JP2021031690A - Method for manufacturing 999 platinum alloy having high hardness and high compressive strength - Google Patents
Method for manufacturing 999 platinum alloy having high hardness and high compressive strength Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910001260 Pt alloy Inorganic materials 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 18
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 230000000704 physical effect Effects 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 8
- 229910052697 platinum Inorganic materials 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000013632 homeostatic process Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000006679 Mentha X verticillata Nutrition 0.000 description 2
- 235000002899 Mentha suaveolens Nutrition 0.000 description 2
- 235000001636 Mentha x rotundifolia Nutrition 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000007542 hardness measurement Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、９９９（３ナイン、又はスリーナイン）の純度を有するにもかかわらず、高硬度と高圧縮強度を有する白金合金、及びその製造方法に関するものである。
ここで３ナインとは、（イ）品位検定独立法人造幣局の基準値９９．９％、（ロ）独立行政法人 造幣局ホールマーク Ｐｔ９９９、又は（ハ）リング・ペンダント・ピアスなど貴金属製品品位の単位を表記している１００分率 ９９９／１０００、等をいう。
The present invention relates to a platinum alloy having a high hardness and a high compressive strength despite having a purity of 999 (3 nines or three nines), and a method for producing the same.
Here, 3 nines are (a) the standard value of the Japan Mint, a quality test, 99.9%, (b) the Hallmark Pt999 of the Japan Mint, or (c) the unit of quality of precious metal products such as rings, pendants, and earrings. It refers to the indicated 100% rate 999/1000, etc.
白金（Ｐｔ）は、資産価値の高い貴金属として、また高級宝飾品（身飾品）の材料として、極めて重要かつ高価な元素（物質）である。
従来、白金の加工品を製作するには、その加工特性等を改良するために、一部に他の金属を配合して溶解・鋳造することが行われている。
Platinum (Pt) is an extremely important and expensive element (substance) as a precious metal with high asset value and as a material for high-class jewelry (jewelry).
Conventionally, in order to produce a processed platinum product, in order to improve its processing characteristics and the like, other metals are partially mixed and melted / cast.
ところが、白金の有する高級感（金属色、光沢、重量感）や資産価値を考慮して、純度の高い白金の加工品（宝飾品、身飾品）の製作を試みても、その硬度や強度が不足し、加工が困難である。
すなわち、３ナインの純度を維持する白金のビッカーズ硬度は、高々８５Ｈｖ程度しかないため、実用品たる宝飾品や身飾品として加工しても、加工が困難であるばかりでなく、その機能や変形を防止（恒常性を維持）することができなかった。
However, considering the high-class feeling (metal color, luster, weight feeling) and asset value of platinum, even if you try to manufacture high-purity processed platinum products (jewelry, jewelry), the hardness and strength will be high. It is insufficient and difficult to process.
That is, since the Vickers hardness of platinum that maintains the purity of 3 nines is only about 85 Hv at most, even if it is processed as a practical jewelry or jewelry, it is not only difficult to process, but also its function and deformation. It could not be prevented (maintained homeostasis).
発明者は以前、純度９９．９９重量％以上の純度を有する白金に、極めて微量のＧａを配合して鋳造し、又はこれをＮ２ガス雰囲気下で鋳造することにより、３ナインを維持しつつ、白金合金のビッカーズ硬度を９０Ｈｖ以上に上げることに成功した（特許文献１）。
本発明は、更に研究を重ね、微量元素としてＳｉ、Ｂを使用して、白金の純度、３ナインを保持しつつビッカーズ硬度、及び変形圧縮強度を上げた白金合金の製造方法である。
The inventor has previously cast a very small amount of Ga in platinum having a purity of 99.99% by weight or more, or cast it in an N2 gas atmosphere while maintaining 3 nines. We succeeded in raising the Vickers hardness of the platinum alloy to 90 Hv or more (Patent Document 1).
The present invention is a method for producing a platinum alloy in which Si and B are used as trace elements to increase the Vickers hardness and the deformation compression strength while maintaining the purity of platinum and 3 nines.
本願発明は、下記の請求項１〜請求項６により構成されている。
＜請求項１＞
９９．９９重量％以上の純度を有するＰｔと、微小量のＳｉ又は／及びＢを溶解炉に入れて鋳造することを特徴とする下記（Ａ）及び（Ｂ）の物性を有する白金合金の製造方法。
（Ａ）Ｐｔが、９９９（スリーナイン）の純度を有すること
（Ｂ）幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍの平打ちリングのビッカーズ硬度が９５Ｈｖ以上であること
＜請求項２＞
９９．９９重量％以上の純度を有するＰｔと、微小量のＳｉ又は／及びＢを溶解炉に入れて鋳造することを特徴とする下記（Ａ）及び（Ｂ）の物性を有する白金合金の製造方法。
（Ａ）Ｐｔが、９９９（スリーナイン）の純度を有すること
（Ｂ）幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍの平打ちリングの１５％変形圧縮強度が１０ｋｇｆ以上であること
＜請求項３＞
９９．９９重量％以上の純度を有するＰｔと、微小量のＳｉ又は／及びＢを溶解炉に入れて鋳造することを特徴とする下記（Ａ）、（Ｂ）、及び（Ｃ）の物性を有する白金合金の製造方法。
（Ａ）Ｐｔが、９９９（スリーナイン）の純度を有すること
（Ｂ）幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍの平打ちリングのビッカーズ硬度が９５Ｈｖ以上であること
（Ｃ）幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍの平打ちリングの１５％変形圧縮強度が１０ｋｇｆ以上であること
＜請求項４＞
鋳造を真空状態で行う請求項１〜請求項３のいずれかに記載する白金合金の製造方法。
＜請求項５＞
真空状態が、８００ヘクトパスカル以下である請求項４に記載する白金合金の製造方法。
＜請求項６＞
請求項１〜請求項５のいずれかの製造方法で得られる白金合金を使用する身飾品、又は宝飾品の製造方法。
The present invention comprises the following claims 1 to 6.
<Claim 1>
Production of platinum alloy having the following physical characteristics (A) and (B), which comprises casting Pt having a purity of 99.99% by weight or more and a minute amount of Si or / and B in a melting furnace. Method.
(A) Pt has a purity of 999 (three nines) (B) The Vickers hardness of a flat ring having a width of 2.00 mm, a thickness of 1.50 mm, and an inner diameter of 15.9 mm is 95 Hv or more <Claim 2>.
Production of platinum alloy having the following physical characteristics (A) and (B), which comprises casting Pt having a purity of 99.99% by weight or more and a minute amount of Si or / and B in a melting furnace. Method.
(A) Pt has a purity of 999 (three nines) (B) A flat ring having a width of 2.00 mm, a thickness of 1.50 mm, and an inner diameter of 15.9 mm has a 15% deformation compression strength of 10 kgf or more. Item 3>
The following physical properties (A), (B), and (C), which are characterized in that Pt having a purity of 99.99% by weight or more and a minute amount of Si or / and B are placed in a melting furnace and cast. A method for producing a platinum alloy.
(A) Pt has a purity of 999 (three nines) (B) The Vickers hardness of a flat ring having a width of 2.00 mm, a thickness of 1.50 mm, and an inner diameter of 15.9 mm is 95 Hv or more (C) Width 2 The 15% deformation compression strength of a flat ring having a thickness of .00 mm, a thickness of 1.50 mm and an inner diameter of 15.9 mm is 10 kgf or more <Claim 4>.
The method for producing a platinum alloy according to any one of claims 1 to 3, wherein the casting is performed in a vacuum state.
<Claim 5>
The method for producing a platinum alloy according to claim 4, wherein the vacuum state is 800 hectopascals or less.
<Claim 6>
A method for producing jewelry or jewelry using a platinum alloy obtained by the production method according to any one of claims 1 to 5.
本願発明を以上のように構成する理由は、下記のとおりである。
（ａ）従来、単なる地金以外に、公的にスリーナインが保証されたＰｔの実用品（身飾品、宝飾品等）は、その加工性、機能性、恒常性（変形の防止等）を付加（維持）することが困難なため、ほとんど存在しない。
（ｂ）Ｐｔは、純品にＰｔ以外の元素（割り金）を配合して鋳造することによって、その加工性、機能性、恒常性（変形防止等）を付与することができるが、純度９９９を維持するためには、配合する不純物の総量を、最大で０．１重量部以下に抑える必要がある。
したがってＰｔに配合するＰｔ以外の元素（Ｓｉ又は／及びＢ）は、０．１重量％以下に制限される（１００／１００．１＝０．９９９００…）。
（ｃ）９９９の純度を維持し、かつ前記特性を付加するために配合できる不純物（Ｐｔ以外の他の金属）の量は、非常に微量に制限されるので、鋳造方法を工夫し、厳密に管理する必要がある。
（ｄ）請求項３に記載する溶解炉内の圧力を真空（８００ヘクトパスカル以下）に保持するのは、溶解炉内の空気を除去して、Ｏ２ガスの影響を除去するためである。
The reason for configuring the invention of the present application as described above is as follows.
(A) Conventionally, in addition to mere bullion, Pt's practical products (jewelry, jewelry, etc.) whose three nines are officially guaranteed have added workability, functionality, and homeostasis (prevention of deformation, etc.). Almost nonexistent because it is difficult to (maintain).
(B) Pt can be imparted with workability, functionality, and homeostasis (deformation prevention, etc.) by blending a pure product with an element (split) other than Pt and casting, but the purity is 999. It is necessary to keep the total amount of impurities to be blended to 0.1 part by weight or less at the maximum.
Therefore, the elements other than Pt (Si or / and B) to be blended in Pt are limited to 0.1% by weight or less (100 / 100.1 = 0.99900 ...).
(C) Since the amount of impurities (metals other than Pt) that can be blended to maintain the purity of 999 and add the above-mentioned properties is limited to a very small amount, devise a casting method and strictly. Need to manage.
(D) The pressure in the melting furnace according to claim 3 is maintained in a vacuum (800 hectopascals or less) in order to remove the air in the melting furnace and eliminate the influence of the O2 gas.
本願発明によれば、公的に９９９が保証されたＰｔの実用品（身飾品、宝飾品等）が製作できるので、資産価値を維持したまま製作された実用品を、実生活に利用して楽しむことができるという効果を有する。 According to the invention of the present application, it is possible to manufacture a practical product of Pt (jewelry, jewelry, etc.) whose 999 is officially guaranteed. It has the effect of being enjoyable.
（１）次に示すＰｔ，Ｓｉ,及びＢの各元素を、表１に記載する（Ａ）〜（Ｊ）の配合で、かつ下記（２）の鋳造方法により白金合金の地金を鋳造した。
Ｐｔ：純度９９．９９重量％ 田中貴金属工業（株）
Ｓｉ：（株）平野清左衛門商店
Ｂ ：（株）平野清左衛門商店
（２）鋳造条件
使用鋳造機：ＴＲ式高周波発振器 型式ＮＴＲ−０５０２ＳＨＩ−ｓ 出力５Ｋｗ 周波数５０ＫＨｚ メーカー（株）日電高周波 セラミック坩堝使用
電気炉：（株）安井インターテック
鋳型温度：７８０℃
鋳造温度：１９００℃
鋳型へセットしてから鋳造までの時間：３分
(1) Platinum alloy bullions were cast by using the following elements of Pt, Si, and B in the formulations of (A) to (J) shown in Table 1 and by the casting method of (2) below. ..
Pt: Purity 99.99% by weight Tanaka Kikinzoku Kogyo Co., Ltd.
Si: Hirano Seizaemon Shoten Co., Ltd. B: Hirano Seizaemon Shoten Co., Ltd. (2) Casting conditions Casting machine used: TR type high frequency oscillator Model NTR-0502SHI-s Output 5Kw Frequency 50KHz Manufacturer Nichiden High Frequency Ceramic Crucible Electric furnace: Yasui Intertech Co., Ltd. Mold temperature: 780 ° C
Casting temperature: 1900 ° C
Time from setting in the mold to casting: 3 minutes
（３）平打ちリングの作製
リングの作製において、ツリー形状（鋳型になる形状）、埋没方法、脱漏方法、及び鋳造方法は、下記の条件で行った。
（イ）検体の寸法：幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍ
（ロ）ツリー形状：直径８ｍｍ、高さ２０ｍｍ〜５０ｍｍの円柱に、試験資材４本〜２０本を円柱に対して、垂直より上方向へ角度２５度で配置しツリー形状とした。
（ハ）埋没方法： Ｐｔ用埋没材（吉田キャストＡＬＬ８９）７６．２２％、水道水２２．８６％、専用バインダー０．９２％の比率で、（株）愛工舎製作所の混和器で２分混合したものでツリーを埋没し、（株）安井インターテックの脱泡器で３分空気を抜き、１時間乾燥の為５０度にした（株）カトーの温風ヒーター内で放置した。
（ニ）脱漏焼成方法：電気炉に入れ常温から７８０度まで６時間かけて徐々に温度を上げワックスを抜き焼成した。
（ホ）鋳造方法：ルツボにＰｔ９９９９地金を入れ溶解炉内の圧力を７１０ヘクトパスカル（Ｈｐ）に下げ熔解後、そのままの気圧で固める。
大気圧に戻し、鋳造機の蓋を開け７００℃程度まで冷却。
その湯面の中心に（ルツボ内壁に触れないような位置に）、計量しておいたＳｉ（又は／及びＢ）を置き、鋳型をセットし、溶解炉内の圧力を７１０ヘクトパスカル（Ｈｐ）にして熔解し、一度１９５０℃まで上げ、すぐに加熱をやめ融点まで下げる。
再度加熱し１９００℃で鋳造した。
(3) Preparation of flat ring In the production of the ring, the tree shape (shape to be a mold), the burial method, the leakage method, and the casting method were carried out under the following conditions.
(B) Specimen dimensions: width 2.00 mm, thickness 1.50 mm, inner diameter 15.9 mm
(B) Tree shape: A tree shape was formed by arranging 4 to 20 test materials on a cylinder having a diameter of 8 mm and a height of 20 mm to 50 mm at an angle of 25 degrees upward from the vertical with respect to the cylinder.
(C) Buried method: Pt burial material (Yoshida Cast ALL89) 76.22%, tap water 22.86%, special binder 0.92%, mixed for 2 minutes with a mixer of Aikosha Seisakusho Co., Ltd. The tree was buried in the water, deflated with a defoamer of Yasui Intertech Co., Ltd. for 3 minutes, and left in a warm air heater of Kato Co., Ltd., which was set to 50 degrees for drying for 1 hour.
(D) Leakage firing method: The mixture was placed in an electric furnace and gradually raised in temperature from room temperature to 780 ° C. over 6 hours to remove wax and fired.
(E) Casting method: Pt9999 bullion is put in a crucible, the pressure in the melting furnace is lowered to 710 hectopascals (Hp), and after melting, it is solidified at the same atmospheric pressure.
Return to atmospheric pressure, open the lid of the casting machine, and cool to about 700 ° C.
Place the weighed Si (or / and B) in the center of the molten metal surface (at a position that does not touch the inner wall of the crucible), set the mold, and set the pressure in the melting furnace to 710 hectopascals (Hp). Melt, raise to 1950 ° C, immediately stop heating and lower to melting point.
It was heated again and cast at 1900 ° C.
通常の磨き仕上げ工程を経て平打ちリング（検体Ａ〜Ｊ）を得た。
なお、前記（Ａ）〜（Ｊ）の平打ちリングは、９９９の純度を保持していた。
Flat rings (samples A to J) were obtained through a normal polishing and finishing process.
The flat rings of (A) to (J) maintained a purity of 999.
（４）ビッカーズ硬度の測定
ビッカーズ硬度の測定（微小硬度試験）は、アカシ微小硬度試験器ＭＶＫ−Ｇ３５００ＡＴを用いた（図１）。
ビッカーズ硬度は、平打ちリングにダイアモンドの圧痕を付け（微小硬度測定１）、次に微小硬度距離を測定し、硬度表を参照して数値をだした。
測定はＪＩＳ規格の測定方法に則り、硬度測定を５回行い、その最低数値及び最高数値の２つを切り捨て、中旬値である、３つの数値の平均値を算出した。
表１に測定結果を示す。
(4) Measurement of Vickers hardness The measurement of Vickers hardness (micro-hardness test) was performed using the Akashi micro-hardness tester MVK-G3500AT (FIG. 1).
The Vickers hardness was determined by making diamond indentations on the flat ring (micro hardness measurement 1), then measuring the micro hardness distance, and referring to the hardness table.
The hardness was measured 5 times according to the measurement method of the JIS standard, the minimum value and the maximum value were truncated, and the average value of the three values, which is the middle value, was calculated.
Table 1 shows the measurement results.
（５）１５％変形圧縮強度の測定
変形圧縮強度の測定（微小硬度試験）は、万能試験機オリエンテック ＲＴＣ１３１０を用いた（図２）。
検体は、ビッカーズ硬度の測定と同一の製造方法で作製したもの（（Ａ）〜（Ｊ））を用いた。測定結果を表１に示す。
この測定は、ユーザーが本発明に係る９９９Ｐｔを、身飾品等として身に付けたとき、何キロの圧力に耐えるかを測定しているものである。
(5) Measurement of 15% Deformation Compression Strength The universal tester Orientec RTC1310 was used for the measurement of the deformation compression strength (micro hardness test) (Fig. 2).
As the sample, those prepared by the same production method as the measurement of Vickers hardness ((A) to (J)) were used. The measurement results are shown in Table 1.
This measurement measures how many kilograms of pressure the user can withstand when wearing the 999 Pt according to the present invention as a decorative item or the like.
表１の結果は、ビッカーズ硬度、１５％変形圧縮強度の両者とも、数値が増し、これらの白金合金からは、９９９の純度を維持したまま、実用品を製作できることを示している。 The results in Table 1 show that both the Vickers hardness and the 15% deformation compression strength have increased values, and that practical products can be manufactured from these platinum alloys while maintaining the purity of 999.
本願発明に係る白金合金からは、公的に９９９の純度が保証された白金の実用品（身飾品、宝飾品等）が製作できる。
したがって、資産価値を維持したままの白金を、実生活に利用して楽しむことができ、宝飾（ジュエリー）業界の需要を刺激し、活性化させることができるので十分な産業上の利用可能性がある。
From the platinum alloy according to the present invention, practical platinum products (accessories, jewelry, etc.) whose purity is officially guaranteed to be 999 can be produced.
Therefore, platinum, which maintains its asset value, can be used and enjoyed in real life, and it can stimulate and revitalize the demand of the jewelry industry, so it has sufficient industrial applicability. is there.
Claims (6)
（Ａ）Ｐｔが、９９９（スリーナイン）の純度を有すること
（Ｂ）幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍの平打ちリングのビッカーズ硬度が９５Ｈｖ以上であること Production of platinum alloy having the following physical characteristics (A) and (B), which comprises casting Pt having a purity of 99.99% by weight or more and a minute amount of Si or / and B in a melting furnace. Method.
(A) Pt has a purity of 999 (three nines) (B) The Vickers hardness of a flat ring having a width of 2.00 mm, a thickness of 1.50 mm, and an inner diameter of 15.9 mm is 95 Hv or more.
（Ａ）Ｐｔが、９９９（スリーナイン）の純度を有すること
（Ｂ）幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍの平打ちリングの１５％変形圧縮強度が１０ｋｇｆ以上であること Production of platinum alloy having the following physical characteristics (A) and (B), which comprises casting Pt having a purity of 99.99% by weight or more and a minute amount of Si or / and B in a melting furnace. Method.
(A) Pt has a purity of 999 (three nines) (B) A flat ring having a width of 2.00 mm, a thickness of 1.50 mm, and an inner diameter of 15.9 mm has a 15% deformation compression strength of 10 kgf or more.
（Ａ）Ｐｔが、９９９（スリーナイン）の純度を有すること
（Ｂ）幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍの平打ちリングのビッカーズ硬度が９５Ｈｖ以上であること
（Ｃ）幅２．００ｍｍ、厚み１．５０ｍｍ、内径１５．９ｍｍの平打ちリングの１５％変形圧縮強度が１０ｋｇｆ以上であること The following physical properties (A), (B), and (C), which are characterized in that Pt having a purity of 99.99% by weight or more and a minute amount of Si or / and B are placed in a melting furnace and cast. A method for producing a platinum alloy.
(A) Pt has a purity of 999 (three nines) (B) The Vickers hardness of a flat ring having a width of 2.00 mm, a thickness of 1.50 mm, and an inner diameter of 15.9 mm is 95 Hv or more (C) Width 2 The 15% deformation compression strength of a flat ring with a thickness of .00 mm, a thickness of 1.50 mm and an inner diameter of 15.9 mm shall be 10 kgf or more.
A method for producing jewelry or jewelry using a platinum alloy obtained by the production method according to any one of claims 1 to 5.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07310132A (en) * | 1994-05-13 | 1995-11-28 | Ishifuku Metal Ind Co Ltd | High purity hard platinum material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07310132A (en) * | 1994-05-13 | 1995-11-28 | Ishifuku Metal Ind Co Ltd | High purity hard platinum material |
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