JPS6050151A - Fe-base sintered material for sliding member of internal-combustion engine - Google Patents

Abstract

PURPOSE:To provide a titled sintered material which has excellent resistance to wear and scuffing and an extremely low characteristic to attack the mating material by having structure subjected to hardening or the like dispersed finely and uniformly with mainly the hard phase of carbide having a specific area rate mainly in the martensite base of a specifically composed steel material and having a specific density ratio. CONSTITUTION:A titled sintered material consists, by wt%, of 0.5-8% Cr, 2- 5% C, 0.02-5% P, 0.05-3% Mo, 0.05-3% Mn, and 5-20% Cu or/and Sn, consists of the balance Fe and unavoidable impurities and satisfies the following conditions: Said material has the hardened or hardened and tempered structure dispersed finely and uniformly with the hard phase having 20-60% area rate and consisting mainly of carbide of M3C type in the base consisting mainly of martesite (in this case the primary crystals, etc. of Cu and Sn exist by forming a dispersion phase). Said material has >=85% theoretical density ratio. Since said material has the above-described characteristics, the material provides excellent performance for a long period of time when used for a sliding member of an internal-combustion engine used under the severe conditions of high temp. and high surface pressure.

Description

[Detailed Description of the Invention] This invention provides excellent +lIiIM structure and scuffing resistance, and extremely low opponent attack of 4%.
'a w: Yes 1. ．． 7t, 〒The service condition f/l is used at high temperature and high surface I-r.+tq When used with the sliding member of the combustion engine and L-c. This is the old version.

Since then, it has been used for the rocker arm sliding surface of internal combustion engines]
Bant moon, Kak3. A small amount of 11'e-based sintered A:1 is used in the manufacture of sliding parts for valve guides, such as h(σ1-sleep).4 On the other hand, in recent years, for example, 31j Faster and more efficient.

and high output (,', 2t'1- et al. internal combustion (sliding of the gate 7'1) 3 image usage conditions f'4 = (d
, the severity of L7 has been further increased (7), and the corresponding Fe
As the base sintered material (a) (a material on which oil was applied) was used.

However, it seems that the wear of the 2 itself is improved (・ζ, but on the other hand, the occurrence of scannoing is The current situation is that it is impossible to avoid problems and a further increase in the aggressiveness of the opponent.

Therefore, the inventors of the present invention, from the viewpoints mentioned above, 1)
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'-(l 'f of 1'l, q opko is 2Tl(1
i', 5-20th cycle, all a-what, inserted into sa0 ((T:
i, i=,,shide,■,″1°j,,Zr,to1('
, l, and Ni) of 91), one kind of ox/ko d21Φ or more ([02-s section, wo-true [L7, the remainder is Fe and unavoidable A-pure' proboscis-like composition, q (7 Pinihan and Shi7. Te-1 Rutin))・
11・Tsutomu・11. The basis of existence (Kono'hL Intermediate C: +1
4-' S rl's first product, and (:H-Sl+ '@
Money and C! u, '-5rl-, [i'o At least one of the intermetallic eutectics has a dispersed phase in the form 1jl (exists in , ), with an area ratio of 20 to 6 ( ), and 7 Te1v1
Quenching A, J5 quenching and tempering in which the hard phase consisting of type 30 carbides and double carbides is finely dispersed, preferably with an average grain size of 1[). , #11. 1 weave 7, and the theoretical density ratio is 85 or more in width [~/Kodo 0 base sintering material is immediately)' Despite this, the FG-based sintering process has been extremely low, and this FG-based sintering process has been used in the manufacture of sliding parts for internal combustion engines that are used under harsh conditions at high temperatures and high surface pressures. When using ζ (・de1guba/ko14 [ability)・remarkably 艮1 (+1), it is wisdom ν, 'f Hu.

This utterance was originally made based on ``2ki missing [1u, (/l2), and the component composition, the area ratio of the hard phase, and the theoretical density ratio were limited to below -C1 as described above ( Also, to explain the reason, 33 Δ, formed] composition (a,) The Cr0 component is dissolved in the base material Qrl', !7I to strengthen it and combine with the C component. (7) There is a small amount in the base material.
4+11 Uniform formation of carbide with high hardness 1)
7. If the content is less than 0.05 da, the desired effect is not achieved (I et al.) 7. zu, -force 8 system wo 14g-
If you have this, the partner attack"$1't or sudden(f(2J
Is it true that Sojinzu also becomes like that?
The rate was set at 13-8%. , (b) ('C component(tko姥1、me・、!1j
C, Tore 1/Reinforcement Toru t'3? (J, 1-, M
t), さL-fu ni 8', T],,, yir,
l (f, O, +, and N +) combine with the IJV component to form four carbides (including double carbon f1-) that are the main IJk component of the hard phase (-7, also -) (first 1 side j 4i 1'x
Is there an effect that causes l#11-1-1?), but that λi1
If the amount is 2/11jiJ''C, the desired effect cannot be obtained, and the force 5φ is exceeded, carbonization occurs. [fl becomes more and becomes 1,
Hard, (the ratio of 11 becomes higher than the 60th ratio at i7+i bond rate), and the attack rate increases significantly.
'(Since it becomes -, its inclusion A) Haya! f: 2 to 5% / Ko, 1 ((・) P P component K i: i, Sujun Kamoe liquid ([1 Fuji If you sinter 1-16: 1-16: direction, then 7('-I), it has the effect of improving the element, but its content is If the concentration is less than 0.02, the desired effect cannot be obtained, while if the content exceeds 5, the embrittlement of the material will become significant. %.

(d) M.

As mentioned above, the MO acid component completely forms carbides to improve the wear resistance of the base material, and also works to strengthen the base material by forming a solid solution therein. .05 e
! If the content is less than 1), the desired effect cannot be obtained, whereas if it is contained in excess of 3%, the proportion of the hard phase is too high, which significantly increases the aggressiveness of the opponent.
The content 'f 0.02 ~; 3 candy was determined.

(e) Mn The Mn component, when coexisting with MO, forms a solid solution in the base material, improves hardenability, contributes to improving and strengthening the toughness of the base material, and improves resistance by forming all double carbides. In addition to improving wear resistance, it has the effect of improving conformability and alleviating the aggressiveness of opponents, but if its content is less than 0.05%, the desired effect cannot be obtained; If the content exceeds J, the hardness of the hardening property I- will be higher than that of J:Runosoike, and the opponent's attack ttg will be distorted, so the content will be 0.05 to 3. The person in charge was appointed as the person in charge.

(') Cu and Sn In addition to solid solution in the base material to fully strengthen it, Cu and Sn also contain primary crystals of CII and Sn, as well as Cu-Sn alloys and C
jl ZI I)) from at least one of the eutectics of the 1i-Sn-11'0 alloy! The presence of this dispersed phase improves the thermal conductivity of the material, suppressing the temperature rise of the sliding surface. It has the effect of improving scuffing properties, and also has the effect of ensuring compatibility with the opponent and further suppressing aggressiveness, but its content,
If the content is less than 5 candies, the desired effect cannot be obtained, and on the other hand, even if the content exceeds 20 candies, the effect of improving the layer will not appear due to the above action. hand,
Its content is determined to be between 5 and 20 in total.

(gI V , Tj, , Hf, Zr, and Jvb
When these components coexist with Or and Mo components, they form double carbides, which have the effect of further improving monthly wear resistance, so they are necessary when particularly excellent wear resistance is required. However, if the content is less than 0i, the desired effect of improving wear resistance cannot be obtained, while if it is contained in more than 5, the aggressiveness of the opponent will increase rapidly. , its content fi 0.1
It was decided that it would be Section 5.

B. Area ratio of hard phase The feed of the present invention consists of a matrix made entirely of mardensite, which has a relatively high Vickers hardness of 400 or more, which is a quenched or quenched/tempered structure, and a matrix containing fine grains in this matrix. , desirably has an average particle size of 10 to 50 μ7n, is uniformly dispersed, and ensures excellent abrasion properties due to the hard phase mainly consisting of carbides of the M2C type carbide and double carbide, while Primary crystals of Cu and Sn, Cu-Sn alloys and Ou exist as dispersed phases in
The -Sn-Fo gold alloy eutectic ensures excellent rigid scuffing properties and compatibility with the mating member. However, in order to ensure the desired excellent wear resistance, it is necessary to set the ratio of the hard phase that has the greatest effect on wear resistance to an area ratio of 20% or more. If the ratio exceeds , the aggressiveness of the opponent will increase rapidly, so unless the ratio of the hard phase is set to an area ratio of 20 to 60, iL will not be outstanding.

If the theoretical density ratio of the material C is less than 85 tl, large pores will exist in the hole, making it impossible to ensure sufficient strength. The notch effect of the material makes it easier to destroy the base material and cause pistoning wear, so the theoretical density ratio was set to 8.
It is set as 5 or more candies.

Next, the present invention will be specifically explained using a toll rate embodiment.

Examples of raw material powders include M-to-Omesh (Mn: 0.6%, MO: 0.3 q6-containing) powder, atomized Fe-Or-Mn-Mo alloy (
C! r: 1%, Mn: Q6%, M.

:0.3%) powder, atomized Fθ-Or-Mn
-M.

Alloy (Cr: 6%, Mn: 0.6%, Mo
: 0.3% powder), further particle size -350m
esl] Fe-P alloy (p: 17% content) powder, same 250meGh Fo-P alloy (P: 27.5% content)
Powder, same 35 (] Mesh Mo powder, same 20
0 mesh Cu powder, same 250 mesh Sn powder, same 200 mesh Fe-Mn alloy (Mn゛78
Contains powder) Particle size -100mesh F
e-V alloy (V: 60% content) powder, Amize Ire
-Or-Mo-V alloy (Cr: 3%, Mo:
0.3%, V: 0.3% content) powder, Fe-Or-
MoFe-0r-alloy (Or: 4%, Mo: l
%, Mn: 0.8%, Zr: 0.5%)
Powder, Fe-Tj-alloy (T:i, : 40%
Fe-Or-MoFe-0r-alloy (Or: 4%, MOL %, Mn: o, s %,
Hf: 1%) powder, Fe-NI) alloy (Nb:
80% containing) powder and graphite powder with an average particle size of 10 μm were prepared, and these raw material powders were blended into the composition shown in Table 1, and zinc stearate: 05% was added as a moisture 2tJ agent. After mixing in a mold mixer, 3 to 6
The green compact is press-formed at a predetermined pressure within the range of 1,000 to 1,200°C in a total vacuum, and at a predetermined temperature within the range of 1,000 to 1,200°C.
In the case of vacuum sintering, sintering is performed under the condition of holding for 0 minutes, and after sintering, forced cooling and quenching is performed from a predetermined temperature within the range of 900 to 1100 ° C. In the case of extremely reducing atmosphere sintering, d: After sintering, quenching is performed by oil cooling from a predetermined temperature in the range of 800 to 1000°C in a cooling atmosphere (/rC, therefore, the material of the present invention has substantially the same composition as the compounded composition). All of Comparative Materials 1 to 30 and Comparative Materials 1 to 15 were manufactured.

In addition, for Comparative Materials 1 to 15, at least one of the component composition, hard A-grain area ratio, and theoretical density ratio (+1 marked with * in Table 1) is out of the scope of the present invention. It was manufactured under the same conditions.

Next, the area ratio of the hard phase, the theoretical density ratio, and the Vickers hardness were measured for the resulting invention materials 1 to 30 and comparative materials 1 to 15, and
1 push on the butt side of the t-1 of the t-1 (2 to 1 iL, depth) 1', A money, ``-1 Nokaa-no-no-ji 5-zo 1
1) wrapped in +C'J, resulting in 11 tons of A-e alloy Roso'car-j'-No.
, 7ji yv'C including silk, use fil oiy'', L
', P C + inferior 1'c M, li 1 rotation number 850
r, p, m, , 11.1 hours of operation, 200 hours J¥ 7mm + 4- test was conducted, and the above 1000mins (・
] maximum (Hy, depth and opponent part I (taru chill place) (
lI to Ml”.

(-ta caste loss 1 ('ka) (eyebrow) ♀' Jni and success is 0
Section 33, S].

2%, Mn: 0.74. Cr: 0.5%, white r: (15%, F.

], ・Yopi] Unnecessary Avoidance-1 Pure Matter The hardness of the part was measured at all depths of the crystals of Hysokase r1 and 480). These "1] definite results 4th 2nd
ノ〈shown in 1-.

The results shown in Table 2 [:
[~30%, Izufi-Mo1 Gravity/This wear resistance is 41'
L, there is no scuffing, and the opponent's familiarity with ('1.: 11ζ) is -17 and the opponent's aggressiveness is low at -17, whereas in comparison 4 ``A 1 to 15 to 17:,), the component content of the constituent components, hard Hpt
The curvature of +11 and the difference in the density ratio of 1
This condition is the scope of this invention! J1° outward from tl, at least one of the above Wfl''!1711
'] would be inferior. Na”
,.--In the first embodiment, 1. +:) J Uranaka's CU and 8 ↑) Ingredient '5=, Original]・-1 Mixed with powder and 7 is high.
When sintered, it is mentioned in -), but after sintering, it is
(-koi senin ni ni (・de yori ii 1 let me do it), igoto (l; 1, of course.

-1,,'vE, this invention t)) Fe-based sintering publication 11 C, I゛gunoshiko resistance F%% ball 1〈1 and surface 1 scuffing F1〉 Schiff, or te) Authored by Aizencho Chiju 1'1 [5,〈Because there is a low-C, it is harsh on the eyebrows: f Practical Kaneko 1 Unreasonableness 71 is growing ter) J'f
[Sliding parts of internal combustion engines such as 1 internal combustion engine, leapfrog, 1 natural O', 1 high lead power solinki, 1° J' O gas] Excellent also when A is used - Cm 111. ability%,
' J% periodic F-:, ', -L) i a Exerting part 1, 1] i5 Applicant H Ryo Metal Co., Ltd.

Claims (2)

[Claims] (1) Cr: Q, 5-s%, C: 2-5%, P: 0.02-5%, Mo: 0.05-3%, Mn: 0.05-3%, Cu and Sn One or two of the following: 5-20%
, the composition (wt%) consisting of all of the minerals and the remainder consisting of Fe and unavoidable impurities, and a fine and uniform hard phase consisting of carbide with an area ratio of 13 of 20 to 60 in the matrix mainly consisting of marten-leaite. It has a quenched or quenched/tempered structure with a theoretical density ratio of 75 to 8'5.
1. Fe-based sintered material system for sliding members of internal combustion engines, characterized in that it has a (2) Or: 0.5-8%, 02-5 ratio, ],': 0.02-5 ratio, ↑10: 0.05-3 ratio, 1+4n: Q, 05-3%, Cu or 11 cities and 21 layers of Kobi Sn ゛5~2
Including 0 layers, and 1 of V, Ti, Zr, Hf, and Nl−+.
: : 0. '0 2 ~ 5 cracks, 1 through 1, with the remainder consisting of Fe and unavoidable impurities (wt%), and the base material is mainly martensite, and is mainly composed of carbides with an area ratio of 20 to 60%. It has a hardened or hardened/tempered structure in which the hard phase is finely and uniformly dispersed,
and a theoretical density ratio of 85% or more.