JP2005320557A - Abrasion resistant member and manufacturing method therefor - Google Patents

Abrasion resistant member and manufacturing method therefor Download PDF

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JP2005320557A
JP2005320557A JP2004137486A JP2004137486A JP2005320557A JP 2005320557 A JP2005320557 A JP 2005320557A JP 2004137486 A JP2004137486 A JP 2004137486A JP 2004137486 A JP2004137486 A JP 2004137486A JP 2005320557 A JP2005320557 A JP 2005320557A
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cemented carbide
mass
base material
hardened layer
resistant member
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Tadashi Noda
正 野田
Takeshi Hasegawa
健 長谷川
Eiji Sakai
英治 酒井
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Daido Steel Co Ltd
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Daido Steel Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an abrasion resistant member having high abrasion resistance, and to provide a manufacturing method therefor. <P>SOLUTION: The abrasion resistant member consists of a base metal and a hardened layer harder than the base metal formed thereon, wherein the hardened layer comprises 60 to 20 mass% of matrix made of an Fe-Cr-C-based alloy, and 40 to 80 mass% of hard metal particles with an average particle diameter D50 of 60 to 800 μm, dispersed in the matrix of the alloy. Thus obtained abrasion-resistant member disperses a sufficient amount of the hard metal particles having such a size as to sufficiently develop the abrasion resistance in the hardened layer, and consequently provides high abrasion resistance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、各種の産業機械の摩耗箇所に用いられる耐摩耗性部材およびその製造方法に関するものである。   The present invention relates to a wear-resistant member used for wear points of various industrial machines and a method for manufacturing the same.

鉄鋼やセメントを搬送するコンベアのレール、シュートライナなど、耐摩耗性が要求される部材には、母材上に硬化層を肉盛りした耐摩耗性部材が使用される。   For members that require wear resistance such as rails and shoe liners for conveyors that convey steel and cement, wear-resistant members with a hardened layer built up on a base material are used.

上記硬化層には、クロム炭化物を析出させたものが知られている。また、さらに耐摩耗性を高めるために、炭化タングステン粉末を硬化層に分散させることが考えられている（特許文献１）。
特開平１１−１７２４０８号公報 The hardened layer is known to have chromium carbide precipitated. In order to further improve the wear resistance, it is considered to disperse the tungsten carbide powder in a hardened layer (Patent Document 1).
Japanese Patent Laid-Open No. 11-172408

しかし、炭化タングステンの粉末は、平均粒径Ｄ５０が１μ以下と、非常に微細な粉末であるので、炭化タングステンのビッカース硬さ（Ｈｖ）が１５００であるにも拘わらず、炭化タングステン粉末を分散させた硬化層の硬度は１０００Ｈｖ程度と、十分な硬度が得られず、その結果、耐摩耗性も不十分であった。なお、平均粒径Ｄ５０とは、全粒子質量に対する累積質量が５０％となる粒子径をいう。   However, since the tungsten carbide powder is a very fine powder having an average particle diameter D50 of 1 μm or less, the tungsten carbide powder is dispersed even though the Vickers hardness (Hv) of tungsten carbide is 1500. Further, the hardness of the hardened layer was about 1000 Hv, and sufficient hardness was not obtained. As a result, the wear resistance was insufficient. The average particle diameter D50 refers to a particle diameter at which the cumulative mass with respect to the total particle mass is 50%.

本発明は、以上の事情を背景として為されたものであり、その目的とするところは、高い耐摩耗性を有する耐摩耗性部材およびその製造方法を提供することにある。   The present invention has been made against the background described above, and an object of the present invention is to provide a wear-resistant member having high wear resistance and a method for producing the same.

かかる目的を達成するための第１発明は、母材上に、その母材よりも硬い硬化層が形成されている耐摩耗性部材であって、その硬化層は、マトリックス合金が６０質量％〜２０質量％であり、そのマトリックス合金に平均粒径Ｄ５０が６０μｍ〜８００μｍの超硬合金粒子が４０質量％〜８０質量％分散されていることを特徴とする。   A first invention for achieving such an object is a wear-resistant member in which a hardened layer harder than the base material is formed on a base material, and the hardened layer has a matrix alloy of 60% by mass to 20 mass%, and cemented carbide particles having an average particle diameter D50 of 60 μm to 800 μm are dispersed in the matrix alloy in an amount of 40 mass% to 80 mass%.

第２発明は、母材上に、その母材よりも硬い硬化層が形成されている耐摩耗性部材の製造方法であって、(a)粒径が２．０ｍｍよりも大きい超硬合金塊を粉砕して平均粒径Ｄ５０が６０μｍ〜８００μｍの超硬合金粒子を得る粉砕工程と、(b)その粉砕工程で得た超硬合金粒子とマトリックス合金粉末とを混合して、平均粒径Ｄ５０が６０μｍ〜８００μｍの超硬合金粒子を４０質量％〜８０質量％含む肉盛粉末を得る混合工程と、(c)その混合工程で得た肉盛粉末を母材上に肉盛溶接することにより、前記硬化層を形成する肉盛工程とを含むことを特徴とする。   The second invention is a method of manufacturing a wear-resistant member in which a hardened layer harder than the base material is formed on the base material, and (a) a cemented carbide ingot having a particle size larger than 2.0 mm Pulverizing the mixture to obtain cemented carbide particles having an average particle size D50 of 60 μm to 800 μm, and (b) mixing the cemented carbide particles obtained in the pulverization step with the matrix alloy powder to obtain an average particle size D50 A mixing step of obtaining a built-up powder containing 40 to 80% by weight of cemented carbide particles having a particle size of 60 μm to 800 μm, and (c) overlay welding the build-up powder obtained in the mixing step on the base material And a build-up process for forming the hardened layer.

第３発明は、第２発明において、前記超硬合金塊として使用済みの超硬工具を用いることを特徴とする。   A third invention is characterized in that, in the second invention, a used cemented carbide tool is used as the cemented carbide ingot.

上記第１発明よれば、硬化層中に、耐摩耗性を十分に発揮することができる大きさを有する超硬合金粒子が、十分量分散されているので、高い耐摩耗性が得られる。   According to the first invention, since a sufficient amount of cemented carbide particles having a size that can sufficiently exhibit wear resistance is dispersed in the hardened layer, high wear resistance can be obtained.

第２発明の製造方法により製造される耐摩耗性部材は、耐摩耗性を十分に発揮することができる大きさを有する超硬合金粒子が、十分量分散されている硬化層を有するので、高い耐摩耗性が得られる。また、第３発明によれば、使用済みの超硬工具を粉砕して超硬合金粒子を得るので、低コストで耐摩耗性部材を製造することができる。   The wear-resistant member produced by the production method of the second invention has a hardened layer in which a sufficient amount of cemented carbide particles having a size capable of sufficiently exhibiting the wear resistance is dispersed. Abrasion resistance is obtained. Further, according to the third invention, since the used cemented carbide tool is pulverized to obtain cemented carbide alloy particles, the wear resistant member can be manufactured at a low cost.

図１は、本発明の耐摩耗性部材の製造方法を示す工程図である。まず、粉砕工程Ｐ１において、粒径が２．０ｍｍよりも大きい超硬合金塊を粉砕して、平均粒径Ｄ５０が６０μｍ〜８００μｍの超硬合金粒子を調製する。上記超硬合金塊は、第３発明のように、コストの面から、使用済み超硬工具を用いることが好ましいが、この超硬合金粒子を製造するために特別に製造してもよい。また、超硬合金塊の大きさは、粉砕して平均粒径Ｄ５０が６０μｍ〜８００μｍの粒子を製造できるほどに十分に大きければよいので、特に上限はない。   FIG. 1 is a process diagram showing a method for producing a wear-resistant member of the present invention. First, in the pulverization step P1, a cemented carbide ingot having a particle size larger than 2.0 mm is pulverized to prepare cemented carbide particles having an average particle size D50 of 60 μm to 800 μm. The cemented carbide ingot is preferably a used cemented carbide tool from the viewpoint of cost as in the third aspect of the invention, but may be specially produced to produce the cemented carbide particles. Further, the size of the cemented carbide ingot is not particularly limited as long as it is sufficiently large to be pulverized to produce particles having an average particle diameter D50 of 60 μm to 800 μm.

超硬合金としては、ＷＣ−Ｃｏ系が好適に用いられるが、それには限定されず、ＷＣが主体となっていれば、ＷＣ−ＴａＣ−Ｃｏ、ＷＣ−ＴｉＣ−Ｃｏ、ＷＣ−ＴｉＣ−ＴａＣ−Ｃｏなど、種々の合金を用いることもできる。   As the cemented carbide, WC-Co system is preferably used, but is not limited thereto, and WC-TaC-Co, WC-TiC-Co, and WC-TiC-TaC- are not limited thereto. Various alloys such as Co can also be used.

粉砕には、ボールミルなどの機械的な粉砕装置を使用する。粉砕の程度は、平均粒径Ｄ５０が６０μｍ〜８００μｍとなるように粉砕することが好ましいが、粉砕後に細粉（たとえば４５μｍ以下のもの）や粗粉（たとえば２０００μｍまたは１０００μｍ以上のもの）をふるいにより除去することにより、平均粒径Ｄ５０が６０μｍ〜８００μｍとなるようにしてもよい。   A mechanical grinding device such as a ball mill is used for grinding. The degree of pulverization is preferably such that the average particle diameter D50 is 60 μm to 800 μm. However, after pulverization, fine powder (for example, 45 μm or less) or coarse powder (for example, 2000 μm or 1000 μm or more) is sieved. By removing, the average particle diameter D50 may be 60 μm to 800 μm.

超硬合金粒子の平均粒子径Ｄ５０を上記の範囲とするのは、粒径が小さすぎると耐摩耗性が十分に発揮できず、反面、粒径が大きすぎると、マトリックスに対する分散性が悪化し、また、硬化層の厚さに対して超硬合金粒子が大きくなりすぎると剥離しやすくなるからである。なお、硬化層の厚さとの関係では、超硬合金粒子は硬化層の厚さの１／３以下であることが好ましい。   The average particle diameter D50 of the cemented carbide particles is in the above range because if the particle size is too small, the wear resistance cannot be sufficiently exhibited. On the other hand, if the particle size is too large, the dispersibility to the matrix deteriorates. Moreover, if the cemented carbide particles become too large with respect to the thickness of the hardened layer, the particles are easily peeled off. In terms of the relationship with the thickness of the hardened layer, the cemented carbide particles are preferably 1/3 or less of the thickness of the hardened layer.

続く混合工程Ｐ２では、上記粉砕工程Ｐ１で得た超硬合金粒子と、硬化層のマトリックス成分となるマトリックス合金粉末とを、所定の割合で混合して、肉盛粉末とする。混合割合は、マトリックス合金粉末が６０質量％〜２０質量％含まれ、超硬合金粒子が４０質量％〜８０質量％含まれるようにする。このような混合割合とするのは、肉盛粉末中の超硬合金粒子が８０質量％以上では、その肉盛粉末から成型される硬化層に割れや剥離が生じやすく、超硬合金粒子が４０質量％以下となると、耐摩耗性を受け持つ超硬合金粒子の割合が少なくなりすぎて、十分な耐摩耗性が得られなくなるからである。   In the subsequent mixing step P2, the cemented carbide particles obtained in the pulverization step P1 and the matrix alloy powder serving as the matrix component of the hardened layer are mixed at a predetermined ratio to obtain a build-up powder. The mixing ratio is such that the matrix alloy powder is contained in an amount of 60% by mass to 20% by mass and the cemented carbide particles are contained in an amount of 40% by mass to 80% by mass. The mixing ratio is such that when the cemented carbide particles in the built-up powder are 80% by mass or more, the hardened layer molded from the built-up powder is easily cracked or peeled, and the cemented carbide particles are 40 This is because if the amount is less than or equal to mass%, the ratio of the cemented carbide particles having wear resistance becomes too small, and sufficient wear resistance cannot be obtained.

上記マトリックス合金としては、耐摩耗性材料としてよく知られているＦｅ−Ｃｒ−Ｃ系の合金や、Ｎｉ基自溶性合金などを用いることができる。   As the matrix alloy, an Fe—Cr—C alloy well known as an abrasion resistant material, a Ni-based self-fluxing alloy, or the like can be used.

続く肉盛工程Ｐ３では、母材上に、上記混合工程Ｐ２で得た肉盛粉末を肉盛溶接する。そして、続く冷却工程Ｐ４では、肉盛溶接後の部材を冷却する。   In the subsequent overlaying process P3, the overlaying powder obtained in the mixing process P2 is overlay welded on the base material. And in the subsequent cooling process P4, the member after build-up welding is cooled.

上記母材としては、炭素鋼、ステンレス鋼などの鉄系基材を用いることができるが、アルミニウムやアルミニウム合金などの軽合金であってもよい。また、母材の形状は、板状（プレート状）、管状など、種々の形状を用いることができ、板状とする場合には、平板状としてもよいし、幅方向に湾曲した形状としてもよい。管状とする場合には、直管状であっても良いし、折れ曲がり部が形成されている形状であってもよい。   As the base material, an iron-based base material such as carbon steel or stainless steel can be used, but a light alloy such as aluminum or aluminum alloy may be used. In addition, the shape of the base material can be various shapes such as a plate shape (plate shape) and a tubular shape. When the shape is a plate shape, it may be a flat plate shape or a shape curved in the width direction. Good. In the case of a tubular shape, it may be a straight tubular shape or a shape in which a bent portion is formed.

肉盛り方法は、ガス溶接、アーク溶接、エレクトロスラグ溶接、プラズマアーク溶接、溶射など、特に制限無く種々の方法を用いることができる。また、上記肉盛粉末を母材上に載置して粉末層を形成し、加熱炉内にてその肉盛粉末を母材表面に溶着させることにより肉盛りする方法を用いることもできる。また、母材と硬化層との密着性を高めるために、肉盛前に、母材表面を粗面処理をしてもよい。   As the overlaying method, various methods such as gas welding, arc welding, electroslag welding, plasma arc welding, thermal spraying and the like can be used without particular limitation. Alternatively, a method may be used in which the build-up powder is placed on a base material to form a powder layer, and the build-up powder is welded to the surface of the base material in a heating furnace. Moreover, in order to improve the adhesiveness between the base material and the hardened layer, the surface of the base material may be roughened before the overlaying.

図２は、図１の肉盛工程Ｐ３および冷却工程Ｐ４に用いることのできる製造装置１０の概略構成を示す図である。この製造装置１０は、耐摩耗性部材としての耐摩耗性プレート１２を連続的に製造できる装置の例である。この製造装置１０は、ローラコンベア１４を備えており、そのローラコンベア１４の上流側から、ホッパ１６、厚み調整板１８、予熱機２０、加熱炉２２、保温機２４が順に設けられている。   FIG. 2 is a diagram showing a schematic configuration of the manufacturing apparatus 10 that can be used in the build-up process P3 and the cooling process P4 of FIG. This manufacturing apparatus 10 is an example of an apparatus that can continuously manufacture the wear-resistant plate 12 as a wear-resistant member. The manufacturing apparatus 10 includes a roller conveyor 14, and a hopper 16, a thickness adjusting plate 18, a preheater 20, a heating furnace 22, and a heat insulator 24 are provided in this order from the upstream side of the roller conveyor 14.

ホッパ１６には、予め調製された肉盛粉末２６が投入され、ローラコンベア１４上を母材２８が一定の速度で移動させられることにより、ホッパ１６内の肉盛粉末２６が母材２８上に順次供給される。母材２８上に供給された肉盛粉末２６の厚みは、厚み調整板１８を通過させられることにより一様とされる。   The build-up powder 26 prepared in advance is put into the hopper 16, and the base material 28 is moved on the roller conveyor 14 at a constant speed, so that the build-up powder 26 in the hopper 16 is placed on the base material 28. Sequentially supplied. The thickness of the build-up powder 26 supplied on the base material 28 is made uniform by passing the thickness adjusting plate 18.

そして、一様の厚みで肉盛粉末２６が載置された母材２８は、予熱機２０を経て加熱炉２２内に搬送される。上記予熱機２０は、加熱炉２２の前での急激な温度変化を緩和するためのものであり、比較的低温で加熱するように設定されている。   Then, the base material 28 on which the overlaying powder 26 is placed with a uniform thickness is conveyed into the heating furnace 22 through the preheater 20. The preheater 20 is for reducing a sudden temperature change in front of the heating furnace 22, and is set to heat at a relatively low temperature.

加熱炉２２は、肉盛粉末２６に含まれるマトリックス合金粉末が溶融可能な温度（たとえば１１００度程度）とされており、加熱炉２２に、肉盛粉末２６が載置された母材２８が搬送されると、マトリックス合金粉末が溶融して、これにより、マトリックス合金粉末が互いに結合して、マトリックス合金粉末間に分散させられた超硬合金粒子がマトリックス合金に保持されるとともに、マトリックス合金が母材２８の表面に溶着して、母材２８の上に硬化層３０が形成される。   The heating furnace 22 is set to a temperature (for example, about 1100 degrees) at which the matrix alloy powder contained in the build-up powder 26 can be melted, and the base material 28 on which the build-up powder 26 is placed is conveyed to the heating furnace 22. As a result, the matrix alloy powder is melted, whereby the matrix alloy powder is bonded to each other, and the cemented carbide particles dispersed between the matrix alloy powders are held in the matrix alloy, and the matrix alloy is A hardened layer 30 is formed on the base material 28 by welding to the surface of the material 28.

次いで、母材２８は、加熱炉２２の下流に設けられている保温機２４へと搬送される。この保温機２４は、加熱炉２２の後での急激な温度変化を緩和するためのものであり、比較的低温で加熱するように設定されている。そして、母材２４がさらに下流に搬送されると、自然冷却される。   Next, the base material 28 is conveyed to a heat retaining device 24 provided downstream of the heating furnace 22. The warmer 24 is for relaxing a rapid temperature change after the heating furnace 22 and is set to heat at a relatively low temperature. And if the base material 24 is conveyed further downstream, it will be naturally cooled.

次に、本発明の実施例を比較例とともに説明する。表１に、実施例および比較例のマトリックス合金の組成、超硬合金粒子の添加割合とその平均粒径Ｄ５０、および、５時間摩耗試験における土砂摩耗量（ｇ／５ｈ）を示す。なお、超硬合金粒子の添加割合は、肉盛粉末、すなわちマトリックス合金と超硬合金粒子との合計重量に対する割合であり、マトリックス合金組成における各元素の質量％は、マトリックス合金中における割合である。また、母材には、軟鋼板（ＳＳ４００）を、超硬合金粒子には、ＷＣ−８％Ｃｏを用いた。

Figure 2005320557
Next, examples of the present invention will be described together with comparative examples. Table 1 shows the compositions of the matrix alloys of Examples and Comparative Examples, the addition ratio of cemented carbide particles and the average particle diameter D50, and the amount of earth and sand wear (g / 5h) in a 5-hour wear test. The addition ratio of the cemented carbide particles is a ratio to the total weight of the overlaying powder, that is, the matrix alloy and the cemented carbide particles, and the mass% of each element in the matrix alloy composition is the ratio in the matrix alloy. . Further, a mild steel plate (SS400) was used as the base material, and WC-8% Co was used as the cemented carbide particles.
Figure 2005320557

また、平均粒径Ｄ５０は、１９種類のふるい（８、１０、１２、１４、１６、２０、２４、２８、３２、３６、４２、５０、６０、８０、１００、１４５、２００、２５０、３５メッシュ）によりふるい分けし、各ふるい上の重量を測定することにより、横軸が粒径、縦軸が累積頻度（％）である粒度加積曲線を作成して求めたものである。表２に、表１に示す平均粒径Ｄ５０＝８００、２００、８０、２０μｍの超硬合金粒子の粒度分布を示す。

Figure 2005320557
The average particle diameter D50 is 19 kinds of sieves (8, 10, 12, 14, 16, 20, 24, 28, 32, 36, 42, 50, 60, 80, 100, 145, 200, 250, 35). This is obtained by preparing a particle size accumulation curve in which the horizontal axis is the particle size and the vertical axis is the cumulative frequency (%) by sieving with a mesh) and measuring the weight on each sieve. Table 2 shows the particle size distribution of cemented carbide particles having an average particle diameter D50 = 800, 200, 80, and 20 μm shown in Table 1.
Figure 2005320557

また、５時間摩耗試験は、図３の概略図に示すように、円盤状の銅板４０上に珪砂６号（４２）を敷き詰め、耐摩耗性プレート１２（２ｃｍ×２ｃｍ）を、硬化層３０を下向きにして所定の荷重（４ｋｇ）を下向きに加えた状態で、銅板４０に沿って摺動させることを５時間継続する試験である。   Further, in the 5-hour wear test, as shown in the schematic diagram of FIG. 3, silica sand No. 6 (42) is spread on the disk-shaped copper plate 40, the wear-resistant plate 12 (2 cm × 2 cm) is applied, and the hardened layer 30 is applied. In this test, sliding along the copper plate 40 is continued for 5 hours in a state where a predetermined load (4 kg) is applied downward.

表１において、マトリックス合金組成が同一であり、平均粒径Ｄ５０も同じであるが、超硬合金粒子の添加割合が異なる実施例１と実施例８と比較例３との比較、および実施例６と実施例１３と比較例４との比較から、超硬合金粒子の添加割合が少なすぎると、土砂摩耗量が多くなること、すなわち、耐摩耗性が不十分となることが分かる。なお、超硬合金粒子の添加割合を多くして、８５％以上とすると、前述のように、割れや剥離が生じてしまい、土砂摩耗試験を行うことができなかった。   In Table 1, the matrix alloy composition is the same and the average particle diameter D50 is the same, but the addition ratio of the cemented carbide particles is different between Example 1 and Example 8 and Comparative Example 3, and Example 6 From comparison between Example 13 and Comparative Example 4, it can be seen that if the addition ratio of the cemented carbide particles is too small, the amount of earth and sand wear increases, that is, the wear resistance becomes insufficient. In addition, when the addition ratio of the cemented carbide particles was increased to 85% or more, as described above, cracking and peeling occurred, and the earth and sand wear test could not be performed.

また、マトリックス合金組成が同一であり、超硬合金粒子の添加割合も同じであるが、平均粒径Ｄ５０が異なる実施例１と実施例６と実施例７と比較例１との比較、および実施例８と実施例１３と実施例１４と比較例２との比較から、超硬合金粒子の添加割合が多くても、平均粒径Ｄ５０が小さすぎると、耐摩耗性が不十分であることが分かる。なお、平均粒径Ｄ５０を８００μｍよりも大きくすると、表面の凹凸が大きくなりすぎ、また、マトリックス合金に対する分散が不十分となってしまうので、不適当である。   In addition, the matrix alloy composition is the same, and the addition ratio of the cemented carbide particles is also the same, but the average particle diameter D50 is different, and the comparison between Example 1, Example 6, Example 7, and Comparative Example 1 is carried out. From comparison between Example 8, Example 13, Example 14, and Comparative Example 2, even if the addition ratio of the cemented carbide particles is large, if the average particle diameter D50 is too small, the wear resistance may be insufficient. I understand. In addition, if the average particle diameter D50 is larger than 800 μm, the surface unevenness becomes excessively large and the dispersion with respect to the matrix alloy becomes insufficient.

さらに、実施例１〜７の比較、および実施例８〜１４の比較から、平均粒径Ｄ５０の大きさ、および超硬合金粒子の添加割合が適当であれば、マトリックス合金の組成に関係なく十分な耐摩耗性が得られることが分かる。   Furthermore, from the comparison of Examples 1 to 7 and the comparison of Examples 8 to 14, if the average particle size D50 and the addition ratio of the cemented carbide particles are appropriate, it is sufficient regardless of the composition of the matrix alloy. It can be seen that excellent wear resistance can be obtained.

以上、本発明の実施の形態を説明したが、本発明は上述の実施形態に限定されず、当業者の知識に基づいて種々の変更、改良を加えた態様で実施することができる。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

本発明の耐摩耗性部材の製造方法を示す工程図である。It is process drawing which shows the manufacturing method of the wear-resistant member of this invention. 図１の肉盛工程および冷却工程に用いることのできる製造装置の概略構成を示す図である。It is a figure which shows schematic structure of the manufacturing apparatus which can be used for the build-up process and cooling process of FIG. 耐摩耗性を評価するための５時間摩耗試験の試験方法を示す概略図である。It is the schematic which shows the test method of the 5-hour abrasion test for evaluating abrasion resistance.

符号の説明Explanation of symbols

１０：製造装置、 １２：耐摩耗性プレート（耐摩耗性部材）、 １４：ローラコンベア、 １６：ホッパ、 １８：厚み調整板、 ２０：予熱機、 ２２：加熱炉、 ２４：保温機、 ２６：肉盛粉末、 ２８：母材、 ３０：硬化層、 ４０：銅板、 ４２：珪砂６号 10: Manufacturing apparatus, 12: Abrasion resistant plate (abrasion resistant member), 14: Roller conveyor, 16: Hopper, 18: Thickness adjusting plate, 20: Preheater, 22: Heating furnace, 24: Insulator, 26: Overlay powder, 28: Base material, 30: Hardened layer, 40: Copper plate, 42: Silica sand No. 6

Claims (3)

母材上に、該母材よりも硬い硬化層が形成されている耐摩耗性部材であって、
該硬化層は、マトリックス合金が６０質量％〜２０質量％であり、該マトリックス合金に平均粒径Ｄ５０が６０μｍ〜８００μｍの超硬合金粒子が４０質量％〜８０質量％分散されていることを特徴とする耐摩耗性部材。 A wear-resistant member in which a hardened layer harder than the base material is formed on the base material,
In the hardened layer, the matrix alloy is 60% by mass to 20% by mass, and cemented carbide particles having an average particle diameter D50 of 60 μm to 800 μm are dispersed in the matrix alloy by 40% by mass to 80% by mass. Wear resistant member. 母材上に、該母材よりも硬い硬化層が形成されている耐摩耗性部材の製造方法であって、
粒径が２．０ｍｍよりも大きい超硬合金塊を粉砕して平均粒径Ｄ５０が６０μｍ〜８００μｍの超硬合金粒子を得る粉砕工程と、
該粉砕工程で得た超硬合金粒子とマトリックス合金粉末とを混合して、平均粒径Ｄ５０が６０μｍ〜８００μｍの超硬合金粒子を４０質量％〜８０質量％含む肉盛粉末を得る混合工程と、
該混合工程で得た肉盛粉末を母材上に肉盛溶接することにより、前記硬化層を形成する肉盛工程と
を含むことを特徴とする耐摩耗性部材の製造方法。 A method of manufacturing a wear-resistant member in which a hardened layer harder than the base material is formed on the base material,
A crushing step of crushing a cemented carbide ingot having a particle size larger than 2.0 mm to obtain cemented carbide particles having an average particle size D50 of 60 μm to 800 μm;
A mixing step of mixing the cemented carbide particles obtained in the pulverization step with the matrix alloy powder to obtain a built-up powder containing 40% by mass to 80% by mass of cemented carbide particles having an average particle size D50 of 60 μm to 800 μm ,
A build-up process for forming the hardened layer by overlay welding the build-up powder obtained in the mixing process on a base material. 前記超硬合金塊として、使用済みの超硬工具を用いることを特徴とする請求項２の耐摩耗性部材の製造方法。 3. The method for producing a wear-resistant member according to claim 2, wherein a used cemented carbide tool is used as the cemented carbide alloy lump.
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