JPS60251264A - Sliding member - Google Patents

Abstract

PURPOSE:To present a sliding member superior in wear resistance, less aggressive against the opposite material by plasma spraying mixed powders of Mo powder, Fe-P and Fe-P-C alloy to the sliding surface of a metallic member. CONSTITUTION:The mixed powder composed of 4-40wt% Mo powder, and one kind of the Fe alloy powder contg. 0.5-15% P and the Fe alloy powder contg. 0.5-15% P, 0.2-5% C is plasma sprayed to at least one part of the sliding surface of the metallic member to form the sprayed layer. On further, one kind from Fe-C-Cr alloy powder, Fe-Ni alloy powder is contained in the sprayed alloy. The sliding member has low baking and wear properties, decreased aggressive property against the opposite material, and superior in corrosion resistance, heat resistance, adhesive property, etc., the spraying member is inexpensive. The member is suitable for parts such as piston ring, cylinder bore, piston, air compressor, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sliding member, and more particularly to a sliding member whose sliding characteristics are improved by plasma spraying a thermal spray material onto the sliding surface. It is.

(Prior art) The sliding surfaces of various mechanical parts used in internal combustion engines, such as pistons, piston rings, cylinder bores, piston rods, near compressor parts, shift forks, and synchronizer Il rings, are extremely 1. <Friction i”+,
2) Excellent sliding properties such as wear resistance and seizure resistance are required. For this reason, conventionally, when using full-thickness materials such as ferrous or non-ferrous alloys, a material with excellent forward dynamic properties was sprayed by plasma spraying etc. on the surface of the member formed from the Kinro material to improve the sliding properties. Conventionally used thermal spray materials include, for example, molybdenum (
Mo), iron-chromium (Fe-OrL iron-carbon (Fe-(
1,80; carbon content 08% by weight), alumina tinia (Al203-TM01), and the like.

(2) When using the above-mentioned conventional thermal spraying material, there was a point of relapse such as under the stomach. That is, in Mo thermal spraying, Mo is easily converted into ha in the high temperature atmosphere during thermal spraying. F
'e-Or thermal spraying has excellent abrasion resistance of the thermal spraying material itself, but it is aggressive towards the other material and easily wears out the other material.Also, the Fe-+1.8C thermal spraying I/'i thermal spraying material itself AI 203 Ti0 has a problem with wear resistance.
Thermal spraying using ceramic powder, as represented by 2 thermal spraying, has excellent abrasion resistance, but it is highly aggressive towards the other material, so it easily wears out the other material, and it is difficult to obtain sufficient adhesion to the metal base material. However, parts that are subjected to shock loads, vibrations, etc. are easily separated from the metal base material.

(Problems to be Solved by the Invention) The present invention is intended to solve the problems in the prior art described in the following, and its purpose is to ensure that the thermal sprayed material itself has excellent wear resistance and is resistant to attack against opposing materials. The object of the present invention is to provide a sliding member which is plasma-sprayed with an inexpensive thermal-sprayed material that has excellent properties such as corrosion resistance, heat resistance, seizure resistance, and adhesion.

(Means for solving the gap N point) That is, in the sliding member of the present invention, molybdenum powder of 4 to 40% by weight based on the total amount of powder and 0.5% of phosphorus are added to at least a part of the sliding surface of the metal member. Iron containing 15% by weight
O characterized by plasma spraying a mixed powder having a composition of a phosphorus alloy powder, 0.5 to 15 times phosphorus, and one kind of iron-phosphorus-carbon alloy powder containing 0.2 to 5% by weight of carbon. Furthermore, the mixed powder may further include one of iron-hb-s-chromium alloy powder and iron-nickel alloy powder.

Molybdenum (MO), phosphorus (
The content of P) and charcoal* (0) is determined by considering the balance of various physical properties such as wear resistance and aggressiveness against mating materials, and determines the composition of each powder so that the content is suitable.

The thickness of the sprayed layer is also selected depending on the alloy composition to be sprayed, the glaze of the sliding member, and the required properties, but it is preferably about 200 μm after polishing. The average particle size and particle size of each powder. The distribution is optimally selected in consideration of the plasma spraying conditions and the composition of the mixed powder.

(Example of Actual Fabric) The present invention will be explained in further detail in the following examples. Note that the present invention is not limited to the following actual examples.

Suzaku Example 1: Molybdenum powder of 20 Mft% based on the total amount of powder and 81
A mixed powder having a composition of 11% by weight of Fe-IP-10 powder was plasma sprayed on the contact surface of the rotating test piece (8, 45) to a thickness of 100 μm after polishing and finishing. A test piece for performance evaluation was manufactured.

Example 1 Example 2 to 4 'μ Tsumugi Using the same method as Example 1, the proportion of molybdenum powder was changed to 5.
7) O Comparative Example 1: The rotation was applied to the contact surface of the fastening piece with the thermal sprayed layer of Example 1. Comparative Example 2: A sample of 625% chromium, 7% carbon, and the remainder iron, was made by electrolytically applying chromium (Or) to the same thickness.
An M specimen having a sprayed layer of the same thickness was manufactured in the same manner as in Example 1 using high carbon Fe-Cr alloy powder.

Comparative Example 3: A test piece with a sprayed layer of the same thickness as in Example 1 was fabricated by gas spraying using molybdenum (Mo) Performance comparison trial: '1! The same rotary Fr≠) pieces with various surface treatments of Leprosy Examples 1 to 4 and Comparative Examples 1 to 3 were used as a mating member PC73 (
A fixed sample of graphite #iron) was installed in contact with the mower, and motor oil 5AE10 W-30 was supplied as a lubricant to the contact surface, and the rotation speed was 111 (maximum 15nl1 at 10 rpm).
A seizure test was conducted up to kg. The results for the learning member of the present invention are shown in FIG.

As is clear from 4, by adding a weighted amount of MO, a seizure load of 5110 kg was obtained, which was the same as that of the MO sprayed material, and the seizure resistance of C.
kg, which is higher than the 425 kg of high carbon Fe-0r thermal spray material.

A. For Figure 2, do the same as above, but change the rotation speed to l61'
1 shows the wear weight of the learning member itself of the present invention when a one-hour wear test was carried out with the l rpm % load constant at 6r1 kg. The wear weight of the comparison materials under the same conditions is 5 mg for the Or plating material, 7 mg for the Mo sprayed material, and 2 mg for the high carbon Fe-Or sprayed material. Also in the present invention material, by adding 10 to 3 ONLt% of Mo, high #blue re-Or
Provides excellent wear resistance equivalent to thermal sprayed materials.

In the flexible member of the present invention, the Mo content in the thermal spray material is 4
Under Ichi 111, the effect of improving seizure resistance and wear resistance is slight, and the desired effect cannot be sufficiently obtained. Further, if the Mo content is too high, problems arise in terms of adhesion, thermal spraying workability, and cost, so the preferred range is 4 to 40% by weight.

Regarding seizure resistance, the higher the Mo content (21), the better (almost constant with an increase in weight %), but the wear resistance is better than IO
Optimum is 30% to 30% by weight. Also, the content of P is 0.5
Below 131% by weight, the abrasion resistance is insufficient and the stamping ability is also poor, resulting in high powder cost. On the other hand, if the P content is too high, adhesion and thermal spraying workability will deteriorate, so the preferred range is 0.5.
or 15% free time. Corrosion resistance is excellent when the P content is high, and 6% crucible-F is particularly good. C content ke 0
If the C content is less than 96, the hardness increasing effect will be insufficient and the effect of improving wear resistance will hardly be expected, so it is preferable to increase the C content to 021% or more.On the other hand, if the C content is too high, the hardness will increase. If it is too high, the abrasion resistance will be excellent, but the aggressiveness against the mating material will be large, and the adhesion and thermal spraying workability will be poor, so the preferred range is 0.2 to 5% by weight.

- Even when iron-carbon-chromium alloy powder or iron-nickel alloy powder is used in combination with iron-carbon-chromium alloy powder or iron-nickel alloy powder, it retains the effect of adding molybdenum and phosphorus, and has a sprayed layer that gives the effect of adding chromium and nickel to the song. In addition, an electric member can be obtained.

(Effects of the Invention) - As mentioned in F, the sliding member of the present invention is an iron-based metal member containing molybdenum and phosphorus or molybdenum, phosphorus, and carbon in an appropriate ratio of R in at least a part of the sliding surface of the metal member. Because the thermal spray layer is formed by plasma spraying, it has less seizure and abrasion properties, and is less aggressive to the mating material, so it has excellent overall properties, and is different from conventional sliding members with various thermal spray layers. For example, it is cheaper than Mo sprayed material, and has excellent wear resistance and
The adhesion and heat resistance are improved, and compared to the Fe-0r sprayed material layer and the ceramic sprayed material, it is possible to reduce the attack property of the mating material while maintaining the same wear resistance. By eliminating the shortcomings and making use of its great advantages, we have improved wear resistance and durability when used in various sliding parts such as piston rings, cylinder bores, pistons, near compressor products, piston rods, shift forks, synchronizer rings, etc. It has the effect of improving various physical properties such as seizure resistance, corrosion resistance, and heat resistance.

[Brief explanation of the drawing]

Fig. 1 is a graph showing the change in seizure load when the molybdenum content of the thermal sprayed material is changed in the sliding member of the present invention, and Fig. 2 is a graph showing the change in the molybdenum content of the thermal sprayed material in the sliding member of the present invention. It is a graph showing a change in the abrasion weight of a sliding member when it is changed. Patent applicant Toyota Motor Corporation

Claims (1)

Scope of Claims (11) Molybdenum powder in an amount of 4 to 40% of the total amount of powder on at least a part of the driving surface of the metal member, and phosphorus 05
A composition consisting of a part of an iron-phosphorus alloy powder containing 0.5 to 15% by weight of phosphorus, 0.5 to 15% by weight of phosphorus, and 0.2 to 5% by weight of carbon. A sliding member characterized by plasma spraying a mixed powder of. (2) In the above, the sliding member according to claim 1, wherein the mixed powder further contains one of iron-carbon-chromium alloy powder and iron-nickel alloy powder◇