JPS5941432A - Sintered al alloy useful as sliding member - Google Patents

Abstract

PURPOSE:To obtain the sintered Al alloy useful as a sliding member excellent in self lubricativity, burning resistance and conformability, by uniformly dispersing the specified amount of a lubricative component comprising one or more of graphite, lead, MoS2, WS2, Cu2S and BN in Al. CONSTITUTION:The composition of the sintered Al alloy useful as a sliding member is made as follows; by wt%, 0.5-30 a lubricative component comprising one or more of graphite, lead, MoS2, WS2, Cu2S and BN, and the balance Al and inevitable impurities. A powdery raw material having said composition is formed into a compressed powdery body under predetermined pressure and then sintered under pressure in the gaseous atmosphere of decomposed ammonia, for instance, to form the structure that said lubricative component is uniformly dispersed in the Al matrix. Further, 0.2-20 a matrix-strengthening component comprising one or more of Cu, Mg, Si, Sn and Zn, or 0.2-20 a wear resistance- improving component comprising one or more of Fe, Ni and Cr may be added in addition to said lubricative component at need.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides self-lubricating properties, seizure resistance, and conformability (
These properties are hereinafter collectively referred to as sliding properties) [This article relates to a sintered AI1 alloy that is particularly suitable for use as a sliding member that requires these properties.

Conventionally, heavy oil-impregnated sintering has been used to manufacture sliding parts such as absorbers for vehicles and drive equipment, sliding members for automobile doors, vanes, rotors, and casings of various pumps, and piston rings for vehicles. Although Fθ alloys and the like are used, in today's society where energy conservation is discouraged, there is an increasing demand for weight reduction for these sliding members.

This invention provides a paulownia wood material that makes it possible to reduce the weight of the above-mentioned sliding member.
Lead (hereinafter referred to as Pb), molybdenum sulfide (hereinafter referred to as MO82)
), tungsten sulfide (hereinafter referred to as FWS2),
Copper sulfide C (indicated by 0u2S below).

and nitriding? Contains 0.5 to 30% of one or more lubricating components of borosilicate (hereinafter referred to as BN), and further contains *C! u, Mg, Si, S
20, 2 to 20, and one or more of Fe, Ni, and Or to improve wear resistance, 20, 2 to 20.
It is characterized by a sintered A2 alloy having a composition in which the lubricating components are uniformly dispersed in the matrix, and a composition in which the lubricating components are uniformly dispersed in the matrix, and the remainder is M and unavoidable impurities. The weight is reduced by the A1 alloy base material, and excellent lubrication properties are ensured by the above-mentioned lubricating components.

Next, the reason why the composition range of the sintered AQ gold alloy of the present invention is limited to the above-mentioned range will be explained.

←) Lubricating components These components have the effect of uniformly dispersing in the matrix to form a dispersed phase, thereby imparting excellent lubricating properties to the alloy, but if their content is less than 0.5%, the desired lubricating properties may not be achieved. However, if the content exceeds 30%, the strength of the alloy will drop significantly, so the content was set at 0.5 to 30%.

(b) Ou, Mg, Si, Sn, and Zn
These components have the effect of generating a liquid phase at low temperatures during sintering to improve sinterability, and also strengthen the matrix by alloying with the M of the base material, so they are used when these properties are required. It is included if necessary.

If the content is less than 0.2%, the desired effect of improving the above function cannot be obtained, while if the content exceeds 20%, the weight reduction of the alloy will be impaired. Therefore, the content ff: It was set as 0.2 to 20 sections.

(C) Fe, Ni, and Or These components have the effect of uniformly dispersing into the substrate and improving the abrasion resistance of the substrate, so they may be included as necessary when particularly abrasion resistance is required. However, its content is 0
．． If the content is less than 2%, the desired effect of improving wear resistance cannot be achieved, while if the content exceeds 20%, not only will the strength of the alloy decrease, but it will also be difficult to achieve the desired weight reduction. Therefore, its content 'i 0.
It was decided that there would be sections 2 to 20.

Next, a sintered AQ joint according to the present invention will be explained in detail with reference to embodiments.

Example raw material powder was AQ powder with particle size: 200 mesh.

Both are the same 100 mesh flaky graphite (C) powder, PB powder, MoS, 2 powder, WS2 powder, C
! u2S powder and BN powder, both the same 200
Mesh AQ-Cu alloy powder (Cu: 30 weight coefficient content), Mg powder, AQ-Ou -Si -Mg alloy powder (
By weight, Ou near%, Si: 2 parts, Mg: 2 parts contained], AQ-Mg alloy powder (Mg: 25 parts contained)
, and An-Si alloy powder (contains Si: 30% by weight)
, the same 150 mesh electrolytic Cu powder.

Both are the same 100 mesh Sn powder, Zn powder, A!・Mize Fθ powder and Fe-Or alloy powder (contains Or near 0 weight coefficient), and the same 350 mes
N1 powder of h.

Prepare the same 100 mesh Cr powder, mix these raw powders to the composition shown in Table 1, mold them into a green compact at a predetermined pressure within the range, and then add ammonia to the green compact. 2 Kg/in decomposition gas atmosphere
Sintered M alloys 1 to 1 of the present invention having substantially the same composition as the blended composition are produced by heating and holding at a predetermined temperature within the temperature range of 500 to 650°C and sintering while applying a pressure of No. 19 were produced, respectively.

Next, the resulting sintered An alloys 1 to 19 of the present invention
The density and transverse rupture force were measured, and a constant speed friction tester was used to measure the specimen shape: 25 mm' x 10 valves, surface pressure: 5 Kg/ctl, friction speed: 6.8 m/sec, friction time: 5 hours, oil immersion: reed, mating phase = s45C! (Rock wool hardness C scale as a tempered material): 35-45) A friction sliding test was conducted under the conditions of using 2 test pieces/time, and the wear depth and friction coefficient were measured. These measurement results are also shown in Table 1. For the purpose of comparison, Table 1 also shows the test results of a commercially available oil-impregnated sintered Fe alloy (hereinafter referred to as conventional oil-impregnated sintered Fe alloy) under the same conditions.

From the results shown in Table 1, 1 the present invention sintered AA alloy 1-1
It is clear that, although they are all light, they have excellent sliding properties comparable to heavy conventional oil-impregnated sintered Fe alloys.

As mentioned above, the sintered AA alloy of the present invention has excellent sliding properties, so it exhibits excellent performance over a long period of time, especially when used as a sliding member in various industrial fields.

Applicant: Mitsubishi Metals Corporation Agent Tomi 1) Kazuo and 1 other person

Claims (1)

[Scope of Claims] (1) Contains a lubricating component of 20.5 to 30% of one or more of graphite, lead pentamolybdenum sulfide, tungsten sulfide, copper sulfide, and boron nitride. Composition where the remainder consists of AA and unavoidable impurities (weight%)
, and a sintered A9 alloy for sliding members, characterized in that it has a structure in which the lubricating component is uniformly dispersed in the matrix. cutting) graphite, lead, molybdenum sulfide, tungsten sulfide,
Copper sulfide and nitride contain 20.5 to 30% of one or more lubricating components of boron, and further contain Cu,
Contains one or more base strengthening components of Mg, Efi, Sn, and Zn: 0.2 to 20%,
The remainder consists of A2 and unavoidable impurities (this is the weight)
A sintered A1 alloy for a sliding member, characterized in that it has a structure in which the lubricating component is uniformly dispersed in the substrate and the substrate. (3) Graphite, lead, molybdenum sulfide, tungsten sulfide,
Copper sulfide and nitride contain one or more lubricating components of boron: 0.5 to 30%, and further contain Fe, N
Contains 0.2 to 20 wear resistance improving components of one or more of i and Or. The remainder consists of AA and unavoidable impurities (weight Ll
)), and a sintered A1 alloy for sliding members, characterized by having a structure in which the lubricating component is uniformly dispersed in the matrix. (4) Graphite, lead, molybdenum sulfide, tungsten sulfide,
Copper sulfide and nitride contain one or more lubricating components of boron: 0.5 to 30%. Further Ic Cu, Mg, Si, Sn, and Zn
One or more of the following base strengthening ingredients: 0.2~
20, and one or more wear resistance improving components 20.2 to 20 of Fe, Ni, and Cr, and the remainder consists of AQ and inevitable impurities ( A sintered A1 alloy for a sliding member, characterized in that it has a structure in which the lubricating component is uniformly dispersed in the matrix.