巻号一覧
61 巻, 7 号
July
選択された号の論文の8件中1～8を表示しています
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特集：硬質材料の組織，特性，製造等の研究成果と新たな展開
総報
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松原 秀彰2014 年 61 巻 7 号 p. 348-
発行日: 2014/07/15
公開日: 2014/08/25
ジャーナル オープンアクセスPDF形式でダウンロード (100K)
受賞記念講演
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角谷 均2014 年 61 巻 7 号 p. 349-354
発行日: 2014/07/15
公開日: 2014/08/25
ジャーナル オープンアクセスABSTRACT
Novel ultra-hard materials: single-phase (binderless) polycrystalline diamond and cBN, have been produced by direct conversion sintering under static high pressure and high temperature. The polycrystalline diamond and cBN consist of fine grains of several tens or hundreds nano-meters without containing any secondary phases or binder materials. They have high hardness and high strength which surpass those of their single crystals and conventional sintered compacts containing binder materials. The fine microstructure features without any secondary phases and surpassing mechanical properties of the single-phase polycrystalline diamond and cBN are promising for applications in next-generation high-precision and high-efficiency cutting tools.抄録全体を表示PDF形式でダウンロード (1180K)
研究論文
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細川 裕之, 加藤 清隆, 下島 康嗣, 古嶋 亮一, 松本 章宏2014 年 61 巻 7 号 p. 355-361
発行日: 2014/07/15
公開日: 2014/08/25
ジャーナル オープンアクセスABSTRACT
The microstructures of Ti(C0.7N0.3)–19Mo2C-xNbC–24Ni cermets (x = 0, 5, 10, 15, 20) were studied. The microstructures of them consisted of hard phase with Ti(C, N) and solid soluted Ti(C, N), and Ni binder phase. The solid soluted Ti(C,N) surrounded Ti(C, N), namely, core-rim structures in the cermets with low NbC contents. The phase separation between Ti(CN) core and solid soluted Ti(C, N) occurs in the cermets with high NbC contents. As a result of TEM analysis, solid soluted Ti(C, N) nucleated surrouunding Ti(C, N) in the 5NbC, on the other hand, another site in the 20NbC. The content of Nb in solid soluted Ti(C, N) in the 20NbC was higher than that in 5NbC. The hard phase separation occurred when the lattice constant of solid soluted Ti(C, N) was beyond 4.328 Å.抄録全体を表示PDF形式でダウンロード (1386K) -
田中 公美子, 西山 勝廣2014 年 61 巻 7 号 p. 362-368
発行日: 2014/07/15
公開日: 2014/08/25
ジャーナル オープンアクセスABSTRACT
An experimental study for obtaining a high performance ceramics of titanium diboride and tungsten carbide composites (TBWC) are described. WC content 10 to 90 volume percent tungsten was examined. The TBWC is inexpensive and can be fabricated by a hotpress-sintering process. The TBWC with density 95 % and above of the theoretical value were obtained using constituent powder of micron size by hotpress sintering. The TBWC thus obtained consists of four phases which are (Ti, W)B2, (W, Ti)C and 2 types of (W, Ti)B. Unlike porycrystalline diamond and cBN compacts, in which the intrinsic hardness or strength of the constituents is utilized, it seems that the TBWC is basically hardened or strengthend by solution hardening or dispersion strengthening mechanisms. Those mechanisms were confirmed by metallography, X-ray diffraction, electron probe microanalysis and mechanical tests.抄録全体を表示PDF形式でダウンロード (1374K) -
平林 洋太郎, 竹内 慎二, 日比野 敦2014 年 61 巻 7 号 p. 369-377
発行日: 2014/07/15
公開日: 2014/08/25
ジャーナル オープンアクセスABSTRACT
TiAl base and Ni3Al base composite intermetallic compounds were investigated by Two-step combustion synthesis process. In TiAl–Ni3Al composite compound by the combustion synthesis, the products contain Ti2NiAl3 (τ3)and TiNi2Al (τ4) phases, and spoil the mechanical properties of the composite compound material. Therefore, Two-step combustion synthesis of TiAl base and Ni3Al base composite compounds were examined in compositions near the TiAl and Ni3Al of the Ti–Ni–Al system
Elemental (Ti+Al) premixed compact was made to react by thermal explosion reaction as first step combustion synthesis. The synthesized TiAl product was grinded, and mixed with elemental Ti, Ni and Al powders again. The (TiAl+Ti+Ni+Al) mixed compact was made to react by thermal explosion reaction as second step combustion synthesis. For the products obtained, density, phase, microstructure, Vickers hardness, and compression strength were measured.
By using Two-step combustion synthesis, TiAl base and Ni3Al base composite compounds could be fabricated. The TiAl base composite intermetallic compounds were so hard and so weak, to use for mechanical material. However Ni3Al base composite compounds contained a few Ti component exhibited superior ductility. Therefore, it was found that the addition of Ti component into Ni3Al is effective for improving the mechanical properties of Ni3Al compound.抄録全体を表示PDF形式でダウンロード (2013K)
本会記事
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2014 年 61 巻 7 号 p. Pref7_1-
発行日: 2014/07/15
公開日: 2014/08/25
ジャーナル オープンアクセスPDF形式でダウンロード (1286K) -
2014 年 61 巻 7 号 p. Mtg7_2-Mtg7_6
発行日: 2014/07/15
公開日: 2014/08/25
ジャーナル オープンアクセスPDF形式でダウンロード (335K)
訂正
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西田 智, 吉田 眞規, 鈴木 浩則, 竹増 光家, 小出 隆夫2014 年 61 巻 7 号 p. 381-
発行日: 2014/07/15
公開日: 2014/08/25
ジャーナル オープンアクセス訂正
本誌第61巻第 6号に掲載の西田 智氏，吉田 眞規氏，鈴木 浩則氏，竹増 光家氏，小出 隆夫氏の研究論文，「Ni-Mo系低合金鋼粉を適用した焼結転造浸炭歯車の特性」につきまして， p.319に印刷の段階で誤りがございましたので，下記の通り訂正させていただきます.大変ご迷惑をお掛けしましたことをここにお詫び申し上げます.
○p.319左段 4行目~右段 1行目
(正)高強度浸炭焼結材のベースとなる脱 Cr系材のプレアロイ粉は， Ni-Mo系材， Mo系材が一般的に用いられており，これまで弊社で製品化されている低合金鋼粉浸炭材の回転曲げ疲労強度(焼結密度 7.0 g/cm3)とニ円筒面圧疲労強度(焼結密度 7.3 g/cm3)のを Table 1に示す.
(誤)高強度浸炭焼結材のベースとなる脱 Cr系材のプレアロイ粉は， Ni-Mo系材， Mo系材が一般的に用いられており，これまで弊社で製品化されな 「る低合金銅粉浸炭材の回転曲げ疲労強度(焼結密度 7.0 g/cm3)と二円筒面圧疲労強度(焼結密度 7.3 g/cm3)を Table 1に示す.抄録全体を表示PDF形式でダウンロード (362K)
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