JPS602379B2 - Cubic boron nitride-based ultra-high pressure sintered material for cutting and wear-resistant tools - Google Patents

Description

[Detailed description of the invention] This invention combines excellent toughness and wear resistance,
It also has high hardness, excellent heat resistance and high temperature strength,
Especially for cutting tools that require these properties such as Ni-based or Co-based super alloys and high-speed steel, and for wear-resistant tools such as bearings and wire drawing dies. This paper relates to crystalline nitride shelbase-based ultra-high-pressure competitive mackerel materials.

In recent years, cubic nitride terrace-based ultra-high-pressure agglomerated materials (hereinafter abbreviated as CBN-based agglomerated materials), which have extremely superior wear resistance compared to tungsten carbide-based sintered twill materials, have been used as cutting tools and wear-resistant tools. tend to be used.

This CBN-based scale-stripe material can be roughly divided into two types depending on the binder phase of CBN particles forming the dispersed phase.
One is one in which the binder phase is composed of an iron group metal, or a metal whose main component is an iron group metal and N, and the other one is one whose main component is titanium nitride, titanium carbide, aluminum nitride, or aluminum oxide. The bonding phase is made of a ceramic compound.

However, in the former, as mentioned above, the binder phase is metal, so although it has high toughness, it is easily softened at high temperatures. Under such conditions, the abrasion resistance and adhesion resistance are insufficient, and sufficient cutting performance cannot be expected, and it can only be used under conditions where there is little heat generation, that is, where the load is low.
In addition, in the latter case, as the binder phase is composed of a ceramic compound as mentioned above, it has excellent wear resistance and welding resistance, but on the other hand, lack of rutting can be avoided. First, chipping and chipping are likely to occur under cutting conditions in which a large impact force is applied to the cutting edge, such as when milling high-speed steel. Therefore, from the above-mentioned viewpoint, the present inventors conducted research to obtain a CBN-based striation material that has both toughness and wear resistance. Zr, Ta,
and carbides, nitrides, and carbonitrides of W, and one or more solid solutions of two or more of these (
These are collectively referred to as metal carbon/nitrides): 10~
60%, Pd: 1-10%, one of Ni and Co
Contains 1 to 10% of species or 2 species, 0.5 to 10% of N, and the remainder consists of CBN and inevitable impurities.
When composed of a composition in which N accounts for 50 to 90% by volume, the resulting CBN-based deposited material has excellent toughness and wear resistance, as well as excellent heat resistance and high temperature strength. We obtained this knowledge.

This invention was made based on the above knowledge, and the reason why the component composition was limited as described above will be explained below.

[a} Metallic carbon/nitride These components have the uniform effect of promoting aging under ultra-high pressure and high temperature and significantly improving the wear resistance and heat resistance of the material, but if the content is 10 If it is less than 60%, the desired wear resistance and heat resistance cannot be secured;
If the content exceeds 10%, the ballability of the material decreases and, for example, when used for cutting, the cutting edge tends to be damaged, so the content was set at 10% to 60%.

Note that the content is preferably 20 to 40%. 'b
} Pd In addition to promoting sintering, the Pb component also improves the toughness of the material.
Improves heat resistance (high temperature oxidation resistance) and welding resistance,
As a result, it has the effect of improving wear resistance, especially crater wear resistance, but if its content is less than 1%, the desired effect cannot be obtained; The content was determined to be 1 to 10% because the abrasion properties, especially the flank abrasion properties, tend to deteriorate.

{c'Ni and Co Ni and Co components also have the effect of promoting grain set and improving the toughness of the material, but if their combined amount is less than 1%, it is difficult to secure the desired grain quality. On the other hand, if the content exceeds 10%, the heat resistance and settling resistance of the material will deteriorate, so the content was set at 1 to 10%.

{d-AIAI component has a deoxidizing effect and annealing promoting effect, and when coexisting with Pd, Ni, and Co, forms a Pd-(Ni, Co)-AI alloy as a binder phase and improves the material. It has the effect of significantly improving heat resistance, but
If the content is less than 0.5%, the desired effect cannot be obtained, while if the content exceeds 10%, wear resistance and rutting resistance will decrease. It was set at 0.5-10%.

'e- CBN volume ratio The CBN component is a component that has high hardness and excellent heat resistance, but if its proportion is less than 5% by volume, the desired wear resistance and heat resistance cannot be imparted to the material. On the other hand, if the ratio exceeds 9 muscle volume%, the ratio of CBN particles in contact with each other becomes too high, which not only causes the material to form arms, but also deteriorates the silkiness and causes fine particles to form in the material. Since pores tend to remain and cause deterioration of wear resistance, the volume ratio was set at 50 to 9% by volume.

Next, the CBN-based sintered material of the present invention will be specifically explained using examples.

Examples of raw material powders include CBN powder having an average grain size of 6 mounds, TIC powder having an average particle size of 1 flea, and TI powder.
N powder, TICN powder, ZrC powder, Z state powder, N in Z
powder, TaC powder, TaN powder, TaCN powder, WC powder, (Ti, W)C powder, and (Ti, Zr, Ta)
Metallic carbon/nitride powder consisting of CN powder, Pd powder, Ni powder, Co powder, and mountain powder each having an average particle size of 0.5 grain size as a binder phase forming component. Pd-AI alloy (AI
:20%) powder and Ni-AI alloy (AI:32
% containing) powder is prepared, and each of these raw material powders is
After blending with the composition shown in the table and mixing in a ball mill under normal conditions, it is pressed into a disc-shaped compact with dimensions of diameter: 25 mm x thickness: 1 mm under a pressure of 2 tons. By molding, then inserting these green compacts into a container of an ultra-high pressure and high temperature generator, and coagulating them under ultra-high pressure under the conditions of pressure: 5 on/, temperature: 1200°C, and holding time: 1 hour.
Ultra-high pressure binding materials 1 to 15 of the present invention and comparative ultra-high pressure binding materials 1 to 6 having substantially the same composition as the blended composition
were manufactured respectively.

In addition, comparative ultra-high pressure phosphorized materials 1 to 6 all contain one of the constituent components (those marked with * in Table 1).
has a composition outside the scope of this invention. Next, the ultra-high pressure bonded materials 1 to 15 of the present invention obtained as a result
For the purpose of evaluating the wear resistance of Comparative Ultra High Pressure Bonded Materials 1 to 6, work material: Nimonic 8 sail, depth of cut:
0.3 ribs, feed: 0.1 ribs/time, cutting speed: 50'm
In order to conduct a cutting test under conditions of 100° C. (hereinafter referred to as cutting test A) and to evaluate the cutting properties, the workpiece material: die steel (SKD
-11, hardness: HRC60), feed: 0.1 female, depth of cut: 0.05, 0.1, 0.1 f0.2, 0.2 f0. An intermittent cutting test (hereinafter referred to as "cutting test B") was conducted under the conditions of on and 0.4 kites, cutting speed: 60 m/min, and no cutting oil. In cutting test A, flank wear of the cutting edge was 0.2
The cutting time until the ribs were reached was measured, and in cutting test B, the feed rate at which chipping was observed at the cutting edge was checked.

These test results are shown in Table 1 along with the Pickers hardness. From the results shown in Table 1 of Brain Ship, it can be seen that the ultra-high-pressure solar cell materials 1 to 1 of the present invention
No. 15 all have excellent cutting performance, but as seen in comparative ultra-high pressure phosphor materials No. 1 to No. 6, when the content of any of the constituent components deviates from the scope of the present invention. It is clear that the cutting performance deteriorates significantly.

Claims (1)

[Claims] 1 Carbides, nitrides, and carbonitrides of Ti, Zr, Ta, and W, and one or more solid solutions of two or more of these: 10 to 60%, Pd: 1 to 10
%, one or two of Ni and Co: 1 to 10
%, Al: 0.5 to 10%, and the remainder consists of cubic boron nitride (containing 50 to 90 volume %) and unavoidable impurities (weight %). Cubic boron nitride-based ultra-high pressure sintered material for cutting and wear-resistant tools with abrasion resistance.