In this paper, some educational programs for graduate studies in Kogakuin University were indicat... more In this paper, some educational programs for graduate studies in Kogakuin University were indicated. Some trials have been mainly conducted in CPD Center of our university , especially for making special programs for MOT and information secure system . Professional school system proposed and started in Japan society has powerful potentials for resolving recent problems generated in traditional graduate school in Japan. However, a lot of tasks may be left behind unsolved , for achieving final goals of professional school system through harmonizing with the role of traditional graduate schools. Furthermore, more investigations concerning how the faculty structure should be and the correlation between graduate program and undergraduate study have to be conducted .
of TiN-coated stainless steel by drying coating process is extremely influenced by the existence ... more of TiN-coated stainless steel by drying coating process is extremely influenced by the existence of various defects in the thin films, such as pinhole defects. Recently, the critical passivation current density (CPCD) method have been frequently used for evaluating the defect ratio (pinhole-ratio) from among various tests employing electrochemical methods. However, CPCD method showed much difficulties when applying to plasma CVD film, because relatively large scale spalling-off of the coated film was recognized after the electrochemical test. In this study, a new method, in which potential and current density changes were measured under coupling condition between specimen and counter electrode of Pt, was proposed for conducting less destructive electrochemical testing. Testing method under coupling condition was less destructive than CPCD method, for causing little peeling off in coated film. Therefore, good correspondence between the defect region in coated film and the penetrated area of it to cause substrate corrosion by electrochemical test was recognized. Also in this coupling test method, the pinhole-ratio Ra of coating can be determined quantitatively from the quantity of electricity Qa through evaluating corrosion pit morphology.
Because of a decrease in the bonding area, the problem in adhesion strength on the joint area is ... more Because of a decrease in the bonding area, the problem in adhesion strength on the joint area is generated. At the same time, misgivings to the breakdown of electronic equipment due to ECM(electro chemical migration) phenomenon has risen along with making more fine pitched wiring on PPA substrate. Infiltration of moisture and existing ion were considered as an accelerating factor of ECM. In this research, the infiltration of moisture and the movement of the metallic ion can be controlled through improving adhesion strength between the PPA substrate and coated resin. Therefore in this paper, the surface treatment of the PPA substrate is conducted for improving adhesion strength with coated resin. For the surface treatment method, the atmospheric pressure plasma processing was employed. These processing can improve adhesion strength through removing an organic contaminant and changing chemical bonding state. In addition, because this processing can be conducted under the atmospheric pressure condition, this method can be built into in-line manufacturing process. The effect of the surface treatments were evaluated by the contact-angle of the surface of polyimide substrate. Then, it was also evaluated by adhesion strength between epoxy resin and PPA substrate. These characteristics were evaluated with passage of time. Moreover, THB test for examining ECM resistance was conducted by using PPA substrate with surface treatments. As a result, adhesion strength was able to be improved, and also expected to improve long life ECM resistance.
Proceedings of the 1992 Annual Meeting of JSME/MMD, 2000
The calcium phosphatC inciuding Hydroxapatite (Calo (PO4) 6(OH) 2 ： referred to as HAp) utilizes ... more The calcium phosphatC inciuding Hydroxapatite (Calo (PO4) 6(OH) 2 ： referred to as HAp) utilizes as a biomateria 里 ， because d皿 t resembles the principa1 ingredient of the tooth ancl bone and have superior biocompatib 孟 1ty ． Threugh coating caicium phosphate on metallic biomaterial such 繍 e c 。 emially p 鵬 ti 圃 ， 山 e biocompatible character can be given to the material together with itS mechanical strength ． Some t直als have been conducted fbr apPlying these coated materia 且 s to the arti行cial bone and so on ． In this stud 刄 he optimum condition of the HAp mms lbrmahon by elec 加 hemical me 山 od was invesUgated by employing QCM ((陬 Crystal Microba 】 ance) ， FE − SEM and EDX Adhesive strεngth of co 飢 ed HAp films was evaluated by the scratch tes し Also ， biocompatible character was examined by immersion test to quasi ・ hurnari boxly fluid ． Keywords；HAp coating ， bioma之 ehai ， bi ompatibHi 以 electr hemical method ， QCM ， FE −SEM ， EDX
Journal of the Society of Materials Science, Japan, 1996
Polyetherimide (PEI) resin has more excellent characteristics in mechanical, thermal, and electri... more Polyetherimide (PEI) resin has more excellent characteristics in mechanical, thermal, and electrical and in crack resistance, in comparison with other engineering plastics. Because of this advantage, PEI resin applications have been extending as a material for use in precise mechanical devices and medical equipment. In these applications, different kinds of cleaning should be implemented. Especially, in the area of medical care, the severe cleaning and disinfection by irradiation is repeatedly provided to medical tools after their use to disinfect them from bacteria. It is, therefore, believed that a systematic appreciation of the degradation behavior of PEI resin under various environmental factors is essential. From these view points, we have tried to identify the degradation behavior under such environmental factors as water absorption, ozone water absorption, ultraviolet (UV) ray irradiation, and the coexistence of water absorption and UV ray irradiation, using analytic methods with chemical devices. We also studied how those degradation behaviors influence fatigue characteristics. As a result, it became clear that strength against fatigue was deteriorated by disintegration of the principal chain structure under the coexistent environment of water absorption and UV ray irradiation.
Journal of the Society of Materials Science, Japan, 1998
Takayoshi YAGASAKI* and Yuji KIMURA* Polyetherimide (PEI) resin has excellent characteristics in ... more Takayoshi YAGASAKI* and Yuji KIMURA* Polyetherimide (PEI) resin has excellent characteristics in mechanical, thermal, and electrical properties, particularly in crack resistance. Thus, its applications are being extended to precision components for electric and electronic devices or medical equipment. In the area of medical care, the repetition of water wash or UV (ultraviolet) ray irradiation on tools must be applied after medical treatment in order to prevent bacterial infection. From these view points, this study was made to evaluate the degradation behavior of PEI resin caused by water absorption and UV ray irradiation. And for the purpose of higher functionalization of PEI resin, the surface coating of titanium (Ti) thin film was tried by vacuum vapor deposition or assisted vapor deposition using the ion beam mixing method. The effect of thin film formation upon water absorption characteristics was examined.
In this paper, some educational programs for graduate studies in Kogakuin University were indicat... more In this paper, some educational programs for graduate studies in Kogakuin University were indicated. Some trials have been mainly conducted in CPD Center of our university , especially for making special programs for MOT and information secure system . Professional school system proposed and started in Japan society has powerful potentials for resolving recent problems generated in traditional graduate school in Japan. However, a lot of tasks may be left behind unsolved , for achieving final goals of professional school system through harmonizing with the role of traditional graduate schools. Furthermore, more investigations concerning how the faculty structure should be and the correlation between graduate program and undergraduate study have to be conducted .
of TiN-coated stainless steel by drying coating process is extremely influenced by the existence ... more of TiN-coated stainless steel by drying coating process is extremely influenced by the existence of various defects in the thin films, such as pinhole defects. Recently, the critical passivation current density (CPCD) method have been frequently used for evaluating the defect ratio (pinhole-ratio) from among various tests employing electrochemical methods. However, CPCD method showed much difficulties when applying to plasma CVD film, because relatively large scale spalling-off of the coated film was recognized after the electrochemical test. In this study, a new method, in which potential and current density changes were measured under coupling condition between specimen and counter electrode of Pt, was proposed for conducting less destructive electrochemical testing. Testing method under coupling condition was less destructive than CPCD method, for causing little peeling off in coated film. Therefore, good correspondence between the defect region in coated film and the penetrated area of it to cause substrate corrosion by electrochemical test was recognized. Also in this coupling test method, the pinhole-ratio Ra of coating can be determined quantitatively from the quantity of electricity Qa through evaluating corrosion pit morphology.
Because of a decrease in the bonding area, the problem in adhesion strength on the joint area is ... more Because of a decrease in the bonding area, the problem in adhesion strength on the joint area is generated. At the same time, misgivings to the breakdown of electronic equipment due to ECM(electro chemical migration) phenomenon has risen along with making more fine pitched wiring on PPA substrate. Infiltration of moisture and existing ion were considered as an accelerating factor of ECM. In this research, the infiltration of moisture and the movement of the metallic ion can be controlled through improving adhesion strength between the PPA substrate and coated resin. Therefore in this paper, the surface treatment of the PPA substrate is conducted for improving adhesion strength with coated resin. For the surface treatment method, the atmospheric pressure plasma processing was employed. These processing can improve adhesion strength through removing an organic contaminant and changing chemical bonding state. In addition, because this processing can be conducted under the atmospheric pressure condition, this method can be built into in-line manufacturing process. The effect of the surface treatments were evaluated by the contact-angle of the surface of polyimide substrate. Then, it was also evaluated by adhesion strength between epoxy resin and PPA substrate. These characteristics were evaluated with passage of time. Moreover, THB test for examining ECM resistance was conducted by using PPA substrate with surface treatments. As a result, adhesion strength was able to be improved, and also expected to improve long life ECM resistance.
Proceedings of the 1992 Annual Meeting of JSME/MMD, 2000
The calcium phosphatC inciuding Hydroxapatite (Calo (PO4) 6(OH) 2 ： referred to as HAp) utilizes ... more The calcium phosphatC inciuding Hydroxapatite (Calo (PO4) 6(OH) 2 ： referred to as HAp) utilizes as a biomateria 里 ， because d皿 t resembles the principa1 ingredient of the tooth ancl bone and have superior biocompatib 孟 1ty ． Threugh coating caicium phosphate on metallic biomaterial such 繍 e c 。 emially p 鵬 ti 圃 ， 山 e biocompatible character can be given to the material together with itS mechanical strength ． Some t直als have been conducted fbr apPlying these coated materia 且 s to the arti行cial bone and so on ． In this stud 刄 he optimum condition of the HAp mms lbrmahon by elec 加 hemical me 山 od was invesUgated by employing QCM ((陬 Crystal Microba 】 ance) ， FE − SEM and EDX Adhesive strεngth of co 飢 ed HAp films was evaluated by the scratch tes し Also ， biocompatible character was examined by immersion test to quasi ・ hurnari boxly fluid ． Keywords；HAp coating ， bioma之 ehai ， bi ompatibHi 以 electr hemical method ， QCM ， FE −SEM ， EDX
Journal of the Society of Materials Science, Japan, 1996
Polyetherimide (PEI) resin has more excellent characteristics in mechanical, thermal, and electri... more Polyetherimide (PEI) resin has more excellent characteristics in mechanical, thermal, and electrical and in crack resistance, in comparison with other engineering plastics. Because of this advantage, PEI resin applications have been extending as a material for use in precise mechanical devices and medical equipment. In these applications, different kinds of cleaning should be implemented. Especially, in the area of medical care, the severe cleaning and disinfection by irradiation is repeatedly provided to medical tools after their use to disinfect them from bacteria. It is, therefore, believed that a systematic appreciation of the degradation behavior of PEI resin under various environmental factors is essential. From these view points, we have tried to identify the degradation behavior under such environmental factors as water absorption, ozone water absorption, ultraviolet (UV) ray irradiation, and the coexistence of water absorption and UV ray irradiation, using analytic methods with chemical devices. We also studied how those degradation behaviors influence fatigue characteristics. As a result, it became clear that strength against fatigue was deteriorated by disintegration of the principal chain structure under the coexistent environment of water absorption and UV ray irradiation.
Journal of the Society of Materials Science, Japan, 1998
Takayoshi YAGASAKI* and Yuji KIMURA* Polyetherimide (PEI) resin has excellent characteristics in ... more Takayoshi YAGASAKI* and Yuji KIMURA* Polyetherimide (PEI) resin has excellent characteristics in mechanical, thermal, and electrical properties, particularly in crack resistance. Thus, its applications are being extended to precision components for electric and electronic devices or medical equipment. In the area of medical care, the repetition of water wash or UV (ultraviolet) ray irradiation on tools must be applied after medical treatment in order to prevent bacterial infection. From these view points, this study was made to evaluate the degradation behavior of PEI resin caused by water absorption and UV ray irradiation. And for the purpose of higher functionalization of PEI resin, the surface coating of titanium (Ti) thin film was tried by vacuum vapor deposition or assisted vapor deposition using the ion beam mixing method. The effect of thin film formation upon water absorption characteristics was examined.
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Papers by Yuji Kimura