JPS59229460A - Method for using metal of similar composition of hard sintered alloys - Google Patents

Abstract

PURPOSE:To reduce wear loss under high load and no lubrication by using hard sintered alloys each consisting of iron-base composite boride as a hard phase and a metal such as Cr, Fe, Mo, W or Ti or an alloy thereof as a binding phase in the form of a metal of similar composition. CONSTITUTION:Hard sintered alloys each consisting of 35-96% iron-base composite boride as a hard phase and the balance Cr, Fe, Mo, W, Ti, V, Nb, Ta, Hf, Zr, Ni, Cu, Co, Mn or an alloy thereof as a binding phase are combined with each other and used. The combined material has sufficient wear resistance, does not damage other material, and can show superior function.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for using iron-based complex boride hard sintered alloys (hereinafter referred to as hard sintered alloys) for the purpose of wear resistance, and more specifically, for use in high load I without lubrication. The present invention relates to a method of use suitable for wear resistance in industrial applications.

Conventionally, it has been used as a wear-resistant material (the known material is JI
So-called surface-treated materials and tool steels (JIS SK, SKD, SKH) that are made by carburizing, nitriding, or hard chromium plating on the surface of 80M tempered steel.

8KS system discount). Furthermore, WC-based cemented carbide, Tic, and TiN-based cermets are used as high-load wear-resistant members, and recently AI! 20s and ZrO
Various ceramics such as 2 are in the spotlight.

Naturally, these wear-resistant members have wear resistance due to the high hardness carbide, nitride, or oxide particles 1 contained or dispersed in the material. On the other hand, it is well known that there is a large amount of wear on the sliding mating material.

For example, hard chrome plated products and tool steel are used for typical sliding wear parts such as guides and liners for steel plates and steel wires, and when higher wear resistance is required, cemented carbide and ceramics are used. However, it also has the drawbacks of abrasion of the guide and liner, and damage and wear of the steel plate and steel wire, which are the products, although the amount is small.

Furthermore, when high-hardness alloys slide against each other, a so-called fighting situation occurs in which each member wears out the other material. Therefore, the idea is generally to sacrifice the hardness level of one of the two, intentionally wearing out one and protecting the other.

For example, when the upper and lower blades of a round blade cutter such as a slitter cutter for steel plates or a slitter cutter for magnetic tape are used with the same metal, the upper blade is made of high-hardness cemented carbide and the lower blade is made of low-hardness cemented carbide. Currently, efforts are being made to reduce the amount of wear on round blade cutters.

It is generally known that a combination of the same high-hardness materials (hereinafter referred to as co-metal) has a significantly increased amount of wear compared to a combination of different materials. Although the cause of this is not clear, it is thought to be due to the generation of highly hard wear particles on the sliding surface, which leads to an increase in the amount of wear.

Furthermore, in the wear-resistant parts of machinery and equipment, there are many shafts and bearings that cannot be used with bearings or oil-impregnated bearings due to high loads.
Currently, a brass sleeve and a steel shaft are combined, and wear resistance is achieved by forced lubrication with oil. Even in mechanical structures consisting of cylinders and pistons, oil lubrication is often applied to prevent the sliding parts from wearing out.

Oil lubrication is a conventional method to prevent wear caused by sliding friction, but the lubricating oil often stains the equipment, requires time-consuming daily inspections, and forced lubrication systems require plunger pumps to supply lubricating oil. In addition, the cost of equipment such as piping equipment cannot be ignored.

As described above, conventional materials cannot exhibit sufficient functionality to be used as wear-resistant parts.

Therefore, we conducted extensive research into a wear-resistant member that has sufficient wear resistance, does not damage the mating material, and exhibits excellent functionality, especially when used with matching metals.

The wear-resistant member of the present invention will be explained in detail below.

The present inventors have proposed this hard sintered alloy as a wear-resistant material that can provide corrosion resistance and high-temperature oxidation resistance in addition to properties comparable to the hardness, strength, and wear resistance of cemented carbide (for example, 54-27818. Special Publication No. 56-8904. Special Publication No. 56-15773).

This hard sintered alloy has an iron-based complex boride as a hard phase, and a binder phase of Cr, Fe, Mo, W, Ti, V, Nb.
, Ta, Hf, Zr.

The main component is one or more metals selected from Ni, Cu, Co, and Mn, and alloys of the metals.

The hard phase is 35 to 96%, and the iron-based complex boride hard sintered alloy has a B content of 3 to 2096, an Fe content of at least 10LX), and further contains Cr.

If one or more of Mo and W are included, the range is 0.1 each.
~50%, gate, TI, V, Nb, Ta, H
f, Zr, Ni.

When one or more of Cu, Co and Mn is included, each is within the range of 0.01 to 1596. Other elements that are unavoidably contained include AI! is 396 or less, 0 is 2.5% or less, C is 196 or less, and each element is 0.
%, but within the above range there will be no adverse effect on strength and toughness.

This hard sintered alloy is a sintered body with a true density of 10096 due to liquid phase sintering, and by changing the ratio of the amount of hard phase and binder phase within the above range, the hardness can be adjusted to a range of HR 80 to 92. It can be changed with . The hard phase is B-Fe system, B-
X-Fe system, B-X-Y-Fe system (x, y are Cr,
Mo, W, TI, V, Nb, Ta, Hf
, Zr.

borides and complex borides of Ni, Cu, Co, Mn), such as FezB, (re, Cr)
zB, MozFeB2. Mo24- (Fe, Cr)Bz, (Mo, W)z(Fe,
It exhibits intermetallic compounds such as Cr)Bz.

The binder phase can be an Fe-based alloy within the range of the metals and/or alloys mentioned above, and by adjusting the type and amount of added metals such as Cr and Ni, it can be formed into martensite, ferrite, austenite, or a mixed structure thereof. There are characteristics that can be changed.

As a result, the binder phase can be changed widely from a martensite-based tool steel structure to a ferritic stainless steel, austenitic stainless steel, and heat-resistant steel structure, so this hard sintered alloy has a high hardness. It is an excellent wear-resistant material with high strength, corrosion resistance, and heat resistance. It has a specific gravity of 8 to 8.3, which is less than 60% of the specific gravity of cemented carbide, making it lightweight and suitable for parts that dislike weight, such as rotating bodies.

Examples will be described in detail below.

Example 1゜ Table 1 shows examples of the properties of this hard sintered alloy.

Table 1 Examples of properties of the present hard sintered alloy The present hard sintered alloys shown in Table 1 were tested using the Oroja type abrasion test method. For comparison, 8US440 is a wear-resistant material.
C, Stellite alloy, and cemented carbide G-5 (HR M89) were tested. The mating material (rotated specimen) is 5KH-3 (HR M8
3) was pressed against the fixed specimen with a load of 18.9 kg, and the sliding speed was 0.2 m/sec to 4.39 m/sec.
Measurements were made at a sliding distance of 200 m in the range of e. The results are shown in FIG.

As can be seen from FIG. 1, the wear resistance does not show hardness dependence, but is significantly superior to 5US440C and Stellite alloy, and exhibits the same wear resistance as cemented carbide at the same hardness. The test results shown in FIG. 1 are obtained using 8KH-3 heat-treated material (IRc65) as a rotating specimen. Next, when this hard sintered alloy is used as a cometal, it exhibits a remarkable wear resistance effect.

That is, FIG. 2 shows the amount of wear when the rotary specimen and the fixed specimen were made of the same metal in the Oroja type abrasion test method.

Figure 2 shows the case where the fixed specimen is C40 and the rotating specimen is V2O, the fixed specimen is C40, and the rotating specimen is V2O,
When both the fixed specimen and the rotating specimen were made of V2O, good results were obtained in that the amount of wear on the rotating specimen was zero, and the amount of wear on the fixed specimen was significantly less than that of the comparison material (5US440CHRc 62). .

The reason why the combined wear-resistant material of the present invention made of the hard sintered alloy does not cause wear of the mating material is roughly explained as follows. That is, it is thought that this is due to the roundness of the shape of the complex boride particles forming the hard phase and the self-lubricating property of the complex boride. It has been confirmed by means such as a scanning electron microscope and Auger that the hard phase is a rounded particle.

7. The fact that the hard sintered alloy does not damage the mating material and that the amount of wear is significantly reduced when used as a matching material in sliding parts is due to the mechanical properties of the hard sintered alloy proposed earlier. This was discovered during various investigations into its characteristics.

When the combined wear-resistant member of the present invention was used in one round-blade slitter cutter for steel plates, it was confirmed that the sharp angle of the cutting edge was maintained for a long time and its life was significantly extended.

Furthermore, by incorporating the combined wear-resistant material of the present invention into the shaft and bearing parts of the high pressure transmission mechanism of hydraulic equipment, forced lubrication equipment, which was conventionally ancillary equipment, becomes unnecessary.
The shaft-bearing is now maintenance-free.

In addition, application to the shaft-bearings of slurry pumps for extracting manganese briquettes from the seabed, which have been attracting attention in recent years, is being considered, and the advantages of no lubrication and seawater corrosion resistance can be provided to the market. In addition, it has a wide range of uses, such as being used as a co-metal for metal seal rings.

8- As described above, the combined wear-resistant member according to the present invention exhibits excellent technical effects in the atmosphere, corrosive environments such as corrosive atmospheres and solutions, and even in non-lubricated parts under high loads.

[Brief explanation of the drawing]

Figure 1 shows the results of the Oroja type abrasion test. Figure 2 shows the wear amount of the matching metal according to the Oroja type wear test method No. ζ.

Claims (1)

[Claims] (1) The hard phase is 35-96% iron-based complex boride, the balance is Cr, Fe, Mo, ■TI, V, Nb,
Ta, Hf, Zr, Nl, Cu, Co, M
A method of using a combination of iron-based complex boride hard sintered alloys composed of a binder phase made of a metal selected from n or an alloy thereof as a co-metal.