JP3283546B2 - Oxidation-resistant overlay for Ti Al, Ti3Al intermetallic member and valve made of TiAl, Ti3Al intermetallic compound - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a TiAl oxidation resistance or oxidation resistance and wear resistance are required simultaneously, and Ti ₃ Al intermetallic compound made member for oxidation resistance cladding material, the meat Sheng material The present invention relates to a valve made of TiAl or Ti ₃ Al intermetallic compound which has been overlaid by using.

[0002]

2. Description of the Related Art In recent years, mechanical parts such as transportation equipment such as automobiles and airplanes have been reduced in weight in order to improve the efficiency and the like. In particular, high-speed reciprocating parts such as engines and gas turbines, rotating parts, etc., are required to be reduced in weight as performance and utilization efficiency are improved, and they are often required to have excellent heat resistance at the same time. Is coming.

[0003]

2. Description of the Related Art Conventionally, Ni-based superalloys have been mainly used as materials for such parts requiring heat resistance.
The Ni-base superalloy has a disadvantage that the specific gravity is large and the weight of the member is large. In recent years a specific gravity at about half of the Ni-base superalloy of this type, TiAl specific strength at high temperatures is the Ni-base superalloy or higher, have been developed Ti ₃ Al intermetallic compound, studies are underway commercialization ing.

[0004]

On the other hand, TiAl and Ti ₃ Al
Is superior in oxidation resistance as compared with conventional Ti alloys such as pure Ti and Ti-6Al-4V. At 700 ° C. or more, Ti oxides are remarkably formed, and the use of the same as it is It is difficult. Furthermore TiAl and Ti ₃ Al is not be said to be necessarily excellent in wear resistance, application to partial wear resistance, such as sliding parts, such as the face surface of the engine valve is required is limited.

[0005]

The present invention SUMMARY OF] as a means for solving the conventional problems described above, TiAl, Ti ₃ to the partial oxidation resistance of Al intermetallic compound made member is required (1) Al: 30 And at least one selected from the group consisting of Nb: 0.5 to 20% by weight, Si: 0.5 to 5% by weight, W: 0.1 to 20 % by weight. Element or above element
Further P in addition to: containing 0.001 to 0.02 wt%, the balance is to substantially TiAl consisting Ti, coated Ti ₃ Al intermetallic compound made member for oxidation resistance cladding material .

If it is desired to increase the ductile strength of the coated portion, (2) Al: 30 to 42% by weight, Nb: 0.5 to 20% by weight, Si: 0.5 to 5% by weight, W: One or more elements selected from 0.1 to 20 % by weight or the above elements
P: 0.001 to 0.02% by weight , Cr: 0.1 to 5% by weight, V: 0.1 to 5% by weight, Mn:
0.1-5% by weight, Fe: 0.1-5% by weight, Mo: 0.1
5% by weight, Ta: 0.1 to 5% by weight, Zr: 0.1 to 5% by weight, Hf: 0.1 to 5% by weight, B: 0.005 to 0.0%
Oxidation resistance for members made of TiAl, Ti ₃ Al intermetallic compounds containing one to two or more elements selected from 2% by weight in total and 0.1 to 10% by weight, and the balance substantially consisting of Ti Cover the overlay. Cr, V, Mn, Fe, Mo, Ta, Zr, Hf, B
Is an element for improving the ductile strength of the build-up portion, and makes the ductile strength of the build-up portion favorable.

In order to further improve the oxidation resistance and wear resistance of the coated portion, (3) Al: 30 to 42% by weight, Nb: 0.5 to 20% by weight, Si: 0.5 to 5% by weight, W: one or more elements selected from 0.1 to 20 % by weight or the above elements
In addition, P: 0.001 to 0.02% by weight , and 1 to 50% by weight of one or more compounds selected from carbides, nitrides, and borides, with the balance being substantially TiAl was characterized in that it consists of Ti, the coat the Ti ₃ Al intermetallic compound made member for oxidation resistance cladding material. Carbides, nitrides and borides improve the wear resistance of the coating.

Further, when it is desired to provide the coating member with oxidation resistance, ductile strength and abrasion resistance, (4) Al: 30 to 42% by weight, Nb: 0.5 to 20% by weight, Si: One or more elements selected from 0.5 to 5% by weight, W: 0.1 to 20 % by weight or the above elements
P: 0.001 to 0.02% by weight , Cr: 0.1 to 5% by weight, V: 0.1 to 5% by weight, Mn:
0.1-5% by weight, Fe: 0.1-5% by weight, Mo: 0.1
5% by weight, Ta: 0.1 to 5% by weight, Zr: 0.1 to 5% by weight, Hf: 0.1 to 5% by weight, B: 0.005 to 0.0%
And 0.1 to 10% by weight of one or more elements selected from 2 wt% in total, further carbides, nitrides, boron one selected from the compound or two or more compounds 1 50
Wt.% , With the balance being substantially Ti, TiAl, Ti
₃ covering the Al intermetallic compound made member for oxidation resistance cladding material.

[0009] The (5) the above-mentioned (1) to (4) of the deposition material using Izure or one <br/> of TiAl, Ti ₃ of Al intermetallic compound made of the valve surface or / and the shaft end By covering the part, a valve having excellent heat resistance or heat resistance, ductile strength or heat resistance, ductile strength, and wear resistance can be obtained.

Hereinafter, the composition range of the overlay material of the present invention will be described in detail. Base metal: [Al 30 to 42% by weight] cladding material is preferably the same Ti-Al alloy and the cladding material from familiar faces. Al is an essential element that forms intermetallic compounds TiAl and Ti ₃ Al together with Ti. If Al is less than 30% by weight, the amount of Ti ₃ Al becomes excessively large, resulting in poor ductility and toughness and poor oxidation resistance. Becomes If Al exceeds 42% by weight, Ti Al ₃ becomes excessive and impairs ductility and toughness. For these reasons, it is preferable that Al be 30 to 42% by weight.

[Nb, W: 0.5 to 20% by weight] Nb, W is an extremely effective element for improving oxidation resistance. Nb is also an element that improves strength and ductility. If the content is less than 0.5% by weight, the above effect is small, and if it exceeds 20% by weight, the effect is small and the density of the alloy is increased to offset the effect of weight reduction. Is also expensive.

[Si: 0.5 to 5% by weight] Like Nb, it is an element for improving oxidation resistance. If the content is less than 0.5% by weight, the effect is small and 5% by weight.
If it exceeds 300, the undissolved portion increases and ductility decreases.

[0013] [P: 0.001 to 0.02 wt%] P is an element that improves TiAl, the oxidation resistance of Ti ₃ Al alloys. If the content is less than 0.001% by weight, the effect is small, and if it exceeds 0.02% by weight, the ductility is significantly reduced.

[Cr, V, Mn, Fe, Mo, Ta, Zr, Hf: 0.
These elements are elements that improve the ductility of the coating. If necessary, one or more of these elements may be contained in an amount of 0.1 to 5% by weight, respectively, and a total amount of 0.1 to 10% by weight. Cr, Mn, Fe, Mo are TiA
l, dissolved in Ti ₃ Al both phases, also improves the creep rupture strength with particularly enhancing the strength of the large amount of solid solution in the alloy to TiAl. Cr and Mn also improve ductility. V, Ta, Z
r and Hf form a solid solution in the Ti ₃ Al phase in a large amount, strengthen the alloy by solid solution and improve the ductility of the TiAl and Ti ₃ Al alloy. The above effects of Cr, V, Mn, Fe, Mo, Ta, Zr, and Hf are small at less than 0.1% by weight, and the ductility is conversely reduced at more than 0.5% by weight. The total amount of these elements should be 0.1 to 10% by weight for the same reason.

[B: 0.005 to 0.20% by weight] B has the effect of refining crystal grains and increasing ductility at high temperatures.
It can be contained as needed. When the amount of addition is less than 0.005% by weight, the effect is small,
If it exceeds 20% by weight, a large amount of TiB ₂ precipitates, conversely lowering the strength and ductility.

[Carbides, nitrides, borides: 1 to 50% by weight] Carbides, nitrides, and borides are elements that increase the hardness of the coating and significantly improve the wear resistance. And the effect is small when it is less than 1% by weight, and when it exceeds 50% by weight, the toughness and ductility of the coating portion are reduced.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The present invention Ti Al, for at least a portion oxidation resistance is required of the member made of Ti ₃ Al intermetallic alloy, a cladding material that satisfies the performance to heat member by overlaying Ti Al, Ti ₃
The advantage of lightness, which is a characteristic of Al intermetallic compounds, can be maximized. The oxidation-resistant overlay of the present invention is also based on Ti Al, Ti ₃ Al intermetallic compounds.
i Al, does not impair the characteristics referred to as lightweight having a Ti ₃ Al intermetallic compound. Further, when it is desired to increase the ductile strength in addition to the oxidation resistance of the overlay portion, each of Cr, V, Mn, Fe, Mo, Ta, Zr and Hf is 0.1 to 5% by weight, and B is 0.005 to 0.5%. 20% by weight
One or more elements selected from the group consisting of
Its purpose By incorporating the resistance cladding material is achieved. Further, one or two selected from 1 to 50% by weight of carbide, nitride and boride are added to the oxidation-resistant overlay of the present invention.
By including more than one kind of compound, it is possible to obtain a built-up portion also having abrasion resistance. As described above, the acid resistance of the Ti Al, Ti ₃ Al intermetallic compound of the present invention
The padding was member a predetermined location by resistant cladding material, it is suitable for engine valves, because said meat further and if desired, ductility strength and heat resistance in Sheng moiety, but also combines the abrasion resistance.

[0018]

The ingot of Example] Example 1 (a) TiAl and / or Ti ₃ Al intermetallic compound having a composition shown in preparation Table 1 of the cladding material, the plasma arc as a heat source in an argon gas atmosphere, It is smelted using a skull furnace equipped with a water-cooled copper crucible, and is 20 mm wide, 60 mm long and 10 mm thick from the ingot.
Cut out a chip of mm and use it as a base.

(B) Manufacture of hardfacing material Powder except for the hard component is prepared by centrifugal spraying, and then sieved to collect only powder having a size of 60 to 140 mesh. The hard component powder is kneaded with the powder.

(C) Overlaying method Overlaying is performed by plasma powder welding (PPW). The conditions of PPW vary depending on the type of the overlay material and the base, but the current is about 80 to 120 A and the speed is about 80 to 250 mm.
/ Min, plasma gas amount 1.0 l / min, overlay material powder amount 1.
0 l / min and the shielding gas amount is 10 l / min.

Under the above conditions, the overlaid portion including the overlaid portion 2
Table 1 shows the results of a high-temperature oxidation test of a cut-out specimen of 0 × 10 × 10 mm and a measurement of the hardness of the section of the built-up portion.

[Table 1] * Oxidation test: Heat the sample at 900 ° C for 96 hours. A: Almost no oxide scale is formed. B: Slightly oxidized, but actually usable without peeling of oxide scale C: Oxidation progressed and peeling of oxide scale was observed, and actually unusable D: Large amount of scale such as TiO ₂ was formed and peeled, and completely Usage prohibited

In Table 1, 1A to 6A are comparative examples, sample No. 1A is a sample without overlaying, and No. 2A is Al.
No. 3 using an overlay material containing 30% by weight or less of
A is a sample using a hardfacing material containing no Si and / or Nb, No. 4A is a sample using a hardfacing material containing 42% by weight or more of Al, and No. 5A is a sample using 50% by weight or more of a hard component. Sample No. 6A using a build-up material was a sample using a build-up material to which a hard component was added but did not contain Si and / or Nb.

According to Table 1, the samples No. 1 to No. 1 of the present invention were used.
Numeral 30 indicates oxidation resistance which can be actually used, and there is no crack in the overlaid portion. On the other hand, No. 1A, which is not overlaid, is inferior in oxidation resistance, No. 2A, which lacks Al, has reduced ductility and cracks, and No. 3A, which does not contain Si and / or Nb, is inferior in oxidation resistance. No. 4A, which contains too much Al, also has reduced ductility and cracks, and No. 5A, which has too much hard components, also has reduced toughness and cracks. Even when a hard component is added, Si and / or No. 6A containing no Nb is inferior in oxidation resistance.

Example 2 A valve having a composition of Ti-33.5Al-0.5Si-1.0Nb-0.5Cr and having a face diameter of 30 mm, a stem diameter of 8 mm and a length of 102 mm was manufactured by precision casting and finishing. Ti-33.5Al powder, Nb (99.9% by weight) powder and TiC powder prepared by centrifugal spraying were blended to become Ti-33.5Al-10Nb-15TiC, and an organic solvent was added and kneaded. And then sifted and dried to obtain a build-up material powder.

The above valve face was processed with R3, and was built up under the following conditions. Method: PPW Current: 90-100 A Speed: 300-400 mm / min Plasma gas amount: 1.0 l / min Overlay material powder supply gas amount: 1.0 l / min Shield gas amount: 10 l / min

As Comparative Example A, a similar valve was filled with Stellite # 6, and as Comparative Example B, Ni-15 was added to a similar valve.
Cr-4Si-3.5B-4Fe was overlaid.

Table 2 shows the results of overlaying the product of the present invention and Comparative Examples A and B.

[Table 2]

From Table 2, it can be seen that the product of the present invention did not crack, but the comparative examples both did.

[0029]

According to the present invention, oxidation resistance is imparted to necessary parts,
TiAl imparted with abrasion resistance, Ti ₃ Al intermetallic compound made member obtained. Thus the scope of the TiAl, Ti ₃ Al intermetallic compound is wider.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Shinichi Umino 2958 Ishikawa, Fujisawa-shi, Kanagawa Fuji Valve Co., Ltd. Fujisawa Plant (56) References JP-A-1-111858 (JP, A) JP-A-62 -56561 (JP, A) JP-A-2-70072 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 35/30 C22C 14/00 C23C 4/06

Claims (5)

(57) [Claims] (1) Al: 30 to 42% by weight, Nb: 0.5 to 2%
0 wt%, Si: 0.5 to 5 wt%, W: 0.1 to 20 fold <br/> weight% to selected one or more elements or above
Further P in addition to the serial element: 0.001-0.02 contained by weight%, the balance being substantially TiAl which is characterized by comprising a Ti, Ti ₃ Al intermetallic compound made member for oxidation resistance buildup Lumber 2. Al: 30 to 42% by weight and Nb: 0.5 to 2%.
0% by weight, Si: 0.5 to 5% by weight, W: 0.1 to 20 weights
amount%One or more elements selected fromOr above
P: 0.001 to 0.02% by weight in addition to the above elements
And further Cr: 0.1 to 5% by weight, V: 0.1 to 5% by weight
%, Mn: 0.1 to 5% by weight, Fe: 0.1 to 5% by weight, M
o: 0.1 to 5% by weight, Ta: 0.1 to 5% by weight, Zr: 0.
1 to 5% by weight, Hf: 0.1 to 5% by weight, B: 0.005
One or more elements selected from ~ 0.02% by weight
0.1 to 10% by weight in total, and the balance is substantially
TiAl, Ti characterized by being composed of Ti_ThreeAl between metal
For compound partsOxidation resistanceOverlay material 3. Al: 30 to 42% by weight and Nb: 0.5 to 2%.
0% by weight, Si: 0.5 to 5% by weight, W: 0.1 to 20 weights
amount%One or more elements selected fromOr above
P: 0.001 to 0.02% by weight in addition to the above elements
And one selected from carbides, nitrides, and borides.
Or two or more compounds1-50% by weightContaining, the rest
TiAl, Ti characterized by being substantially composed of Ti_ThreeAl
 For intermetallic compoundsOxidation resistanceOverlay material 4. Al: 30 to 42% by weight and Nb: 0.5 to 2%.
0% by weight, Si: 0.5 to 5% by weight, W: 0.1 to 20 weights
amount%One or more elements selected fromOr above
P: 0.001 to 0.02% by weight in addition to the above elements
And further Cr: 0.1 to 5% by weight, V: 0.1 to 5% by weight
%, Mn: 0.1 to 5% by weight, Fe: 0.1 to 5% by weight, M
o: 0.1 to 5% by weight, Ta: 0.1 to 5% by weight, Zr: 0.
1 to 5% by weight, Hf: 0.1 to 5% by weight, B: 0.005
One or more elements selected from ~ 0.02% by weight
0.1 to 10% by weight of carbon in total, and carbide and nitride
, Or one or more compounds selected from borides
To1-50% by weightContained, with the balance substantially consisting of Ti
TiAl, Ti characterized by the following:_ThreeAl Intermetallic compound parts
forOxidation resistanceOverlay material 5. Among the cladding material of claims 1 to 4
Using one any of characterized in that at least the valve face and buildup TiAl, Ti ₃ Al intermetallic compound made of valve