JPH05202402A - High strength and corrosion and wear resistant member and production tereof - Google Patents

Abstract

PURPOSE:To produce the above high strength and corrosion and wear resistant member by forming a ductile member on the inside of a high strength and corrosion resistant substrate of a Co-based alloy, etc., and partially forming a lining layer of a wear resistant composite material on the outside. CONSTITUTION:A ductile member 20 of stainless steel in formed on the inside of a high strength and corrosion resistant substrate 10 consisting of at least one of Co-, Ni-and Fe-based alloys. Parts 10a of the outside requiring wear resistance are coated with a slurry 30a consisting of WC having about 10mum average particle diameter, acrylic resin and methyl ethyl ketone and the slurry 30a is worked into a WC formed body 30 having a specified thickness. Particles 40 of an Ni-based alloy acting as a matrix metal are kneaded with acrylic resin and applied on neighborhood and the surface of the WC formed body 30. Sintering in a vacuum furnace 50 and finishing are then carried out to form a lining layer 60 of a wear resistant composite material. The physical properties of the lining layer 60 are freely regulated and a high strength and corrosion and wear resistant member is thus obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a mechanical member or the like with a corrosion-resistant wear-resistant material, and more particularly to a high-strength corrosion-resistant wear-resistant member in which a base material made of a corrosion-resistant material is provided with wear resistance. It relates to a manufacturing method.

[0002]

2. Description of the Related Art As a conventional technique for coating a mechanical member with a corrosion-resistant and wear-resistant material, hard particles are fixed on the entire surface of a substrate by using an organic binder or the like, and the fixed hard particles are arranged so that a matrix metal is brought into contact with them. Then, a method is known in which a lining layer made of a wear-resistant composite material is formed by coating by heating and melting and infiltrating a matrix metal into the hard particles.

For example, Japanese Patent Laid-Open No. 63-
No. 50402 is a carbide or boride powder that is kneaded with an organic binder to coat a substrate, and the obtained coating layer is machined and then placed in a sintering furnace, where the organic binder in the coating layer is heated. Disclosed is a method for coating an abrasion-resistant material, in which the molten metal binder (matrix metal) is permeated into the coating layer and bonded to the base material. Further, Japanese Patent Application Laid-Open No. 60-8950 filed by the present applicant
No. 3, JP-A-60-89504 discloses a similar method. In these methods, the molten matrix metal penetrates into the hard particles to form a lining layer of composite material and diffusion bond with the substrate material. However, the above-mentioned conventional structure and its method have the following problems.

(1) When the above conventional structure is applied to, for example, a screw for a plastic molding machine, the base material directly receives the torque from the drive shaft, and there is a problem that the corner portion of the key groove is easily broken.

(2) Since the lining layer made of the composite material is formed on the entire surface of the base material by sintering, cracks occur when the linear expansion coefficient of the base material and the lining layer made of the composite material are separated from each other. It is necessary that the linear expansion coefficients of both are similar.
However, the linear expansion coefficient of the lining layer made of composite material is 7 ×
It is necessary to use a base material having a small linear expansion coefficient corresponding to 10 ⁻⁶ to 8 × 10 ^−6, and the material of the base material is limited.

(3) The lining layer made of the composite material is limited to a specific composition due to the difference in the coefficient of linear expansion, it is difficult to improve the mechanical properties of the lining layer made of the composite material, and the material of the base material is also limited. Therefore, it is difficult to improve the strength of the member in which the base material is covered with the lining layer made of the composite material.

(4) Since the lining layer made of the composite material is coated on the entire surface of the base material, the lining layer at the portion where wear resistance is unnecessary (for example, screw valley) is applied to the product as an extra cost.

[0008]

As described above, since the base material has a structure which directly receives the torque as described above, that portion is easily broken.

Further, in the conventional method, since the entire surface is covered with the lining layer made of the composite material, the contact area is large, the material of the base material is limited due to the difference in the coefficient of linear expansion, and the physical properties of the lining layer made of the composite material are hard. Since it depends on the type of particles and the type of matrix metal, there is a limit to the strength of the lining layer itself made of the composite material and the strength of the combination of the lining layer made of the composite material and the substrate. The member of the present invention is to provide a high-strength corrosion-resistant and abrasion-resistant member capable of preventing breakage of a portion receiving torque.

Further, in the method of the present invention, the lining layer made of a composite material is partially coated on a portion requiring abrasion resistance to widen the range of selection of the base material, and the lining layer made of a composite material is adjusted for physical properties. High strength that can freely adjust the physical properties of the lining layer made of composite material by adding particles, diversify the combination of lining layer made of composite material and base material, and improve the strength of the combined member It is an object of the present invention to provide a method for manufacturing a corrosion resistant and wear resistant member.

[0011]

The member of the present invention comprises a high-strength corrosion-resistant base material comprising at least one alloy selected from the group consisting of Co-based alloys, Ni-based alloys and Fe-based alloys, and A high-strength corrosion-resistant wear-resistant member comprising a ductile member provided inside and a lining layer made of a wear-resistant composite material partially provided outside the high-strength corrosion-resistant base material.

Further, the method of the present invention comprises at least one selected from the group consisting of Co-based alloys, Ni-based alloys, and Fe-based alloys.
In a method of manufacturing a high-strength corrosion-resistant wear-resistant member, wherein a lining layer made of a wear-resistant composite material is partially provided on the outside of a high-strength corrosion-resistant base material having a ductile member on the inside of a kind of alloy,
Carbides, borides, and
Hard particles selected from the group of nitrides and mixtures thereof, optionally added metal particles for adjusting physical properties, and matrix metal selected from the group of Fe-based alloys, Ni-based alloys, Co-based alloys and mixtures thereof A method for producing a high-strength corrosion-resistant and wear-resistant member, which comprises forming a lining layer made of a wear-resistant composite material containing and.

Furthermore, the present invention provides a layer of the mixture after providing a layer comprising a mixture of the hard particles and the optionally added metal particles for adjusting physical properties only in a portion of the base material which requires abrasion resistance. Is a method for producing a high-strength corrosion-resistant and wear-resistant member, which comprises heating and permeating the matrix metal to form a lining layer.

[0014]

The member of the present invention is applied to a mechanical member such as a kneading disk or a screw element which requires high strength corrosion resistance and abrasion resistance. For example, when applied to a screw element for a plastic molding machine, the base material is abraded due to resin kneading and transfer, and a large bending stress is applied.
Therefore, the preferred material for this substrate has a bending strength of 130 k.
gf / mm ² , An alloy having a hardness H _R C of 40 or more and having corrosion resistance. As this material, for example, Cr 25.0 to 30.
0% by weight, W 4.0 to 14.0% by weight, C 0.6 to 2.
8 wt%, Fe 3.0 wt% or less, Ni: 0.6-2.
A Co-based alloy composed of 0% by weight, Si: 0.8 to 1.5% by weight, the balance Co and inevitable impurities can be mentioned. The limitation of each component of this Co-based alloy is that C in this component range.
The o-based alloy has corrosion resistance exceeding that of the lining layer (corrosion resistance of about 1.5 times that of the lining layer) and maintains hardness H _R C50, and therefore has excellent wear resistance and rigidity. As a result, This is because deformation is suppressed, crush strength is increased, and chipping resistance is increased.

Since the ductile member receives torque from the drive shaft at this point, the preferred ductile member is 1.0 kgf m / cm.
² It is a steel material such as stainless steel or structural steel having the above Charpy impact value. In the case of these steels, key groove processing becomes easy.

The lining layer is severely worn due to metal contact with the barrel and abrasion with the resin, and therefore requires high wear resistance and corrosion resistance. A preferable lining layer composition is a Ni-based cermet containing 20 to 70% by weight of tungsten carbide particles. The Ni-based cermet has a metal component of cermet of nickel or a nickel alloy, and examples of the nickel alloy include BNi-1, BNi-2, and BNi-3.

The reason why the content range of the tungsten carbide particles in this composition is set to 20 to 70% by weight is that when the content exceeds 70%, the lining layer becomes brittle and the production is difficult,
Also, if it is less than 20%, the wear resistance is lowered. Since the high-strength corrosion-resistant and wear-resistant member of this structure is provided with the ductile member at the portion receiving the torque from the drive shaft, it is possible to prevent breakage from the corner of the key groove.

In the method of the present invention, it is necessary to consider the difference in the linear expansion coefficient between the lining layer and the base material, by coating the lining layer made of the composite material only on the portion where abrasion resistance is required. Eliminates the possibility of widening the selection of base materials. Further, by adding particles for adjusting physical properties to the lining layer, the physical properties of the lining layer are arbitrarily adjusted, the combination of the lining layer made of the composite material and the base material is diversified, and the strength of the combined member is improved.

[0019]

EXAMPLES Examples of the present invention will be described below. The high-strength corrosion-resistant and abrasion-resistant members targeted in these examples are the kneading disc 100 shown in FIG. 1 and the screw 200 shown in FIG. 2, and the lining layer 30 is provided at the portion requiring abrasion resistance in FIG. It is provided. In FIG. 1, 10 is a base material, 2
0 is a ductile member. In FIG. 2, 11 is a base material and 21 is a ductile member. 31 is a lining layer. Example 1 (manufacture of a kneading disk by a spray method)

Acrylic resin as the organic binder, methyl ethyl ketone as the organic solvent, and W as the hard particles.
C, Ni-based alloy particles as matrix metal, Stellite # 12 as base material (component: C: 1.5% by weight, Si:
1.3 wt%, Ni: 0.8 wt%, Cr: 28.3 wt%, W: 8.2 wt%, Fe: 0.4 wt%, Co:
Remainder, flexural strength: 320 kgf / mm ² , Hardness H _R 50) was used. A slurry was prepared with 100 parts by weight of WC having an average particle size of 10 μm, 1 part by weight of acrylic resin and 14 parts by weight of methyl ethyl ketone as a mixing ratio.

The kneading disc substrate 10 has a stainless steel (Charpy impact value: 20 kgf m / cm 2) inner surface.
² Of the outer surface of the base material 10, which is required to have wear resistance, that is, a portion 10a where a lining layer is formed is preliminarily processed into a dimension on the negative side of the finished dimension. (See A of FIG. 3). Next, the kneaded slurry 30a was coated on the above-mentioned location 10a of the kneading disk substrate 10 by using a spray device for coating (not shown) (see B in FIG. 3). The covered WC molded body 30 was processed by a milling machine to have a predetermined thickness (for example, 5 mm or less) (see C in FIG. 3). Ni-based alloy particles 40, which are matrix metals, are present in the vicinity of and on the surface of the WC molded body 30 partially present on the outer surface of the base material 10 as they are, in a state of being kneaded with an acrylic resin, or in the form of a sheet and brought into contact with each other. This was placed in a vacuum furnace 50 (see D in FIG. 3). Then, this is sintered under the sintering conditions shown in Table 1 and subjected to finish processing, and the lining layer 60 (WC6 made of wear-resistant composite material).
0% + Ni 40%) (see E in FIG. 3).

The lining layer 60 made of a composite material of WC and Ni-based alloy has a linear expansion coefficient of 7 × 10 ^-6 / ° C. to 8 × 10 ^-6.
/ ° C., on the other hand, Stellite # 12 of the substrate 10 is 14 × 10
^-6 / ° C. It is difficult to apply the lining layer made of the composite material to the entire surface by the conventional method, but it is possible to make the difference in the linear expansion coefficient partially by the above-mentioned embodiment. Furthermore, by backing up with Stellite # 12 having a hardness of H _R C50, the crushing strength of the lining layer made of the composite material combined with the base material was further enhanced. The results are shown in Table 2, Sample No. 4 shows.

A lining layer (WC39% + SUS41021% + Ni40) was used in the same manner as in Example 1 except that a mixed powder of WC39 parts by weight and SUS41021 parts by weight as a metal powder for adjusting physical properties was used instead of WC.
%) To form a kneading disc having high strength and corrosion resistance. The experimental results of the crush strength are shown in No. 2 of Table 2. 5 shows. Example 2 (manufacturing of screw element by spraying method)

Acrylic resin as the organic binder, methyl ethyl ketone as the organic solvent, and W as the hard particles.
C, Ni-based alloy particles were used as the matrix metal, and Stellite # 12 having a ductile member inside was used as the base material. A slurry was prepared with 100 parts by weight of WC having an average particle size of 10 μm, 1 part by weight of acrylic resin and 14 parts by weight of methyl ethyl ketone as a mixing ratio.

The inner surface of the screw element base material 11 is coated with a ductile member 21 made of stainless steel (the same material as in Example 1), and the outer surface of the base material 11 is preliminarily covered with a portion 11a where a lining layer is formed. It was processed to a dimension on the negative side of the final finish dimension. Next, the previously kneaded slurry 31a was coated on a predetermined portion 11a of the screw element base material 11 by using a coating spray device (not shown) (see A in FIG. 4). This coated WC molded body 3
1 was processed by a milling machine to have a predetermined thickness (for example, 5 mm or less) (see B in FIG. 4). In the vicinity and on the surface of this partially existing WC compact 31, Ni-based alloy particles 41 serving as a matrix metal are kneaded in the state of being kneaded with an acrylic resin or in the form of a sheet and placed in contact with each other in a vacuum furnace 51. (See C in FIG. 4). This was sintered under the sintering conditions shown in Table 1 and subjected to finishing to form a lining layer 61 made of a wear resistant composite material (see D in FIG. 4).

Composite material of WC and Ni-based alloy (WC60% +
Ni 40%) has a linear expansion coefficient of 7 ×.
10 ⁻⁶ / ° C. to 8 × 10 ⁻⁶ / ° C., Stellite # 12 is 14
It is × 10 ^-6 / ° C. It is difficult to apply the lining layer made of the composite material on the entire surface by the conventional method, but it is possible to apply it partially in this example, and the hardness H _R C50
By backing up with sterato, the strength of the lining layer 61 made of the composite material combined with the base material was further strengthened. Example 3 (Manufacture of a kneading disk by the CIP method)

A ductile member 20 made of stainless steel on the inner surface.
A substrate 10 (same material as that of Example 1) coated with was prepared (see A in FIG. 5). 100 parts by weight of WC having an average particle size of 10 μm as hard particles of a lining layer made of a composite material, 3 parts by weight of an acrylic resin as an organic binder, and 7 parts by weight of methyl ethyl ketone as an organic solvent are mixed, kneaded and dried to obtain 35 to 120 mesh ( 0.5-0.125mm)
It was crushed and classified into The granulated powder 30b was filled into the outer surface of the base material, the peripheral surface was surrounded by the rubber cylinder 71, and the upper and lower surfaces were surrounded by the iron lid 72, which was put in the hydrostatic device 70 and the stellite # 12 was used.
1500 kgf / cm ² on the cylindrical substrate surface of The layer 30 'was overmolded by cold isostatic pressing (CIP) (see B to D in FIG. 5). This is processed to a predetermined thickness (5 mm or less) to form a lining layer 30 (see E in FIG. 5), and N
The i-based alloy particles 40 are placed in contact with each other, and the vacuum furnace 50
(See F in FIG. 5) and sintered under the conditions shown in Table 1. This causes the acrylic resin to decompose and evaporate at 400 ° C, leaving 1
A Ni-based alloy melted at 100 ° C. was infiltrated to form a lining layer 60 made of a composite material, diffusion-bonded to the base material 10, and processed into a kneading disk shape. As a result, a high-strength corrosion-resistant and abrasion-resistant kneading disk can be manufactured at low cost.

A lining layer (WC39% + SUS41021%) was prepared in the same manner as in Example 3 except that a mixed powder of WC39 parts by weight and SUS410, which was a metal powder for adjusting physical properties, and 21 parts by weight was used instead of WC. + Ni
40%) to form a kneading disk having high strength, corrosion resistance and abrasion resistance. Example 4 (Manufacturing of screw element by CIP method)

A ductile member 21 made of stainless steel on the inner surface.
A base material 11 (same material as in Example 1) coated with was prepared (see A in FIG. 6). 100 parts by weight of WC having an average particle size of 10 μm as hard particles of a lining layer made of a composite material, 3 parts by weight of an acrylic resin as an organic binder, and 7 parts by weight of methyl ethyl ketone as an organic solvent are mixed, kneaded and dried to obtain 35 to 120 mesh ( 0.5-0.125mm)
It was crushed and classified into This granulated powder was applied to the surface of the cylindrical base material of Stellite # 12 using a hydrostatic pressure device 70 at 1500 kgf / cm.
² It was molded by cold isostatic pressing (CIP) (see B to D in FIG. 6). This is a predetermined thickness (5 mm or less)
(See E in FIG. 6), the Ni-based alloy particles are placed in contact with each other, and inserted into the vacuum furnace 80 (see F in FIG. 6).
Sintering was performed under the conditions shown in Table 1. This makes acrylic resin 40
The Ni-based alloy, which decomposes and evaporates at 0 ° C. and melts at 1100 ° C. penetrates into the space, forms the lining layer 61 made of a composite material, diffuse-bonds it to the base material 11, and finishes it into a screw element shape to achieve high strength. Corrosion and abrasion resistant screw elements can now be manufactured at low cost. Comparative Example 1 (manufacture of a kneading disk by a conventional spray method)

A kneading disk was manufactured in the same manner as in Example 1 except that the substrate 10 was SUS420J2 and the lining layer was formed on the entire outer surface thereof. The experimental results of the crush strength are shown in No. 2 of Table 2. Shown in 1. Comparative Example 2 (manufacture of a kneading disk by a conventional spray method)

The base material 10 is SUS420J2, and a lining layer is formed on the entire outer surface, and the lining layer is WC: 39%, SUS410: 21%, Ni: 40.
A kneading disk was manufactured in the same manner as in Example 1 except that the percentage was changed to%. The experimental results of the crush strength are shown in Table 2.
No. 2 shows. Comparative Example 3 (manufacture of a kneading disk by a conventional spray method)

A kneading disk was manufactured in the same manner as in Example 1 except that the base material 10 was cold tool steel and a lining layer was formed on the entire outer surface thereof. The results are shown in Table 2.
No. 3 shows.

As is clear from the above examples and comparative examples, according to the present invention, a high-strength corrosion-resistant and wear-resistant material is diffusion-bonded by sintering to a part of the screw element made of a high-hardness food material, and a corrosion resistance of a three-layer structure is obtained. It was confirmed that the wear resistant member can be manufactured with high strength and at low cost. It was also confirmed that the range of material combinations could be expanded.

[0034]

According to the high-strength corrosion-resistant and abrasion-resistant member of the present invention, since the ductile member is provided at a portion that receives torque from the drive shaft, it is possible to prevent breakage from the corner of the key groove. it can.

Further, in the method of the present invention, by partially joining the lining layers made of the composite material, the restriction of the base material on the linear expansion coefficient is removed, and the material having a different linear expansion coefficient between the base material and the lining layer. Can be used. Therefore, by using a high-strength material and a composite material thereof to back up the lining layer made of the composite material, and combining the base material and the lining layer made of the composite material, the strength, particularly the crush strength is improved, and the cost is reduced. ..

Further, by adding particles for adjusting physical properties to the lining layer made of the composite material, the coefficient of linear expansion can be adjusted and increased, and the hard particles can be decreased. As a result, a substrate having a large coefficient of linear expansion can be obtained. Can also be used to further improve the mechanical properties of the lining layer made of a composite material.

When using a high-strength base material, a composite material in which a ductile member having low hardness is combined on the inner diameter side is used in order to facilitate inner diameter processing and key groove processing, thereby reducing cost and breaking from key groove. Can also be prevented. The present invention can be applied not only to the kneading disc and the screw element, but also to other mechanical members that require high strength, corrosion resistance and abrasion resistance.

[0038]

[Table 1]

[0039]

[Table 2]

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a kneading disc to which a high-strength corrosion-resistant and abrasion-resistant member according to the present invention is applied.

FIG. 2 is an explanatory diagram of a screw element to which the high-strength corrosion-resistant and abrasion-resistant member according to the present invention is applied.

FIG. 3 is a diagram illustrating a method according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a method according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating a method according to a third embodiment of the present invention.

FIG. 6 is a diagram illustrating a method according to a fourth embodiment of the present invention.

[Explanation of reference numerals] 10, 11 ... Base material, 20, 21 ... Ductile member, 30, 31
... Lining layer, 40, 41 ... Ni-based alloy particles, 50 ...
Vacuum furnace, 60, 61 ... Lining layer

Claims (8)

[Claims] 1. A high-strength corrosion-resistant base material comprising at least one alloy selected from the group consisting of Co-based alloys, Ni-based alloys, and Fe-based alloys, and a ductile member provided inside the base material. A high-strength corrosion-resistant wear-resistant member, comprising: a lining layer made of a wear-resistant composite material, which is partially provided outside the high-strength corrosion-resistant base material. 2. The high-strength corrosion resistant substrate has a composition of C
r: 25.0 to 30.0% by weight, W: 4.0 to 14.0
Wt%, C: 0.6 to 2.8 wt%, Fe: 3.0 wt% or less, Ni: 0.6 to 2.0 wt%, Si: 0.8 to
The high-strength corrosion-resistant wear-resistant member according to claim 1, which comprises 1.5% by weight, the balance being Co and inevitable impurities. 3. The ductile member is 1.0 kgf m / cm ² The high-strength corrosion-resistant and abrasion-resistant member according to claim 1, which is a steel material having the above-mentioned impact value. 4. The high-strength corrosion-resistant wear-resistant member according to claim 1, wherein the lining layer is a Ni-based cermet containing 20 to 70% by weight of tungsten carbide particles. 5. A high-strength corrosion-resistant base material having a ductile member inside at least one alloy selected from the group consisting of Co-based alloys, Ni-based alloys, and Fe-based alloys, and is partially wear-resistant on the outside. In a method for producing a high-strength corrosion-resistant and wear-resistant member provided with a lining layer made of a composite material, a carbide, boride,
A wear resistant composite comprising hard particles selected from the group of nitrides and mixtures thereof and matrix metals selected from the group of Fe-based alloys, Ni-based alloys, Co-based alloys and mixtures thereof. A method for manufacturing a high-strength corrosion-resistant wear-resistant member for forming a lining layer. 6. The lining layer is formed by providing a layer made of the hard particles only on a portion of the base material that requires abrasion resistance, and then heat infiltrating the matrix metal into the layer. A method for manufacturing a high-strength corrosion-resistant and wear-resistant member. 7. A high-strength corrosion-resistant base material having a ductile member inside at least one alloy selected from the group consisting of Co-based alloys, Ni-based alloys, and Fe-based alloys. In a method for producing a high-strength corrosion-resistant and wear-resistant member provided with a lining layer made of a composite material, only a portion of the base material that requires wear resistance is selected from the group of carbides, borides, nitrides and mixtures thereof. Wear-resistant composite material containing one or more kinds of hard particles, metal particles for adjusting physical properties, and a matrix metal selected from the group of Fe-based alloys, Ni-based alloys, Co-based alloys and mixtures thereof. For producing a high-strength corrosion-resistant and wear-resistant member for forming a lining layer of the same. 8. A layer made of a mixture of the hard particles and the metal particles for adjusting physical properties is provided only on a portion of the base material that requires abrasion resistance, and then the matrix metal is added to the layer of the mixture. The method for producing a high-strength corrosion-resistant wear-resistant member according to claim 7, wherein the lining layer is formed by heating and permeating.