JPS59219500A - Diamond sintered body and treatment thereof - Google Patents
Diamond sintered body and treatment thereofInfo
- Publication number
- JPS59219500A JPS59219500A JP9169183A JP9169183A JPS59219500A JP S59219500 A JPS59219500 A JP S59219500A JP 9169183 A JP9169183 A JP 9169183A JP 9169183 A JP9169183 A JP 9169183A JP S59219500 A JPS59219500 A JP S59219500A
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- diamond
- diamond sintered
- base material
- composite
- 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.)
- Pending
Links
Abstract
Description
【発明の詳細な説明】
（イ）技術分野
本発明は切削工具、岩石掘削工具等に用いられる超高圧
、高温焼結によるダイヤモンド焼結体に関するもので特
にその工具としての性能を著しく改良したものである。[Detailed description of the invention] (a) Technical field The present invention relates to a diamond sintered body produced by ultra-high pressure and high temperature sintering for use in cutting tools, rock excavation tools, etc., and in particular, a diamond sintered body that has significantly improved performance as a tool. It is.
従来技術とその問題点
ダイヤモンドの粉末を金属を結合材としてダイヤモンド
が安定な超高圧、高温下で焼結して得られるダイヤモン
ド焼結体は工具材料の中では最な高硬度であるダイヤモ
ンドの特徴を持ち、単結晶ダイヤモンドの如くヘキ開に
よって低応力で破損することもないため、切削工具、伸
線ダイス、ドレッサー、岩石掘削工具など多方面に工具
として用いられている。このダイヤモンド焼結体には用
途によって各種の構造、形状のものがあるが、切削工具
、ドレッサー、岩石掘削工具には一般に第１図に示した
ようなダイヤモンド焼結体の層が超硬合金等の剛性の高
い母材に接合されたものが用いられている。このような
構造の焼結体については例えば特開昭４６−５２０４号
の如くダイヤ−Ｆ−ンド焼結体の層がＷＣＣ超超硬合金
基材直接接合されて成る焼結体や、特開昭５４−４５３
１３同５６−５５０６号の如く中間接合層を介してダイ
ヤモンド焼結体の層が超硬合金等の基材に接合された例
が知られている。現在使用されているこのような焼結体
のダイヤモンド焼結体層はダイヤモンド粒子の結合材と
してＣＯ等の鉄族金属を用いているものが多い。鉄族金
属は黒鉛からダイヤモンドを合成する際の溶媒として用
いられるもので、超高圧下における焼結時にダイヤモン
ド粉末の一部を溶解し、ダイヤモンド粒子相互を強固に
焼結せしめる作用をすると考えられている。この鉄族金
属は焼結前にダイヤモンド粉末と混合されたものを用い
ても良いし、特開昭４６−５２０４号の如く焼結時に基
材ＷＣ−Ｃｏの結合材融液をダイヤモンド粉末中に溶浸
せしめる方法も知られている。このようなダイヤモンド
焼結体は耐摩耗性強度が優れており、従来単結晶ダイヤ
モンドを用いていた用途でも優れた性能を発揮するが、
一方耐熱性の点では大きな制約がある。ダイヤモンドは
大気中では約９Ｃ１Ｏ″Ｃ以上で表面より黒鉛化が生じ
るが、真空又は不活性ガス中では１４００・Ｃ前後でも
黒鉛化は生じ難い。しかるに前述した従来のダイヤモン
ド焼結体を加熱すると約７５０°Ｃて工具性能の劣化が
見られる。このことは切削工具や掘削工具の如く使用時
に刃先が高温になるような使用条件下では当然性能が低
下することを意味する。従来のダイヤモンド焼結体がダ
イヤモンド単味より位温で劣化する原因として考えられ
るのは鉄族金属結合材とダイヤモンドの熱膨張係数の差
が大きく、加熱によって焼結体中の熱応力が大きくなり
組織が破壊されることと、鉄族金属がダイヤモンドの黒
鉛化を促進する作用を有することである。ダイヤモンド
焼結体の耐熱性を改良する方法として超硬合金等の基材
に接合されていない焼結体を作成し、このものを王水等
に浸漬して加熱し焼結体中の金属結合相を溶出せしめる
方法が考えられている。（特開昭５３−１１４５８９
）これによりダイヤモンド焼結体の耐熱性は１２００℃
までの加熱に耐えるようになるとされている。しかしな
がら金属結合相が抜けて焼結体全体に空孔が存在するた
め、焼結体の強度は大巾に低下し、工具としての強靭性
の点Ｑ不充分のものしか得られない。またこの方法では
ダイヤモンド焼結体を工具支持体に接合する方法が大き
な制約を受は強固な接合が困難である。Conventional technology and its problems The diamond sintered body obtained by sintering diamond powder with metal as a binder under ultra-high pressure and high temperature where diamond is stable has the highest hardness among tool materials. Because it does not break due to low stress due to cleavage like single-crystal diamond, it is used in a variety of tools such as cutting tools, wire drawing dies, dressers, and rock excavation tools. This diamond sintered body has various structures and shapes depending on the purpose, but cutting tools, dressers, and rock drilling tools generally have a layer of diamond sintered body made of cemented carbide as shown in Figure 1. A material bonded to a highly rigid base material is used. Regarding sintered bodies having such a structure, for example, there is a sintered body in which a layer of a diamond ferrite sintered body is directly bonded to a WCC cemented carbide base material as disclosed in Japanese Patent Application Laid-open No. 46-5204, and Showa 54-453
No. 13, No. 56-5506, there is known an example in which a layer of a diamond sintered body is bonded to a base material such as a cemented carbide via an intermediate bonding layer. Many of the diamond sintered body layers of such sintered bodies currently in use use an iron group metal such as CO as a binding material for diamond particles. Iron group metals are used as solvents when synthesizing diamond from graphite, and are thought to dissolve part of the diamond powder during sintering under ultra-high pressure, thereby sintering the diamond particles together. There is. This iron group metal may be mixed with diamond powder before sintering, or as in JP-A-46-5204, a binder melt of base material WC-Co is added to diamond powder during sintering. Infiltration methods are also known. This type of diamond sintered body has excellent wear resistance and strength, and exhibits excellent performance in applications that conventionally used single-crystal diamond.
On the other hand, there are major limitations in terms of heat resistance. Graphitization occurs from the surface of diamond at temperatures above about 9C1O''C in the atmosphere, but graphitization hardly occurs in vacuum or inert gas even at around 1400C.However, when the conventional diamond sintered body mentioned above is heated, Deterioration of tool performance is seen at 750°C. This means that the performance naturally deteriorates under usage conditions such as cutting tools and drilling tools where the cutting edge becomes hot during use. Conventional diamond sintering A possible reason why the sintered body deteriorates at temperatures higher than that of diamond alone is that there is a large difference in the coefficient of thermal expansion between the iron group metal binding material and diamond, and heating increases thermal stress in the sintered body and destroys the structure. In addition, iron group metals have the effect of promoting graphitization of diamond.As a method to improve the heat resistance of diamond sintered bodies, sintered bodies that are not bonded to a base material such as cemented carbide are created. However, a method has been considered in which this material is immersed in aqua regia or the like and heated to elute the metal binder phase in the sintered material. (JP-A-53-114589
) As a result, the heat resistance of the diamond sintered body is 1200℃.
It is said that it can withstand heating up to. However, since the metal binding phase is removed and pores are present throughout the sintered body, the strength of the sintered body is greatly reduced, and the toughness Q of the sintered body is insufficient for use as a tool. In addition, this method has major limitations on the method of joining the diamond sintered body to the tool support, making it difficult to achieve a strong joint.
（ロ）発明の構成
本発明はこのような従来の焼結体の欠点を解消した新た
なダイヤモンド焼結体を提供することを目的とする。ダ
イヤモンド焼結体を工具として使用する場合、例えば切
削工具の場合に最も高温となるのは被加工材と接触する
刃先先端である。(B) Structure of the Invention The object of the present invention is to provide a new diamond sintered body that eliminates the drawbacks of the conventional sintered bodies. When a diamond sintered body is used as a tool, for example, in the case of a cutting tool, the highest temperature is at the tip of the cutting edge that comes into contact with the workpiece.
この部分の温度勾酸は大きく、被加工材との接触点から
離れると急激に温度は低下している。従って例えば第２
図の如く円板形状焼結体の表層部のみ耐熱性を向上して
おけば工具としての性能が大［１］に改良されるのであ
る。本発明はこの点に着目して第２図の如くダイヤモン
ドと鉄族金属結合相からなるダイヤモンド焼結体の層が
超硬合金基材に超高圧焼結時に接合された複合焼結体の
ダイヤモンド焼結体層の表層部の結合相を除去したもの
である。こ〜れにより工具として用いるときの耐熱性が
大巾に向上する。またダイヤモンド焼結体内部は結合相
が存在しており焼結体全体としての強度低下は少い。ま
た内部は空孔が無いため熱伝導度も低下せず、刃先に生
じた熱を発散させる上でも有効である。本発明焼結体で
はダイヤモンド焼結体層の厚みは通常０．６〜５闘でこ
れが超硬合金基材上に超高圧下焼結時に接合されており
、そのダイヤモンド焼結体層の表層部の少くとも０．２
ｍｍの領域で鉄族金属結合相の大部分を除去したもの
である。本発明焼結体の製造に当っては例えば前記した
特開昭４６−５２０４号、５４−４５３１３号、５６−
５５５０６号等に記載された方法を採ることができる。The temperature gradient in this part is large, and the temperature drops rapidly away from the point of contact with the workpiece. Therefore, for example, the second
As shown in the figure, if the heat resistance of only the surface layer of the disc-shaped sintered body is improved, the performance as a tool can be greatly improved [1]. Focusing on this point, the present invention has developed a diamond composite sintered body in which a layer of a diamond sintered body consisting of diamond and an iron group metal bonding phase is bonded to a cemented carbide base material during ultra-high pressure sintering, as shown in FIG. The binder phase on the surface layer of the sintered body layer has been removed. This greatly improves the heat resistance when used as a tool. Furthermore, since a binder phase exists inside the diamond sintered body, the strength of the sintered body as a whole does not decrease much. Also, since there are no holes inside, the thermal conductivity does not decrease, and it is effective in dissipating heat generated at the cutting edge. In the sintered body of the present invention, the thickness of the diamond sintered body layer is usually 0.6 to 5 mm, and this is bonded to the cemented carbide base material during sintering under ultra-high pressure, and the surface layer of the diamond sintered body layer is at least 0.2 of
Most of the iron group metal binding phase has been removed in the mm region. In producing the sintered body of the present invention, for example, the above-mentioned JP-A-46-5204, 54-45313, 56-
The method described in No. 55506 etc. can be used.
これ等の方法により０．３〜５ ｍｍのダイヤモンド焼
結体層が超硬合金基材上に接合された複合焼結体を得る
。この複合焼結体のダイヤモンド焼結体の表層部から鉄
族金属結合相を除去するにはスポンヂ状の物質に塩酸水
溶液を含ませ、これを焼結体の表面に置いて直流電圧を
加え電解除去する方法が最も有効である。このような方
法により基材の超硬合金を酸により傷めることなくダイ
ヤモンド焼結体の表層部のみ結合相を除去することがで
きる。By these methods, a composite sintered body in which a 0.3 to 5 mm diamond sintered body layer is bonded onto a cemented carbide base material is obtained. To remove the iron group metal binder phase from the surface layer of the diamond sintered body of this composite sintered body, a sponge-like substance is soaked with an aqueous hydrochloric acid solution, placed on the surface of the sintered body, and a DC voltage is applied to electrolyze it. The most effective method is to remove it. By such a method, the binder phase can be removed only from the surface layer of the diamond sintered body without damaging the cemented carbide base material with acid.
（ハ）発明の効果
本発明によれば従来の複合焼結ダイヤモンドの強度を害
うことなく、耐熱性不足による工具としての性能の限界
を大きく改善することが可能である。以下実施例を記す
。(c) Effects of the Invention According to the present invention, it is possible to greatly improve the performance limitations of conventional composite sintered diamonds as tools due to insufficient heat resistance, without impairing their strength. Examples will be described below.
実施例１
超高圧下で焼結して得られた第１図の構造を有する直径
２６ｍｍ、ダイヤモンド焼結体部の厚みが１闘でＷＣ−
１０％ＣＯからなる厚さ２５πｍの基材こ接合された複
合焼結体を作成した。ダイヤモンド焼結体部は平均粒度
５μのダイヤモンド粒子を体積で９０％含有し、残部が
ＣＯ結合相からなるものである。この焼結体のダイヤモ
ンド焼結体層の表面が希塩酸水を含んだプラスチックの
スポンヂに接するように置き、超硬合金基材とスポンヂ
の下に置いた電極との間に１０Ｖの直流電圧を加えて２
時間放置しｔコ。通電を断ち、焼結体を放電加工により
切断し多数の三角形状に分割した。断面を研摩して調べ
たところダイヤモンド焼結体の表面から３．５ ｍｍの
領域の結合金属ＣＯ相が殆んど電解除去されていた。こ
の焼結体を別の超硬合金台金にロー付してアルミナ磁器
の切削加工テストを行なった。比較のため同様複合焼結
体の米処理のもので同一形状工具を作成して用いた。切
削テスト条件は切削速度６０１分切込み０．１５ｆｆ１
ｍ、送り００２痛π／回転で水溶性切削剤をかけながら
行なった。Example 1 A diamond sintered body having the structure shown in Fig. 1 obtained by sintering under ultra-high pressure has a diameter of 26 mm and a thickness of WC-
A composite sintered body made of 10% CO and having a thickness of 25πm was bonded to the base material. The diamond sintered body portion contained 90% by volume of diamond particles with an average particle size of 5 μm, and the remainder consisted of a CO binding phase. The surface of the diamond sintered body layer of this sintered body was placed in contact with a plastic sponge containing dilute hydrochloric acid water, and a 10V DC voltage was applied between the cemented carbide base material and the electrode placed under the sponge. te2
Leave it for a while. The electricity was turned off, and the sintered body was cut into many triangular pieces by electric discharge machining. When the cross section was polished and examined, it was found that most of the bound metal CO phase in a region 3.5 mm from the surface of the diamond sintered body had been electrolytically removed. This sintered body was brazed onto another cemented carbide base metal, and a cutting test for alumina porcelain was conducted. For comparison, a tool with the same shape was made and used with the same composite sintered body treated with rice. Cutting test conditions are cutting speed 601 minutes depth of cut 0.15ff1
The cutting was carried out at a feed rate of 002 m and a feed rate of π/revolution while applying a water-soluble cutting agent.
ネ発明の焼結体では工具逃げ面摩耗中が０．４朋に介す
るまでに５０分間切削できたが、比較焼結体では１０分
で同−摩耗中に達した。The sintered body of the invention could be cut for 50 minutes until the tool flank wear reached 0.4 mm, but the comparative sintered body reached the same level of wear after 10 minutes.
実施例２
実施例１と同様にして直径８ｍｍ、ダイヤモンド焼結体
層１ｍｍ、超硬合金基材２．５門の本発明焼結体を４ケ
用いて直径４６ｍｍのコアビットを製作した。比較のた
めダイヤモンド焼結体のみからなる直径８πＩｎ厚さ２
ｍｍのもので全体を王水中で加熱処理して結合金属Ｃ
Ｏ相の大部分を焼結体の全体から除去したものを作成し
、同−形状のコアピットを製作した。２つのビットで一
軸圧縮強度１．６５０”鴇の安山岩の堀割テストを行な
った。回転数２００回／分で同一ビット給圧でテストし
たところ本発明焼結体を用いたビットでは掘進速度１０
ｍ／分で２０π掘削可能であった。一方比較焼結体を用
いたビットでは掘削初期に全ての焼結体が欠損した。Example 2 A core bit with a diameter of 46 mm was manufactured in the same manner as in Example 1 using four sintered bodies of the present invention each having a diameter of 8 mm, a diamond sintered body layer of 1 mm, and a cemented carbide base material of 2.5 pieces. For comparison, a diamond sintered body with a diameter of 8πIn and a thickness of 2
mm, and the whole is heat-treated in aqua regia to form a bonded metal C.
A sintered body was prepared by removing most of the O phase from the entire sintered body, and a core pit of the same shape was manufactured. A drilling test was carried out on andesite with an unconfined compressive strength of 1.65" using two bits. When the test was conducted at the rotation speed of 200 rpm and the same bit supply pressure, the bit using the sintered body of the present invention had a drilling speed of 10.
It was possible to excavate 20π at m/min. On the other hand, with the bit using the comparative sintered compact, all of the sintered compact was broken at the early stage of drilling.
【図面の簡単な説明】
第１図は典型的な従来のダイヤモンド複合焼結体の斜視
図である。１はダイヤモンド焼結体部２は超硬合金基材
である。第２図は本発明焼結体の断面図である。１．２
は第１図と同じ、１′はダイヤモンド焼結体部から鉄族
金属結合相の大部分が除去された領域である。
５
ア１圀
手続補正書
昭和５８年７月２７日
１、事件の光示
昭和５８年特許願 第’？＋６’？１ 号２、発明の
名称
ダイヤモンド焼結体及びその処理方法
３、補正をする者
事件との関係 特許出願人
住所 大阪市東区北浜５丁目１５番地名称（２１
３）住方電気工業ｆ１３式会社社長 用上哲部
４、代理人
住所 大阪市此花区島屋１丁目１番３号住友電気
工業株式会社内
６、補正の対象
明細書中、発明の詳細な説明の欄
Ｚ 補正の内容
（１） 明細書中、発明の詳細な説明の欄を下記の通
。
り補正する。
（イ） 同書第２頁４行目「従来技術とその問題点」を
「（ロ） 従来技術とその問題点」に補正する。
（ロ） 同書第４頁８行目「位温」を「低温」に補正す
る。
（ハ） 同書第５頁５行目「（ロ）発明の構成」を「（
ハ）発明の構成」に補正する。
に） 同書第５頁１１行目「勾酸」を「勾配」に補正す
る。
（… 同書第７頁６行目「（ハ）発明の効果」を「に）
発明の効果」に補正する。
（ハ） 同書第８頁最下行ｒ １．６５ Ｊをｒ １．
６５ ｊに補正する。
（ト） 同書第９頁５行目「掘進」を「掘進」に補正
する。
（イ）同書第９頁４行目「掘削」を「掘削」に補正する
。
（Ｉ刀 同書第９頁５行目「掘削」を「掘削」に補正す
る。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a typical conventional diamond composite sintered body. 1, the diamond sintered body part 2 is a cemented carbide base material. FIG. 2 is a sectional view of the sintered body of the present invention. 1.2
is the same as in FIG. 1, and 1' is a region where most of the iron group metal binder phase has been removed from the diamond sintered body. 5 A1. Written amendment of country procedure dated July 27, 1982 1. Lighting up of the case 1989 Patent Application No.'? +6'? 1 No. 2, Name of the invention Diamond sintered body and its processing method 3, Relationship with the case of the person making the amendment Patent applicant address Name (21), 5-15 Kitahama, Higashi-ku, Osaka
3) Sumikata Electric Industries Co., Ltd. F13 Type Company President Tetsube 4, Agent address 6, Sumitomo Electric Industries Co., Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka City, Detailed explanation of the invention in the specification subject to amendment Column Z Contents of amendment (1) In the specification, the column for detailed explanation of the invention should be changed as follows. Correct. (b) On page 2, line 4 of the same book, ``Prior art and its problems'' is amended to ``(b) Prior art and its problems.'' (b) On page 4, line 8 of the same book, "potential temperature" is corrected to "low temperature." (c) On page 5, line 5 of the same book, “(b) Structure of the invention” was changed to “(
C) Amendment to "Composition of the invention". ) In the same book, page 5, line 11, ``magic acid'' is corrected to ``gradient.'' (…Page 7, line 6 of the same book, “(c) Effect of the invention”)
The amendment shall be made to ``effect of the invention''. (c) Same book, page 8, bottom line r 1.65 J to r 1.
Correct to 65 j. (g) In the 5th line of page 9 of the same book, "digging" is amended to "digging". (b) On page 9, line 4 of the same book, "excavation" is amended to "excavation." (Ito, page 9, line 5 of the same book, "excavation" is corrected to "excavation".
Claims (2)
ンド焼結体の層が超硬合金からなる基材に超高圧焼結時
に接合されてなる複合焼結体において、ダイヤモンド焼
結体層の表面から少くとも０．２Ｍπの表層部が予め含
有されていた鉄族金属結合相の大部分を溶解除去したも
のであることを特徴とするダイヤモンド焼結体。(1) In a composite sintered body in which a layer of a diamond sintered body made of diamond and an iron group metal bonding phase is bonded to a base material made of cemented carbide during ultra-high pressure sintering, from the surface of the diamond sintered body layer A diamond sintered body characterized in that the surface layer portion of at least 0.2Mπ is obtained by dissolving and removing most of the iron group metal binder phase previously contained.
属結合相からなるダイヤモンド焼結体の層が超硬合金基
材に接合されてなる複合ダイヤモンド焼結体のダイヤモ
ンド焼結体層のみを鉄族金属を溶解する酸または電解液
に浸し、ダイヤモンド焼結体の表層部の鉄族金属結合相
を溶解除去することを特徴とするダイヤモンド焼結体の
処理方法。(2) Only the diamond sintered body layer of a composite diamond sintered body is formed by bonding a layer of diamond sintered body made of diamond and an iron group metal bonding phase under ultra-high pressure to a cemented carbide base material. A method for treating a diamond sintered body, which comprises immersing the diamond sintered body in an acid or an electrolytic solution that dissolves the iron group metal to dissolve and remove the iron group metal binder phase in the surface layer of the diamond sintered body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9169183A JPS59219500A (en) | 1983-05-24 | 1983-05-24 | Diamond sintered body and treatment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9169183A JPS59219500A (en) | 1983-05-24 | 1983-05-24 | Diamond sintered body and treatment thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59219500A true JPS59219500A (en) | 1984-12-10 |
Family
ID=14033527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9169183A Pending JPS59219500A (en) | 1983-05-24 | 1983-05-24 | Diamond sintered body and treatment thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59219500A (en) |
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