JPH01219101A - Iron powder for powder metallurgy and production thereof - Google Patents
Iron powder for powder metallurgy and production thereofInfo
- Publication number
- JPH01219101A JPH01219101A JP63043934A JP4393488A JPH01219101A JP H01219101 A JPH01219101 A JP H01219101A JP 63043934 A JP63043934 A JP 63043934A JP 4393488 A JP4393488 A JP 4393488A JP H01219101 A JPH01219101 A JP H01219101A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- lubricant
- iron powder
- alloying element
- iron
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000314 lubricant Substances 0.000 claims abstract description 36
- 238000005275 alloying Methods 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 18
- 238000005204 segregation Methods 0.000 abstract description 12
- 239000000203 mixture Substances 0.000 abstract description 9
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 abstract description 5
- 229910002804 graphite Inorganic materials 0.000 abstract description 3
- 239000010439 graphite Substances 0.000 abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- HGPXWXLYXNVULB-UHFFFAOYSA-M lithium stearate Chemical compound [Li+].CCCCCCCCCCCCCCCCCC([O-])=O HGPXWXLYXNVULB-UHFFFAOYSA-M 0.000 abstract description 2
- 239000011651 chromium Substances 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- UQLDLKMNUJERMK-UHFFFAOYSA-L di(octadecanoyloxy)lead Chemical compound [Pb+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O UQLDLKMNUJERMK-UHFFFAOYSA-L 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［ａ梁上の利用分野］
本発明は取扱い時に成分偏析を生ずることがない、従っ
て均質な焼結製品を得ることのできる粉末冶金用鉄粉と
その製造方法に関するものである。[Detailed description of the invention] [Field of application on a beam] The present invention relates to an iron powder for powder metallurgy that does not cause component segregation during handling and can therefore produce a homogeneous sintered product, and a method for producing the same. It is.
［従来の技術］
原料鉄粉を焼結して金属製品を製造する際には、合金化
元素を加えて物性の改善を図ることがある。たとえば強
度や硬さを高めるための炭素粉はその一例であり、その
他加圧成形時の摩擦抵抗を減少させる目的で潤滑剤を配
合添加している。[Prior Art] When manufacturing metal products by sintering raw iron powder, alloying elements are sometimes added to improve physical properties. For example, carbon powder is used to increase strength and hardness, and lubricants are added to reduce frictional resistance during pressure molding.
このように主原料鉄粉及びその他の添加物粉粒体を配合
して焼結晶を製造する場合、配合物中における各成分の
均一分散は極めて重要であり、特に合金化元素の偏析は
焼結製品の寸法精度の低下を招いたり、硬さや強度およ
びその他特性のばらつきとなって現われるので、成分偏
析のない均一な混合原料が望まれている。ところが合金
化元素や潤滑剤は比重や粒度等が主原料鉄粉と異なるた
め、均一混合することは難しく、たとえ均一混合したも
のでもその後の取扱い時の振動や流動等によって分離・
偏析する傾向にある。When producing sintered crystals by blending the main raw material iron powder and other additive powders in this way, uniform dispersion of each component in the blend is extremely important. A uniform mixed raw material free from component segregation is desired, as this may lead to a decrease in the dimensional accuracy of the product or to variations in hardness, strength, and other properties. However, since alloying elements and lubricants differ in specific gravity and particle size from the main raw material iron powder, it is difficult to mix them uniformly, and even if they are mixed uniformly, they may separate or separate due to vibrations and flow during subsequent handling.
They tend to segregate.
またこれらの配合物を金型に充填する際、比重の低い潤
滑剤や合金化元素成分の分離飛散がおこり作業環境の面
からも大きな問題となっていｌご。Furthermore, when filling molds with these compounds, lubricants with low specific gravity and alloying element components separate and scatter, which poses a major problem in terms of the working environment.
［発明が解決しようとする課題］
上記状況に鑑み本発明においては合金化元素が主原料鉄
粉中に均一に配合されており、また取扱い時に偏析を生
ずることがない様な粉末冶金用鉄粉とその製造方法につ
いて検討した。[Problems to be Solved by the Invention] In view of the above circumstances, the present invention provides an iron powder for powder metallurgy in which alloying elements are uniformly blended into the main raw material iron powder and which does not cause segregation during handling. and its manufacturing method.
［課題を解決するための手段］
上記課題を解決することのできた本発明の粉末冶金用鉄
粉とは、潤滑剤０．３〜１．３％（重量％の意味、以下
同じ）、合金化元素粉０．１〜１０％および残部鉄粉よ
りなり、鉄粉表面に合金化元素粉が固着しているもので
あり、該合金化元素粉が固着した鉄粉は潤滑剤ＯＪ〜１
．３％９合金化元素粉０．１〜１０％および残部鉄粉を
混合する工程および少なくとも潤滑剤の融点以上の温度
に加熱する工程を実施することにより得ることができる
。[Means for Solving the Problems] The iron powder for powder metallurgy of the present invention that can solve the above problems includes a lubricant of 0.3 to 1.3% (meaning % by weight, the same applies hereinafter), alloying It is composed of 0.1 to 10% elemental powder and the balance iron powder, and the alloying element powder is adhered to the surface of the iron powder.The iron powder to which the alloying element powder is adhered is lubricant OJ~1.
．． It can be obtained by performing a step of mixing 0.1 to 10% of 3%9 alloying element powder and the balance iron powder, and a step of heating to a temperature at least equal to or higher than the melting point of the lubricant.
［作用コ
本発明においては潤滑剤０．３〜１．３％９合金化元素
粉０．１〜１０％および残部鉄粉を混合し、且つ少なく
とも潤滑剤の融点以上の温度に加熱するが、それによっ
て潤滑剤が溶融し、潤滑剤が鉄粉に融着すると共にそれ
が接着剤として作用し、合金化元素粉が鉄粉に付着し固
定される。尚混合工程と加熱工程は混合後加熱、加熱後
混合並びに加熱・混合同時進行等任意の手順で実施する
ことができる。加熱後混合する場合は鉄粉のみ、あるい
は鉄粉と潤滑剤の混合体、または鉄粉と合金化元素粉の
混合体を加熱してから残りの成分を徐々に添加しつつ混
合するのが良く、加熱・混合同時進行は混合を開始しつ
つ徐々に温度を高めていくのが良い。[Function] In the present invention, lubricant 0.3-1.3% 9 alloying element powder 0.1-10% and the balance iron powder are mixed and heated to a temperature at least equal to or higher than the melting point of the lubricant, As a result, the lubricant is melted, and the lubricant is fused to the iron powder and acts as an adhesive, so that the alloying element powder is attached and fixed to the iron powder. The mixing step and the heating step can be carried out in any desired manner, such as heating after mixing, mixing after heating, or simultaneous heating and mixing. When mixing after heating, it is best to heat only the iron powder, or a mixture of iron powder and lubricant, or a mixture of iron powder and alloying element powder, and then gradually add and mix the remaining ingredients. When heating and mixing are performed simultaneously, it is preferable to gradually increase the temperature while starting the mixing.
潤滑剤の配合量が０．３％未満では潤滑剤が加熱溶融し
ても鉄粉表面を完全にカバーできないため合金化元素粉
の固定が不完全となるとともに潤滑効果が少なく金型か
らの抜き圧が大きくなる（第５図参照）。また１、３％
を超えても付着度および抜き圧の向上効果が飽和に達す
ると共に潤滑剤含有の過多に基く加工時密度の低下をき
たす（第４図参照）。したがって潤滑剤配合量は０．３
〜１．３％とする。潤滑剤としてはステアリン酸亜鉛、
ステアリン酸リチウム、ステアリン酸鉛、ステアリン酸
カルシウム、ステアリン酸マグネシウム等粉末冶金用の
潤滑剤として通常用いられるものを用いることができる
。If the amount of lubricant is less than 0.3%, even if the lubricant is heated and melted, it will not completely cover the surface of the iron powder, resulting in incomplete fixation of the alloying element powder, and the lubricating effect will be low, making it difficult to remove from the mold. The pressure increases (see Figure 5). Also 1.3%
Even if this value is exceeded, the effect of improving adhesion and evacuation pressure reaches saturation, and at the same time, the density during processing decreases due to excessive lubricant content (see FIG. 4). Therefore, the lubricant content is 0.3
~1.3%. Zinc stearate as a lubricant,
Lubricants commonly used as lubricants for powder metallurgy, such as lithium stearate, lead stearate, calcium stearate, and magnesium stearate, can be used.
合金化元素粉としては、黒鉛粉を初めとするＣの他に、
Ｎｉ、Ｃｒ、Ｍｏ、Ｖ、Ｗ、Ｃｏ。As alloying element powders, in addition to C including graphite powder,
Ni, Cr, Mo, V, W, Co.
Ｃｕ、Ｂ、Ｔｉおよびその他の合金化元素粉を挙げるこ
とができ、これらのうち１種以上を配合して目的の特性
を有する製品を得る。合金化元素粉の配合量は目的とす
る製品の特性および前記潤滑剤の配合量によっても多少
異なるが０．１〜１０％とする。０．１％未満では配合
効果がなく、１０％を超えて配合した場合潤滑剤による
付着率が低下し偏析防止の効果が低くなる。特に炭素鋼
を製造する際にはＣ源として黒鉛粉０．２〜１．５％配
合するのが好ましい。また合金化元素粉の粒径は鉄粉へ
付着させるという観点から２０μｍ以下とするのが好ま
しい。Cu, B, Ti and other alloying element powders may be mentioned, and one or more of these may be blended to obtain a product with desired properties. The blending amount of the alloying element powder varies somewhat depending on the characteristics of the intended product and the blending amount of the lubricant, but it is set at 0.1 to 10%. If it is less than 0.1%, there is no blending effect, and if it is blended in excess of 10%, the adhesion rate by the lubricant will decrease and the effect of preventing segregation will be reduced. In particular, when manufacturing carbon steel, it is preferable to mix 0.2 to 1.5% of graphite powder as a C source. Further, the particle size of the alloying element powder is preferably 20 μm or less from the viewpoint of adhesion to the iron powder.
加熱温度については、合金化元素粉および潤滑剤が鉄粉
表面に固着する温度、すなわち少な（とも潤滑剤が溶融
する温度以上に加熱する必要があり、潤滑剤が溶融する
ことによって両者が鉄粉表面に固着する。加熱温度が高
すぎると溶融潤滑剤の粘度が低下し過ぎて鉄粉の孔の内
部まで浸透してしまうため、鉄粉表面に存在してこそ発
揮される伺滑性が損われ摩擦が増加して抜き圧の増加や
圧粉体密度の低下となって現われる。但しその上限を一
律に定めることは実情に沿わず、たとえば潤滑剤として
ステアリン酸亜鉛を用いる場合には加熱温度はステアリ
ン酸亜鉛の融点（１４０℃）以上、融点＋３０℃（１７
０℃）以下の温度範囲に加熱するのが好ましい（第１図
および第２図参照）。Regarding the heating temperature, it is necessary to heat the alloying element powder and the lubricant to the temperature at which they stick to the surface of the iron powder, that is, the temperature at which the lubricant melts. It sticks to the surface. If the heating temperature is too high, the viscosity of the molten lubricant decreases too much and it penetrates into the pores of the iron powder, impairing the lubricity that can only be achieved when it exists on the surface of the iron powder. The cracking friction increases, resulting in an increase in the ejection pressure and a decrease in the density of the green compact.However, it is not practical to set a uniform upper limit for this.For example, when zinc stearate is used as a lubricant, the heating temperature is higher than the melting point of zinc stearate (140℃), melting point +30℃ (17℃)
It is preferable to heat to a temperature range below 0° C. (see FIGS. 1 and 2).
上記のように鉄粉表面に合金化元素粉および潤滑剤を固
着させた均一分散原料を用いると、ホッパー投入時や金
型充填時等における振動や流動等によって成分偏析が生
ずることがない。したがって均質な焼結製品を得ること
ができる。また当然なろくら合金化元素粉や潤滑剤が鉄
粉に固着しているので前記のような取扱い時における分
離飛散等の環境問題を生ずることはない。When a uniformly dispersed raw material with alloying element powder and lubricant fixed to the surface of the iron powder is used as described above, component segregation will not occur due to vibrations, flow, etc. during charging into a hopper or filling a mold. Therefore, a homogeneous sintered product can be obtained. Furthermore, since the alloying element powder and lubricant are fixed to the iron powder, environmental problems such as separation and scattering during handling as described above will not occur.
［実施例］
（１）ステアリン酸亜鉛（以下Ｚｎ−３ｔと記す）６．
０ｇ、黒鉛粉３．０ ｇおよびアトマイズ鉄粉２９７ｇ
を■型混合器で３０分間混合したものを１１０〜１９０
℃（Ｚｎ−Ｓｔの融点−３０℃〜融点＋５０℃）の温度
範囲の中から夫々設定された温度に加熱し、同温度で１
５分間保持して黒鉛粉およびＺｎ−３ｔを鉄粉表面に固
着させ、冷却後未着の黒鉛粉およびＺｎ−３ｔを風力分
離した。黒鉛粉およびＺｎ−３ｔの鉄粉への付着量（黒
鉛とＺｎ−５ｔの配合量に対する％）と加熱温度との関
係を第１図に示す。また同図に加熱温度と圧縮成形（５
ｔ／ａｍ”）後の抜き圧の関係を示す。また第２図に加
熱温度と圧粉体密度（ｇ／ｃｍ３）の関係を示す。[Example] (1) Zinc stearate (hereinafter referred to as Zn-3t)6.
0g, graphite powder 3.0g and atomized iron powder 297g
110-190 after mixing for 30 minutes with a ■ type mixer.
℃ (melting point of Zn-St -30℃ to melting point +50℃).
The graphite powder and Zn-3t were held for 5 minutes to adhere to the surface of the iron powder, and after cooling, the unattached graphite powder and Zn-3t were separated by air. FIG. 1 shows the relationship between the amount of graphite powder and Zn-3t attached to the iron powder (% of the blended amount of graphite and Zn-5t) and the heating temperature. The figure also shows the heating temperature and compression molding (5
Fig. 2 shows the relationship between the heating temperature and the green compact density (g/cm3).
第１図および第２図から明らかなように少なくともＺｎ
−３ｔの融点以上に加熱すれば付着量が良好となること
がわかる。また加熱温度が高すぎると抜き圧が高くなる
とともに圧粉体密度も低下するので加熱温度が高すぎる
ことは良くない。即ち加熱温度はＺｎ−３ｔの融点以上
融点＋３０℃以下、好ましくは融点＋１０℃以上融点＋
２０℃以下が良いことがわかる。As is clear from FIGS. 1 and 2, at least Zn
It can be seen that the amount of adhesion becomes good when heated above the melting point of -3t. Furthermore, if the heating temperature is too high, the ejection pressure will increase and the green compact density will also decrease, so it is not good that the heating temperature is too high. That is, the heating temperature is above the melting point of Zn-3t and below the melting point +30°C, preferably above the melting point +10°C and below the melting point +
It can be seen that 20°C or lower is good.
（２）次にＺｎ−３ｔの配合量を変えて前記（１）と同
様にして黒鉛粉およびＺｎ−３ｔ付着鉄粉を得た。第３
図に黒鉛粉およびＺｎ−３ｔの付着量とＺｎ−３ｔ配合
量の関係を、第４図に圧粉体密度とＺｎ−３ｔ配合量の
関係を、第５図に抜き圧とＺｎ−３ｔ配合量の関係をそ
れぞれ示す。(2) Next, graphite powder and Zn-3t-adhered iron powder were obtained in the same manner as in (1) above by changing the blending amount of Zn-3t. Third
Figure 4 shows the relationship between the adhesion amount of graphite powder and Zn-3t and the Zn-3t content, Figure 4 shows the relationship between the green compact density and the Zn-3t content, and Figure 5 shows the relationship between the extraction pressure and the Zn-3t content. The relationship between quantities is shown.
第３図、第４図および第５図から明らかなようにＺｎ−
５ｔの配合量が多いほど付着量は高くなり、抜き圧は低
くなるが、圧粉体密度が低下するのでＺｎ−３ｔ配合量
は０．３〜１．３％にするのが良い。As is clear from FIGS. 3, 4 and 5, Zn-
The larger the amount of Zn-3t mixed, the higher the adhesion amount and the lower the extraction pressure, but the density of the green compact decreases, so the amount of Zn-3t mixed is preferably 0.3 to 1.3%.
（３） Ｚ ｎ −Ｓ ｔ ８ ｇ 、黒鉛粉１０ｇお
よびアトマイズ鉄粉９９０ｇを■型混合器で３０分間混
合した後１６０℃に加熱し同温度で１５分間保持し、冷
却して本発明の粉末冶金用鉄粉を製造した。得られた粉
末冶金用鉄粉を成形圧Ｓｔ／ｃｍ２．焼結温度１１５０
℃（Ａｘガス中）で加圧成形して焼結体を得た。また比
較のために同配合で混合のみのものを製造し、これを同
条件で加圧成形して焼結体を得た。第６図に焼結体の硬
さとそのばらつきを示す。第６図から明らかなように比
較例に比べ本発明例による硬さのばらつきは％以下と小
さく、最初と最後のばらつきも小さくなっている。これ
は黒鉛粉の偏析が少なくなったためである。(3) 8 g of Z n -S t , 10 g of graphite powder, and 990 g of atomized iron powder were mixed in a ■-type mixer for 30 minutes, then heated to 160°C, held at the same temperature for 15 minutes, and cooled to obtain the powder of the present invention. Manufactured iron powder for metallurgy. The obtained iron powder for powder metallurgy was subjected to a compacting pressure St/cm2. Sintering temperature 1150
A sintered body was obtained by pressure molding at °C (in Ax gas). For comparison, a product with the same composition and only mixing was manufactured, and this was pressure-molded under the same conditions to obtain a sintered body. Figure 6 shows the hardness of the sintered body and its variation. As is clear from FIG. 6, the variation in hardness according to the example of the present invention is smaller than that of the comparative example, at less than %, and the variation between the beginning and the end is also small. This is due to less segregation of graphite powder.
（４）２〜８％Ｎ ｉ 、 ０．５〜５％Ｃｕ、０．３
〜３％ＭＯ９１％Ｚｎ−５ｔ、０．５％Ｇｒ、残部アト
マイズ鉄粉（１０００ｇ）を■型混合器で３０分間混合
後、１６０℃に加熱し同温度で１５分間保持し冷却した
時の合金化元素粉の添加量と付着率の関係を第７図に示
す。図から明らかな様に合金化元素粉の添加量が１０％
以上になると、潤滑剤による合金化元素粉の付着率が低
くなるため偏析防止の効果が薄くなる。(4) 2-8% Ni, 0.5-5% Cu, 0.3
~3%MO91%Zn-5t, 0.5%Gr, balance atomized iron powder (1000g) was mixed in a type mixer for 30 minutes, heated to 160℃, kept at the same temperature for 15 minutes, and cooled. FIG. 7 shows the relationship between the amount of chemical element powder added and the adhesion rate. As is clear from the figure, the amount of alloying element powder added is 10%.
If it exceeds the above range, the rate of adhesion of the alloying element powder by the lubricant becomes low, and the effect of preventing segregation becomes weak.
（５）添加合金化元素粉の偏析低下を確認するため、２
％Ｎ ｉ 、 ０．５％Ｍｏ、０．５％Ｇｒ（黒鉛）、
１％Ｚｎ−３ｔ、残部アトマイズ鉄粉を配合し、■型混
合器で３０分間混合後、１６０ｔに加熱し同温度に１５
分間保持後、成形圧５ｔ／ｃｍ２．Ａｘガス雰囲気中１
１５０℃で１０φ×５５”（ｃｍ）に焼結した。得られ
た焼結体の引張試験結果を第１表に示す。また比較のた
めＺｎ−５ｔを添加しないものを同様に加圧成形して焼
結体を得た。結果を第１表に併記する。(5) To confirm the reduction in segregation of the added alloying element powder, 2
%N i , 0.5%Mo, 0.5%Gr (graphite),
Blend 1% Zn-3t and the balance with atomized iron powder, mix for 30 minutes in a type mixer, heat to 160t, and keep at the same temperature for 15 minutes.
After holding for a minute, the molding pressure was 5t/cm2. In Ax gas atmosphere 1
It was sintered to a size of 10φ x 55" (cm) at 150°C. The tensile test results of the obtained sintered body are shown in Table 1. For comparison, a piece without Zn-5t was similarly pressure-formed. A sintered body was obtained.The results are also listed in Table 1.
本発明例は合金化元素粉の偏析が少なく、ばらつきも％
以下となっており、強度の弱い部分が減少するため全体
の強度は高くなっている。In the example of the present invention, there is less segregation of alloying element powder, and the variation is also %.
The overall strength is increased because the weaker parts are reduced.
［発明の効果コ
本発明は以上のように構成されているので本発明方法に
よって製造した本発明粉末冶金用鉄粉は取扱い時に成分
偏析をおこさず、これを用いると均質な焼結晶を得るこ
とができる。また作業環境の改善を図ることができる。[Effects of the invention] Since the present invention is constructed as described above, the iron powder for powder metallurgy of the present invention produced by the method of the present invention does not cause component segregation during handling, and when used, homogeneous sintered crystals can be obtained. Can be done. It is also possible to improve the working environment.
第１図は鉄粉への黒鉛粉およびＺｎ−３ｔの付着度と加
熱温度、抜き圧と加熱温度の関係を示す図、第２図は圧
粉体密度および加熱温度の関係を示す図、第３図は鉄粉
への黒鉛粉およびＺｎ−５ｔの付着度とＺｎ−３ｔ配合
量の関係を示す図、第４図は圧粉体密度とＺｎ−３ｔ配
合量の関係を示す図、第５図は抜き圧とＺｎ−３ｔ配合
量の関係を示す図、第６図は焼結体の硬さとそのばらつ
きを示す図、第７図は合金化元素粉添加量と付着率を示
す図である。
黒鉛粉およびＺｎ−５ｔ付着度（％］
；
−日ン寸
圧粉体密／ｌ（ｇ／ＣＦ１１”） （ａｔ ５ｔ／ｚ
２）黒鉛粉およびＺ ｎ−３ｔ ｆ、ｔ’ ７？？ ／
ｘ （％）０ ０ ＣＣＣ０
第５図
Ｚｎ−５ｔ配合量（う）
；硼隈 昧）Figure 1 is a diagram showing the relationship between the degree of adhesion of graphite powder and Zn-3t to iron powder and heating temperature, and the extraction pressure and heating temperature. Figure 2 is a diagram showing the relationship between green compact density and heating temperature. Figure 3 is a diagram showing the relationship between the degree of adhesion of graphite powder and Zn-5t to iron powder and the amount of Zn-3t mixed, Figure 4 is a diagram showing the relationship between the green compact density and the amount of Zn-3t mixed, and Figure 5 The figure shows the relationship between extraction pressure and Zn-3t content, Figure 6 shows the hardness of the sintered body and its variation, and Figure 7 shows the amount of alloying element powder added and the adhesion rate. . Graphite powder and Zn-5t adhesion degree (%); -day compact powder density/l (g/CF11”) (at 5t/z
2) Graphite powder and Z n-3t f, t' 7? ? /
x (%) 0 0 CCC0 Figure 5 Zn-5t blending amount (u) ; Kankuma Mei)
Claims (2)
じ）、合金化元素粉０．１〜１０％および残部鉄粉より
なり、鉄粉表面に合金化元素粉が固着していることを特
徴とする粉末冶金用鉄粉。(1) Consisting of 0.3 to 1.3% lubricant (meaning of weight %, the same applies hereinafter), 0.1 to 10% alloying element powder, and the balance iron powder, and the alloying element powder adheres to the surface of the iron powder. Iron powder for powder metallurgy.
１０％および鉄粉８８．７〜９９．６％を均一に混合す
る工程及び少なくとも、潤滑剤の融点以上の温度に加熱
する工程を含むことを特徴とする粉末冶金用鉄粉の製造
方法。(2) Lubricant 0.3~1.3%, alloying element powder 0.1~
A method for producing iron powder for powder metallurgy, comprising the steps of uniformly mixing 10% and 88.7 to 99.6% of iron powder, and heating to at least a temperature equal to or higher than the melting point of a lubricant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63043934A JPH01219101A (en) | 1988-02-25 | 1988-02-25 | Iron powder for powder metallurgy and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63043934A JPH01219101A (en) | 1988-02-25 | 1988-02-25 | Iron powder for powder metallurgy and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01219101A true JPH01219101A (en) | 1989-09-01 |
Family
ID=12677521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63043934A Pending JPH01219101A (en) | 1988-02-25 | 1988-02-25 | Iron powder for powder metallurgy and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01219101A (en) |
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