves residual stress after sintering, and prevents distortion, warping, or cracking.

If the thickness of the layer 3 is less than 0.01ffff, the effect of absorbing and relaxing the residual stress at the boundary will be insufficient, and distortion, warping, or cracks will easily occur, and this will cause the Q
If the thickness exceeds 5 mm, absorption and relaxation of residual stress will be sufficient, but problems will arise in terms of the rigidity of this composite sintered body, which will cause chatter and chipping of the cutting edge during cutting. It's easy to become.

Examples will be described below.

Example 1 Diamond with an average primary particle size of 3 μm) powder 90 pieces M%, 3
A mixed powder containing 10% by volume of Co powder of 25 mesh F or more was mixed in a ball mill for about 35 hours and used as a raw material.

A hard material disk coated with 10 μm of TiC in a zirconium reaction vessel (thickness: 2.0 mm, diameter: 15.54
), about 0.6 g of the above raw material powder was placed thereon, and a reaction vessel was set.

After that, the ultra-high pressure and high temperature generator (held type) was installed at 60
After sintering by holding at kilobar and 1500° C. for about 30 minutes, the pressure was removed by cooling.

In the composite sintered body thus obtained, the diamond-containing sintered body and the hard material are firmly bonded through the i'i plate and the 1゛IC layer, and there is no distortion, warpage, cracks, or η phase. It was a composite sintered body.

1. Place the composite sintered body in the corner of a 544E-W2E carbide indexable tip with wax f: 1, and use this tip to prepare a 20% 5i-A6 alloy (300X500, II
A groove of 20×50 depth was cut intermittently in the longitudinal direction of the outer periphery of the grain. The cutting conditions at this time were V = 500,
, , /, month u, r=0. ]1 old ++/+' e IJ,
d = i, Q dry cutting.

The second test results were that the flank wear after cutting 60 = ..II++ was 0.06 mm, and the flank wear after cutting 120 = ..l was 0.011 ff. Further, during this test, no defects such as chipping or chipping occurred on the cutting edge of the composite sintered body. Furthermore, layers 2 and 3 firmly adhered the sintered body 4 and the hard material body 1, and no peeling or cranking was observed.

Example 2 75% by volume of cubic boron nitride powder with an average primary particle size of 5μ,
AlhO3 powder with an average primary particle size of 1μ 15 Powder 5th volume 5
8% by volume of A44 powder below mesh and 2% of S1 powder
A mixed powder consisting of the above was mixed in a ball mill for about 50 hours, and this was used as a raw material.

A hard material body (thickness 2.5 mm, diameter 17.2 mm) coated with 15μ of i'' i N was placed in a titanium reaction vessel, and on top of this was placed a Z1 degree with a thickness of Q, 2trtm and a diameter of 17.2y+m. A plate was placed, and about 0.81% of the raw material powder was filled thereon, and a reaction vessel was set.

After that, using an ultra-high pressure and high temperature generator, 45 kilobar,
After sintering at 1300° C. for about 1 Qntin, the temperature and pressure were removed.

In the composite sintered body obtained by the process described above, the sintered body containing cubic boron nitride was firmly adhered to the hard material body via the Zr plate and the -['' i N 11'7i. There was no η phase at the boundary between the layer and the hard material body, and a composite sintered body without distortion, warpage, or cracks was obtained.

The above composite sintered body was soldered to the corner of a 5NG433 carbide indexable tip, and this depth was used to make an IJ I of hardened steel (SKD61, II + < C55).
Intermittent milling of OQ my x length 250mm x height 5Q#m was performed. The cutting line ('I is \l = l
Q Q n+ / +++ i II, f: Q, Q
5 11111+7/1' C11, +l =0.3
It is a dry cutting method.

Therefore, the result of L is l Q Q + IIi I + flank H wear after cutting 0. l yzm, 200 mi, flank wear Q after cutting was 2mm, there was no chipping or chipping during this period, and the adhesion between each layer was strong and there were no problems (
There was no J.

Example 3 When adhering the sintered body 4 containing diamond or cubic boron nitride to the hard material body 1, the layers 2 and 3 were coated with various materials as shown in Table 1 according to Example 1 and Example 3. Example 2 and Example 5 were manufactured using the same method and tested as in Example 5.

Table 1 The test results showed normal flank wear similar to the examples described in 111f and 1iif, and the hard material bodies were firmly adhered through each layer 2 and 3, and the hard material body 1
There was also no η phase at the interface between layer 2 and layer 2.

Moreover, no distortion, warpage, or roughness was observed in these composite sintered bodies.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the composite sintered 14 of the present invention (1υrili7). 1-m-hard material body 2--one layer 3--one layer 4-m
- Sintered body patent applicant Daijit - Lgyo Co., Ltd.

Claims (1)

[Scope of Claims] (], 1 A sintered body containing diamond or cubic boron nitride is combined with one or more carbides, nitrides, or carbonitrides of groups 4a, 5a, and 5a of the periodic table. Fe, Co
, Ni, W, Mo. A single or multiple layer of Ti, Zr carbide, nitride, or carbonitride is formed in a thickness of 1 to 20 μm at the joint of a composite sintered body joined to a hard material body made of one or more Cr. A high-hardness composite sintered body for a tool, further comprising a layer of Zr or T1 with a thickness of less than 0.5 mm.