JPH0754094A - Cemented carbide - Google Patents
Cemented carbideInfo
- Publication number
- JPH0754094A JPH0754094A JP20066193A JP20066193A JPH0754094A JP H0754094 A JPH0754094 A JP H0754094A JP 20066193 A JP20066193 A JP 20066193A JP 20066193 A JP20066193 A JP 20066193A JP H0754094 A JPH0754094 A JP H0754094A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- particle diameter
- toughness
- cemented carbide
- particle size
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は超硬合金に関し、特にト
ルネル掘削用シールド掘進機に取付けられるカッタービ
ットあるいは工作機械用切削工具に用いられる超硬合金
に関し、超硬合金製チップを取付けて使用する岩盤ある
いはコンクリート切削用のカッター等、超硬合金を使用
する各種製品に有利に適用しうる超硬合金に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cemented carbide, and more particularly to a cemented carbide used for a cutter bit attached to a shield machine for excavation of torunels or a cutting tool for machine tools. The present invention relates to a cemented carbide that can be advantageously applied to various products that use cemented carbide, such as a rock or a cutter for cutting concrete.
【０００２】[0002]
【従来の技術】カッタービット等の建設工具に使用され
ている従来の超硬合金はＷＣ粒径が１〜１０μｍで、か
つ、比較的粒径が均等な材質が多く、微粒〜粗粒を混粒
化した材質のものはなく、また結合相のＣｏ含有量は７
〜１６重量％のものが一般的である。2. Description of the Related Art Conventional cemented carbide used for construction tools such as cutter bits has a WC grain size of 1 to 10 μm, and many of the materials have a relatively uniform grain size. There is no granular material, and the Co content of the binder phase is 7
Generally, about 16 to 16% by weight is used.
【０００３】[0003]
【発明が解決しようとする課題】カッタービット等、超
硬合金工具の長寿命化を達成するためには、超硬合金の
硬さと靱性を共に向上させて耐摩耗性と耐欠損性を高め
る必要がある。ＷＣ−Ｃｏ超合金では、一般に硬質相の
ＷＣ粒径を小さくするか、または結合相のＣｏ量を少な
くするにつれてＷＣ粒境界のＣｏ層の厚さが低下するた
め、硬さは向上するが靱性は低下する傾向がある。ま
た、ＷＣ粒径を大きくするか、またはＣｏ量を多くすれ
ば逆に靱性は向上するが硬さは低下する。以上のよう
に、硬さと靱性を両立させて共に向上させることは困難
であり、これが従来材の問題点である。In order to achieve a long service life of a cemented carbide tool such as a cutter bit, it is necessary to improve both hardness and toughness of the cemented carbide to enhance wear resistance and fracture resistance. There is. In a WC-Co superalloy, generally, as the WC grain size of the hard phase is made smaller or the Co amount of the binder phase is made smaller, the thickness of the Co layer at the WC grain boundary is reduced, so that the hardness is improved but the toughness is improved. Tends to decline. On the contrary, if the WC grain size is increased or the Co amount is increased, the toughness is improved but the hardness is decreased. As described above, it is difficult to make both hardness and toughness compatible with each other, and this is a problem of the conventional material.
【０００４】本発明は上記技術水準に鑑み、硬さと靱性
を両立させて共に向上させた超硬合金を提供しようとす
るものである。In view of the above technical level, the present invention aims to provide a cemented carbide having both improved hardness and toughness.
【０００５】[0005]
【課題を解決するための手段】本発明はＷＣを硬質相、
Ｃｏを結合相として焼結されてなる超硬合金において、
１．５〜３μｍ粒径のＷＣ粉末：２０〜３０ｖｏｌ％、
５〜８μｍ粒径のＷＣ粉末：２０〜３０ｖｏｌ％及び１
０〜３０μｍ粒径のＷＣ粉末：４０〜６０ｖｏｌ％の粒
径分布を有するＷＣ粉末に、Ｃｏ：７〜１０重量％含有
させた組成よりなることを特徴とする超硬合金である。SUMMARY OF THE INVENTION The present invention uses WC as a hard phase,
In a cemented carbide that is sintered with Co as a binder phase,
WC powder having a particle size of 1.5 to 3 μm: 20 to 30 vol%,
WC powder having a particle size of 5 to 8 μm: 20 to 30 vol% and 1
WC powder having a particle size of 0 to 30 μm: A WC powder having a particle size distribution of 40 to 60% by volume, and a composition of Co: 7 to 10% by weight.
【０００６】[0006]
【作用】本発明の超硬合金は硬質相であるＷＣの粒径を
１．５〜３μｍの比較的微粒なものから、従来例には使
われていない１０〜３０μｍの粒大粒まで広範囲に分布
させたものである。本発明は硬さを維持した上で靱性を
向上させることにある。靱性を上げるにはＷＣの粗粒化
によって結合相であるＣｏ層を厚くすることが適切であ
るので、先ず、１０〜３０μｍの粗大粒を主体として、
この粒径のものを全体の４０〜６０ｖｏｌ％になるよう
にした。しかし、粗大粒のみでは硬さが得られないの
で、ＷＣ層を緻密にして硬さを確保するため、粗大粒の
隙間を中粒、細粒のＷＣ粒子で埋めるようにしたもので
ある。この場合、粗大ＷＣ粒間を埋めて緻密化し過ぎる
と結合相であるＣｏ層が薄くなって靱性の向上が困難と
なるので、１．５〜３μｍの粒径（細粒）のものを２０
〜３０ｖｏｌ％、５〜８μｍの粒径（中粒）のものを２
０〜３０ｖｏｌ％として、全体の平均粒径は従来材に比
べてかなり粗大側（全体の平均粒径：約８μｍ）になる
ようにしたものである。また、結合相としてのＣｏ含有
量は硬さを従来材以上に維持するために、１０ｗｔ％以
下とし、靱性を確保するために７ｗｔ％以上とした。In the cemented carbide of the present invention, the hard phase WC has a particle size ranging from relatively fine particles of 1.5 to 3 μm to large particles of 10 to 30 μm which are not used in conventional examples. It was made. The present invention is to improve toughness while maintaining hardness. In order to increase the toughness, it is appropriate to thicken the Co layer which is the binder phase by coarsening WC. Therefore, first, coarse grains of 10 to 30 μm are mainly used,
The particles having this particle size were made to be 40 to 60 vol% of the whole. However, since the hardness cannot be obtained only with the coarse particles, the gaps of the coarse particles are filled with medium and fine WC particles in order to make the WC layer dense and secure the hardness. In this case, if the coarse WC grains are filled with too much density, the Co layer as the binder phase becomes thin and it becomes difficult to improve the toughness.
2 to 30 to 30 vol% and 5 to 8 μm particle size (medium particle)
The total average particle size is set to 0 to 30% by volume so that the overall average particle size is considerably coarser than the conventional material (total average particle size: about 8 μm). Further, the Co content as the binder phase was set to 10 wt% or less in order to maintain the hardness higher than that of the conventional material, and 7 wt% or more to secure the toughness.
【０００７】本発明の超硬合金と従来の超硬合金材のき
裂部のミクロ組織の模式図を図１、図２に示す。従来材
では、図２に示すように、ＷＣ粒径が比較的均等で、粗
大粒を含まないため、き裂１はＷＣ粒２の境界に沿って
直線的に伝播し易く、破壊に要するエネルギーが小さく
なるため低靱性となる。一方、本発明による粗大粒を混
粒化した材質では、図１に示すように、き裂が粗大ＷＣ
粒３の境界に沿って回り込む経路を伝播し易く、破壊に
要するエネルギーが大きくなるとともに、粗大粒３がき
裂の伝播阻止効果を与える。したがって靱性が向上す
る。粗大粒３のみの均等粒径では、公知のようにＣｏ層
４が厚くなるため、靱性は向上するが、硬さが得られな
い。本発明の材質では、これを補うため１．５〜８μｍ
の比較的小粒径のＷＣ粒５を混粒化してＣｏ層の厚さを
従来材並びに保っているため、硬さ低下を防止できる。1 and 2 are schematic diagrams of the microstructures of the cracked portions of the cemented carbide of the present invention and a conventional cemented carbide material. In the conventional material, as shown in FIG. 2, since the WC grain size is relatively uniform and no coarse grains are included, the crack 1 easily propagates linearly along the boundary of the WC grains 2 and the energy required for fracture is increased. Becomes small, resulting in low toughness. On the other hand, in the material in which coarse particles are mixed according to the present invention, as shown in FIG.
It is easy to propagate along a path that goes around along the boundaries of the grains 3, and the energy required for fracture increases, and the coarse grains 3 provide a crack propagation inhibiting effect. Therefore, the toughness is improved. With the coarse particles 3 alone, the Co layer 4 becomes thick as is known, so that the toughness is improved, but the hardness cannot be obtained. In the material of the present invention, in order to compensate for this, 1.5 to 8 μm
Since the WC grains 5 having a relatively small grain size are mixed to maintain the thickness of the Co layer as well as the conventional material, it is possible to prevent a decrease in hardness.
【０００８】[0008]
【実施例】本発明実施例の組成、ビッカース硬さ、破壊
靱性及びカッタビットを製作して礫層切削を行った結果
を従来材２種類と比較して表１に示す。この実施例で
は、原料として平均粒径２０μｍ（粒径分布：１０〜２
５μｍ）の粗大粒ＷＣ粉末を５０ｖｏｌ％、平均粒径６
μｍ（粒径分布：５．５〜７．５μｍ）と平均粒径２．
５μｍ（粒径分布：１．８〜３μｍ）のＷＣ粉末を各々
２５ｖｏｌ％の混粒とし、Ｃｏを９ｗｔ％配合した。得
られた超硬合金は混練時に若干粉砕されるため、その
分、配合粒径とやゝ異なるが、その粒度分布は原料のそ
れと略同じである。EXAMPLES Table 1 shows the composition, Vickers hardness, fracture toughness, and cutter bit produced in the examples of the present invention and the results of cutting the gravel layer in comparison with two types of conventional materials. In this example, the raw material has an average particle size of 20 μm (particle size distribution: 10 to 2).
5 vol.) 50% coarse WC powder, average particle size 6
μm (particle size distribution: 5.5 to 7.5 μm) and average particle size 2.
WC powder having a particle size distribution of 5 μm (particle size distribution: 1.8 to 3 μm) was mixed with 25 vol%, and 9 wt% of Co was mixed. Since the obtained cemented carbide is slightly crushed during kneading, its particle size distribution is slightly different from that of the raw material, but its particle size distribution is almost the same as that of the raw material.
【０００９】従来材１は現状のカッタビットに使われて
いる材質であるが、この実施例材の方が硬さ、靱性共に
優れており、切削テスト結果でも従来材１が欠損した条
件下で、この実施例材は欠損していない。また、従来材
２は平均粒径が１．５μｍと比較的微粒の均等粒径で、
Ｃｏ量も従来材１より少なくして硬さを上げたものであ
り、それだけ実施例材より硬さは高いが、靱性が劣って
いる。The conventional material 1 is the material currently used for the cutter bit, but the material of this embodiment is superior in hardness and toughness, and the cutting test results show that the conventional material 1 is missing. The material of this example is not defective. Further, the conventional material 2 has an average particle diameter of 1.5 μm and a relatively fine uniform particle diameter,
The Co content is lower than that of the conventional material 1 to increase the hardness. Although the hardness is higher than that of the example material, the toughness is inferior.
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【発明の効果】本発明の超硬合金は従来材に比べて靱性
及び耐欠損性に優れており、硬さも低下することなく現
状のカッタービット材である従来材より優れている。The cemented carbide of the present invention is superior in toughness and fracture resistance to the conventional material, and is superior to the conventional material which is the current cutter bit material without lowering the hardness.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の超硬合金の一実施例のき裂部のミクロ
組織の模式図。FIG. 1 is a schematic diagram of a microstructure of a crack portion of an embodiment of a cemented carbide of the present invention.
【図２】従来の超硬合金の一態様のミクロ組織の模式
図。FIG. 2 is a schematic diagram of a microstructure of one embodiment of a conventional cemented carbide.
Claims (1)
されてなる超硬合金において、１．５〜３μｍ粒径のＷ
Ｃ粉末：２０〜３０ｖｏｌ％、５〜８μｍ粒径のＷＣ粉
末：２０〜３０ｖｏｌ％及び１０〜３０μｍ粒径のＷＣ
粉末：４０〜６０ｖｏｌ％の粒径分布を有するＷＣ粉末
に、Ｃｏ：７〜１０重量％含有させた組成よりなること
を特徴とする超硬合金。1. A cemented carbide obtained by sintering WC as a hard phase and Co as a binder phase, and having a grain size of 1.5 to 3 μm.
C powder: 20 to 30 vol%, WC powder having a particle size of 5 to 8 μm: 20 to 30 vol% and WC having a particle size of 10 to 30 μm
Powder: Cemented carbide characterized by having a composition in which Co: 7 to 10 wt% is contained in WC powder having a particle size distribution of 40 to 60 vol%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20066193A JP3165564B2 (en) | 1993-08-12 | 1993-08-12 | Cemented carbide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20066193A JP3165564B2 (en) | 1993-08-12 | 1993-08-12 | Cemented carbide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0754094A true JPH0754094A (en) | 1995-02-28 |
| JP3165564B2 JP3165564B2 (en) | 2001-05-14 |
Family
ID=16428125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20066193A Expired - Fee Related JP3165564B2 (en) | 1993-08-12 | 1993-08-12 | Cemented carbide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3165564B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534341A (en) * | 2012-02-27 | 2012-07-04 | 中南大学 | Method for eliminating WC (Wolfram Carbide) grain fragmentation at phase boundary between ultra-coarse grain hard alloy and super-coarse grain hard alloy |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773472B (en) * | 2012-05-30 | 2014-12-10 | 江汉石油钻头股份有限公司 | Polycrystalline diamond drill bit matrix powder |
-
1993
- 1993-08-12 JP JP20066193A patent/JP3165564B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534341A (en) * | 2012-02-27 | 2012-07-04 | 中南大学 | Method for eliminating WC (Wolfram Carbide) grain fragmentation at phase boundary between ultra-coarse grain hard alloy and super-coarse grain hard alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3165564B2 (en) | 2001-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8292985B2 (en) | Materials for enhancing the durability of earth-boring bits, and methods of forming such materials | |
| EP1309732B1 (en) | Method of producing an abrasive product containing diamond | |
| US5496638A (en) | Diamond tools for rock drilling, metal cutting and wear part applications | |
| Fang et al. | Fracture resistant super hard materials and hardmetals composite with functionally designed microstructure | |
| US6915866B2 (en) | Polycrystalline diamond with improved abrasion resistance | |
| US6098731A (en) | Drill bit compact with boron or beryllium for fracture resistance | |
| US8435626B2 (en) | Thermal degradation and crack resistant functionally graded cemented tungsten carbide and polycrystalline diamond | |
| GB2367827A (en) | Polcrystalline diamond materials | |
| GB2393449A (en) | Bit bodies comprising spherical sintered tungsten carbide | |
| CA2199780A1 (en) | Rock bit with hardfacing material incorporating spherical cast carbide particles | |
| AU4016995A (en) | Composite cermet articles and method of making | |
| CA2196494A1 (en) | Hard facing material for rock bits | |
| KR20090035722A (en) | Abrasive compacts | |
| JPH0941006A (en) | Layered composite carbide article and production | |
| EP2570245B1 (en) | Hardfacing composition having a specific particle size distribution | |
| CN105132779A (en) | Tungsten-carbide-based cemented carbide and preparation method thereof | |
| KR20090042288A (en) | Abrasive compacts | |
| US9103004B2 (en) | Hardfacing composition and article having hardfacing deposit | |
| JPH0754094A (en) | Cemented carbide | |
| CN1894431A (en) | Cemented carbide tools for mining and construction applications and method of making the same | |
| JP2668962B2 (en) | End mill made of tungsten carbide based cemented carbide with excellent fracture resistance | |
| JPH0768570B2 (en) | Compound cutting chip | |
| JP2005256076A (en) | Cemented carbide | |
| JPH05311313A (en) | Wc-base sintered hard alloy | |
| JPH068498U (en) | Bit for shield cutter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010130 |
|
| LAPS | Cancellation because of no payment of annual fees |