JPWO2012160956A1 - 医療用具用複合材料およびその製造方法 - Google Patents
医療用具用複合材料およびその製造方法 Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 45
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 43
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 41
- 239000011159 matrix material Substances 0.000 claims abstract description 23
- 229910045601 alloy Inorganic materials 0.000 claims description 61
- 239000000956 alloy Substances 0.000 claims description 61
- 239000002245 particle Substances 0.000 claims description 43
- 239000000843 powder Substances 0.000 claims description 43
- 229910010380 TiNi Inorganic materials 0.000 claims description 38
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 37
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229910020203 CeO Inorganic materials 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 235000012438 extruded product Nutrition 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 210000004204 blood vessel Anatomy 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- -1 copper-zinc-aluminum Chemical compound 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003073 embolic effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000001727 in vivo Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910001000 nickel titanium Inorganic materials 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001192 hot extrusion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910017518 Cu Zn Inorganic materials 0.000 description 1
- 229910017535 Cu-Al-Ni Inorganic materials 0.000 description 1
- 229910017752 Cu-Zn Inorganic materials 0.000 description 1
- 229910017773 Cu-Zn-Al Inorganic materials 0.000 description 1
- 229910017943 Cu—Zn Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910018643 Mn—Si Inorganic materials 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910011214 Ti—Mo Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
a)溶解法によって超弾性形状記憶合金からなるインゴットを作製する工程。
b)上記超弾性形状記憶合金インゴットを粉砕または切削して超弾性形状記憶合金粉末にする工程。
c)上記超弾性形状記憶合金粉末と金属酸化物の粒子とを混合する工程。
d)上記超弾性形状記憶合金粉末と上記金属酸化物粒子との混合物を焼結して押出加工する工程。
溶解法によってTiNi系合金からなるインゴットを作製する。他の方法として、Ti粉末とNi粉末とを混合して焼結させる粉末冶金法によってTiNi系合金焼結体を得ることが考えられる。
TiNi系合金インゴットを粉砕または切削してTiNi系合金粉末を得る。
TiNi系合金粉末にTiO2やAl2O3などの金属酸化物粒子を添加し、金属酸化物粒子が均一に分散するように混合する。TiNi系合金粉末に対する金属酸化物粒子の添加量は、好ましくは、0.10〜1.0容量%である。0.10容量%未満の添加量であれば、最終的に得られる複合材料において、応力−歪み曲線におけるプラトー領域の応力値の向上が不十分である。添加量が1.0容量%を超えると、プラトー領域における応力値は向上するものの、伸びの低下が顕著になってくるので生体内で使用される医療用具としての用途に適さなくなる。特に、血管の屈曲部分に配置されるようなステントの場合、繰り返しの曲げ荷重が作用するので、伸び特性は重要な因子となる。
TiNi系合金粉末と金属酸化物粒子との混合物を焼結して押出加工する。焼結は、真空雰囲気もしくは不活性ガス雰囲気で行うことが好ましく、真空雰囲気で行うことがより好ましい。焼結温度は特に限定するものではないが、例えば、700〜1200℃が好ましく、800〜1100℃がより好ましい。また、押出加工は、熱間押出加工が好ましい。
下記の混合物を準備した。
試料1:TiNi系合金粉末(比較例)
試料2:TiNi系合金粉末に0.5容量%(0.33wt%)のTiO2粒子を添加(本発明例)
試料3:TiNi系合金粉末に1.0容量%(0.66wt%)のTiO2粒子を添加(本発明例)
試料4:TiNi系合金粉末に0.2容量%のAl2O3粒子を添加(本発明例)
試料5:TiNi系合金粉末に1.0容量%のAl2O3粒子を添加(本発明例)
試料6:TiNi系合金粉末に0.15容量%(0.10wt%)のTiO2粒子を添加(本発明例)
試料7:TiNi系合金粉末に0.38容量%(0.25wt%)のTiO2粒子を添加(本発明例)
上記の各試料を下記の条件で焼結して焼結体を得た。
温度:900℃
保持時間:30分
雰囲気:真空
圧力:40MPa
昇温速度:20℃/分
得られた焼結体に対して、下記の条件で熱間押出加工を行って押出加工品を得た。
予備加熱温度:1050℃
予備加熱時間:10分
押出比:6
押出ラム速度:6mm/秒
試料1〜7の押出加工品について、室温環境にて、下記の条件で引張試験を行なった(N=2)。
試験片の形状:丸棒
試験片の直径:3.5mm
試験片の長さ:20mm
引張速度:歪速度5×10−4s−1
試料2、試料3、試料6および試料7の押出加工品を引張ることにより一定の歪みを加えた後、応力を除荷する引張試験を1サイクルとして、加える歪みを変えて3サイクル行うヒステリシス試験を下記の条件で行なった。試料2に対する歪み量は、サイクル1で3%、サイクル2で7%、サイクル3で15%とした。試料3に対する歪み量は、サイクル1で3%、サイクル2で5%、サイクル3で10%とした。試料6および試料7に対する歪み量は、サイクル1で4%、サイクル2で10%、サイクル3で15%とした。
試験片の形状:丸棒
試験片の直径:3.5mm
試験片の長さ:20mm
引張速度:歪み速度5×10−4s−1
Claims (7)
- マトリックスを構成する超弾性形状記憶合金と、
前記マトリックス中に分散した金属酸化物とを備える、医療用具用複合材料。 - 当該医療用具用複合材料は、前記超弾性形状記憶合金の粉末と前記金属酸化物の粒子とを混合後に焼結して押出加工することによって得られたものである、請求項1に記載の医療用具用複合材料。
- 前記超弾性形状記憶合金粉末に対する前記金属酸化物粒子の添加量は、0.10〜1.0容量%である、請求項2に記載の医療用具用複合材料。
- 前記超弾性形状記憶合金粉末は、TiNi系合金粉末、Cu系合金粉末、Fe系合金粉末およびTi系合金粉末からなる群から選ばれた一つの合金粉末であり、
前記金属酸化物粒子は、TiO2、Al2O3、CeO2、MgO、CaO、およびZrO2からなる群から選ばれた一つの酸化物粒子である、請求項3に記載の医療用具用複合材料。 - 前記超弾性形状記憶合金粉末はTiNi系合金粉末であり、
前記金属酸化物粒子およびその添加量は、0.10〜1.0容量%のTiO2および0.1〜1.0容量%のAl2O3のうちのいずれか一方である、請求項4に記載の医療用具用複合材料。 - 溶解法によって超弾性形状記憶合金からなるインゴットを作製する工程と、
前記超弾性形状記憶合金インゴットを粉砕または切削して超弾性形状記憶合金粉末にする工程と、
前記超弾性形状記憶合金粉末と金属酸化物の粒子とを混合する工程と、
前記超弾性形状記憶合金粉末と前記金属酸化物粒子との混合物を焼結して押出加工する工程とを備える、医療用具用複合材料の製造方法。 - 前記超弾性形状記憶合金はTiNi系合金であり、
前記金属酸化物およびその添加量は、0.10〜1.0容量%のTiO2および0.1〜1.0容量%のAl2O3のうちのいずれか一方である、請求項6に記載の医療用具用複合材料の製造方法。
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