JPH08120425A - Current collecting pantograph shoe material made of iron-base sintered alloy, having wear resistance and excellent in electric conductivity - Google Patents

Abstract

PURPOSE: To produce a current collecting pantograph shoe material made of Fe-base sintered alloy, having wear resistance and excellent in electric conductivity. CONSTITUTION: This current collecting pantograph shoe material is composed of an Fe-base sintered alloy which has a composition consisting of, by weight, 5-30% of TiSi2 and/or WSi2 as dispersed phase forming component, 0.1-5% of one or >=2 kinds among BN, MnS, and MnO2 also as dispersed phase forming components, 0.1-7% of one or more elements among Ni, Cu, and Mn as matrix forming components, and the balance Fe with inevitable impurities and further containing either or both of 0.05-3% Cr and/or Mo and 0.05-0.5% C.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention provides Fe which has excellent conductivity and wear resistance, and therefore exhibits excellent performance for a long period of time in a state where high current collecting capability is possible. The present invention relates to a pantograph sliding plate material for current collection made of a base sintered alloy.

[0002]

2. Description of the Related Art Conventionally, various kinds of Fe-based sintered alloys having a structure in which hard particles are dispersed and distributed in an Fe-based alloy base have been proposed and put into practical use as pantograph sliding plate materials for collecting electric vehicles. ing.

[0003]

On the other hand, in recent years, electric vehicles have become larger and more connected, and the speed has been remarkably high. Accordingly, as much current as possible should be taken into the pantograph sliding plate material for current collection. The characteristics that can be achieved, namely high conductivity and further improvement in wear resistance are required,
Among the Fe-based sintered alloy current collector pantograph sliding plate materials (hereinafter simply referred to as current collecting sliding plate materials) that have been proposed and put into practical use, those with excellent wear resistance have low conductivity, and conversely At present, it is not possible to satisfactorily meet these requirements because a material having good conductivity has poor wear resistance and does not have both characteristics of conductivity and wear resistance.

[0004]

Therefore, the present inventors have
From the above-mentioned viewpoint, as a result of conducting research to develop a current collecting strip material having excellent conductivity and wear resistance, the current collecting strip material is expressed in% by weight (hereinafter,% means% by weight), As a dispersed phase forming component, a silicide of Ti and W (hereinafter,
1 of TiSi ₂ and WSi ₂ respectively)
1 or 2 of hexagonal boron nitride, manganese sulfide, and manganese oxide (hereinafter referred to as BN, MnS, and MnO ₂ , respectively) as a dispersed phase forming component. Species or more: 0.1 to 5%, all of which are Ni, Cu, and M as matrix forming components
One or more of n: 0.1 to 7%, and (a) Cr and / or Mo: 0.05 to 3%, (b) C: 0, if necessary. .05 to 0.5
%, The above (a) and / or (b) are contained, and the balance is composed of an Fe-based sintered alloy having a composition of Fe and inevitable impurities, TiSi ₂ and WSi ₂ constituting the dispersed phase are As shown in Fig. 1, it has a low specific resistance similar to that of Fe, which is the main component of the base material, has a relatively high hardness, and has excellent adhesion to the Fe-based alloy base material. As a result, not only is the resulting current collecting strip material excellent in conductivity, but also BN,
The result of the study is that the excellent wear resistance is exhibited in combination with the excellent lubricity provided by MnS and MnO ₂ .

[0005]

[Table 1]

The present invention was made based on the results of the above research, and TiS was used as a dispersed phase forming component.
i ₂ and / or WSi _2: 5 to 30% as well dispersed phase forming component, BN, MnS, and one of MnO ₂ or more: 0.1% to 5%, less any matrix-forming component As Ni, Cu, and Mn, one or more of Ni, Cu, and Mn: 0.1 to 7% are contained, and (a) Cr and / or Mo: 0.
05 to 3%, (b) C: 0.05 to 0.5%, containing at least (a) and / or (b), and the balance being Fe and inevitable impurities. The present invention is characterized by a wear-resistant current collecting strip material having excellent electrical conductivity, which is configured.

Next, the reason why the component composition of the Fe-based sintered alloy constituting the current collecting strip material of the present invention is limited as described above will be explained. (A) TiSi ₂ and WSi ₂ These components have a low specific resistance close to that of the Fe component, so the inclusion of these components does not reduce the conductivity of the slab material and is maintained at a significantly high state, and the relative Since it is extremely hard, the effect of improving wear resistance is also remarkable. Therefore, the inclusion of these components makes the slab material have high conductivity and excellent wear resistance, but if the content is less than 5%, it is desirable. Wear resistance cannot be ensured, and on the other hand, if the content exceeds 30%, the strength of the contact plate material will decrease, so the content should be 5 to 3
It was set to 0%. Incidentally, the content of 7 to 20% is desirable.

(B) BN, MnS, and MnO ₂ All of these components are dispersed in the base material to improve the lubricity of the contact plate material, and thus contribute to the improvement of wear resistance. If the content is less than 0.1%, the desired lubricity cannot be imparted to the siding plate material. On the other hand, if the content exceeds 5%, not only the conductivity of the siding plate material will decrease, but also Since the strength is also reduced, the content is set to 0.1 to 5%. In addition, it is desirable that 1-2.
5% content is good.

(C) Ni, Cu, and Mn These components act as a solid solution in the matrix to strengthen it and improve the adhesion of the hard particles of TiSi ₂ and WSi _{2 to} the matrix. However, if the content is less than 0.1%, the desired effect is not obtained on the other hand, and if the content exceeds 7%, the toughness decreases, so the content is set to 0%. It was set at 1 to 7%. Desirably, the content is 1.5 to 4%.

(D) Cr and Mo These components have the function of forming a solid solution in the base material to further improve the strength and heat resistance thereof, thereby contributing to the improvement of the wear resistance of the ground sheet material. Therefore, it is contained as necessary, but if the content is less than 0.05%, the desired effect on the above-mentioned action cannot be obtained, while the content is 3%.
When the content exceeds 0.05%, the adhesion of TiSi ₂ and WSi _{2 to} the base material is lowered, and as a result, the wear resistance is lowered, so that the content is 0.05 to 3%.
I decided. Desirably, the content is 0.3 to 1.5%.

(E) The C component has a function of forming a solid solution in the base material, strengthening it, and improving the sinterability, so it is contained as necessary, but its content is 0. If the content is less than 0.05%, the desired effect cannot be obtained, while if the content exceeds 0.5%, the toughness decreases, so the content is set to 0.05 to 0.5%. I decided. Desirably 0.1 to 0.
3% content is good.

[0012]

EXAMPLES Next, the current collecting strip material of the present invention will be specifically described by way of examples. 15 as raw material powder
TiSi ₂ powder, WSi ₂ powder, BN powder, MnS powder, MnO ₂ powder, Ni powder having a particle size of 0 μm or less,
Cu powder, Mn powder, atomized iron powder having a predetermined particle size of 80 mesh or less, Fe-C
r alloy (Cr: 65% content) powder, Fe-Mo alloy (M
(O: 65% content) powder and graphite powder having a particle size of 325 mesh or less are prepared.
After blending in the blending composition shown in 3 and mixing, 6 ton /
The above compounding was carried out by press-molding into a green compact at a pressure of cm ² and sintering the green compact in an ammonia decomposing gas atmosphere at a predetermined temperature within a range of 1130 to 1200 ° C. for 1 hour. Inventive current collecting strips 1 to 17 and comparative current collecting strips 1 to 3 having substantially the same composition as the composition and having dimensions of width: 25 mm x length: 80 mm x thickness: 10 mm. Each was manufactured. It should be noted that the comparative current collecting plate 1
Nos. 3 to 3 have compositions in which the contents of TiSi ₂ and WSi ₂ constituting the dispersed phase deviate from the range of the present invention to the lower side.

[0013]

[Table 2]

[0014]

[Table 3]

[0015]

[Table 4]

An accelerated wear test was conducted on the various current collecting strips obtained as a result. The accelerated wear test was carried out by fixing the center of the motor to the horizontal axis of rotation of the motor. The disc was supported upright on the side opposite to the fixed side of the disc with an outer diameter of 2.2 m. : 5 mm x thickness: 15 mm
50 hard copper rings (JIS / C1100 / BB-H)
Using a device mounted eccentrically, the current collecting strips are pressed on both sides of the diameter line of the hard copper ring with a pressing force of 6 kg to bring the dimension surfaces of length: 80 mm × width: 25 mm into surface contact, and then the simulated trolley wire. While passing a current of 150 A between the current collector and the current collecting strip plate, the rotation speed of the disk was increased to a rotation speed of 270 km / hr in 6 minutes, held at this speed for 5 minutes, and then stopped for 6 minutes to make one cycle. This was repeated four times to measure the specific wear amount of the current collecting strip material and the wear depth of the simulated trolley wire as the mating material. The measurement results are shown in Table 4. In addition, Table 4 also shows the measurement results of the specific resistance of the current collecting strip material for the purpose of evaluating the conductivity.

[0017]

From the results shown in Tables 2 to 4, the current collecting contact strip materials 1 to 17 of the present invention are hard TiSi ₂ and WSi.
_In spite of the inclusion of ₂ , it has high conductivity in the state of low opponent attack and shows excellent wear resistance, while
As seen in the comparative current collecting strip materials 1 to 3, TiSi ₂
It is clear that the desired excellent wear resistance cannot be ensured if the content of WSi ₂ and / or WSi ₂ is out of the range of the present invention. As described above, the current collecting strip material of the present invention has excellent conductivity, wear resistance, and lubricity, and is industrially useful in that it can sufficiently respond to the remarkable progress of electric vehicles. It has a great effect.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location C22C 38/16 38/50

Claims (4)

[Claims] 1. By weight%, as a dispersed phase forming component, one or two of silicides of Ti and W: 5 to 30%; and also as a dispersed phase forming component, hexagonal boron nitride and manganese sulfide. , And one or more of manganese oxide: 0.1 to 5%, and one or more of Ni, Cu, and Mn as a matrix forming component: 0.1 to 7%. A wear-resistant Fe-based sintered alloy with excellent electrical conductivity, characterized in that it is made of a Fe-based sintered alloy having the composition of Fe and unavoidable impurities Pantograph sliding board material. 2. By weight%, as a dispersed phase forming component, one or two of Ti and W silicides: 5 to 30%; also as a dispersed phase forming component, hexagonal boron nitride and manganese sulfide. , And one or more of manganese oxide: 0.1 to 5%, all of which are as matrix forming components, one or more of Ni, Cu, and Mn:
0.1 to 7%, Cr and / or Mo: 0.05 to 3%,
A wear-resistant Fe-based sintered alloy current collector pantograph sliding plate material having excellent conductivity, characterized in that the remainder is composed of an Fe-based sintered alloy having a composition of Fe and inevitable impurities. 3. By weight%, as a disperse phase forming component, one or two of silicides of Ti and W: 5 to 30%; also as a disperse phase forming component, hexagonal boron nitride and manganese sulfide. , And one or more of manganese oxide: 0.1 to 5%, all of which are as matrix forming components, one or more of Ni, Cu, and Mn:
0.1 to 7%, C: 0.05 to 0.5%, and the balance being composed of a Fe-based sintered alloy having a composition of Fe and unavoidable impurities. Wear-resistant Fe-based sintered alloy pantograph sliding plate for current collection. 4. By weight%, as a dispersed phase forming component, one or two of Ti and W silicides: 5 to 30%; and also as a dispersed phase forming component, hexagonal boron nitride and manganese sulfide. , And one or more of manganese oxide: 0.1 to 5%, all of which are as matrix forming components, one or more of Ni, Cu, and Mn:
0.1 to 7%, Cr and / or Mo: 0.05 to 3%, C: 0.05 to 0.5%, and a Fe-based firing bond having a composition of the balance Fe and inevitable impurities. A wear-resistant Fe-based sintered alloy pantograph sliding plate material for current collection, which is made of gold and has excellent conductivity.