Neyagawa, Japan
Neyagawa, Japan

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Kotani M.,Japan Aerospace Exploration Agency | Matsuzaki S.,Taisei Kogyo Co. | Tanaka S.,Taisei Kogyo Co.
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan | Year: 2011

A simple method for making a porous SiC body through a polymeric route at one firing processing was demonstrated by the sacrificial filler template approach. By incorporating sacrificial pore-forming plastic powder, PMMA microbeads, into liquid preceramic polymer, AHPCS, and losing it after the polymer was hardened, a preceramic porous body was formed. As a consequence of systematic examination of the effects of particle size and mixture ratio of the powder, an AHPCS-derived porous SiC body was reproducibly formed without critical crack initiation. It was enabled only when the polymer was sufficiently contained to make a strong skeletal structure with the sacrificial plastic particles closely distributed. The porous microstructure would contribute to efficient gas emission and uniform thermal shrinkage during polymer pyrolysis, which reduced internal pressure and crack-causing thermal stress. © 2011 The Ceramic Society of Japan.


Manonukul A.,National Metal and Materials Technology Center | Srikudvien P.,National Metal and Materials Technology Center | Tange M.,Taisei Kogyo Co.
Materials Science and Engineering A | Year: 2016

The most common sacrificial material for producing metal foam using the replica impregnation method is polyurethane foam (PU) since it is readily available with different cell sizes. This work studied the microstructure and mechanical properties of commercially pure titanium with varied cell sizes. Titanium foams were fabricated using PU foam with four different cell sizes as templates. The results show that as the number of pores per inch (ppi) increased, the apparent density increased, i.e. the cell size decreased, the porosity decreased and the load bearing capacity increased nonlinearly. This work agreed with the scaling law of Gibson and Ashby for determination of the limit stress. However, the Gibson and Ashby model significantly over-predicted the value for quasi-elastic modulus. © 2015 Elsevier B.V.


Okubo K.,Taisei Kogyo Co. | Tanaka S.,Taisei Kogyo Co. | Ito H.,Yamagata University
Microsystem Technologies | Year: 2010

This study aims to develop processing techniques to improve dimensional accuracy of micro-size parts produced by micro metal injection molding (μ-MIM). Micro dumbbell specimens were molded by a micro injection molding machine, which can monitor the cavity pressure in injection molding process. The effects of particle size and distribution of metal powder on dimensional accuracy of micro dumbbell specimens at both grip parts were investigated. As the results, it is confirmed that the powder properties and sintering conditions to improve the dimensional accuracy of micro-MIM parts. © 2010 Springer-Verlag.


Hu X.,University of Tsukuba | Cheng D.,Taisei Kogyo Co. | Zhang Z.,University of Tsukuba
Pharmaceutical Biology | Year: 2016

Context The root of Helicteres angustifolia L. (Sterculiaceae) has been used as folk herbal drug to treat cancer, bacterial infections, inflammatory, and flu in China. However, there is no report on its antidiabetic activity. Objective This study evaluates the antidiabetic activity of ethanol extract from H. angustifolia root. Materials and methods The promoting effect of H. angustifolia root ethanol extract (25, 50, and 100 μg/mL) on glucose uptake was evaluated using HepG2 cell, differentiated C2C12 myotubes, and differentiated 3T3-L1 adipocytes. The antidiabetic activity of the extract was assessed in vivo using STZ-induced diabetic rats by orally administration of the extract (200 and 400 mg/kg b.w.) once per day for 28 d. Blood glucose, TG, TC, TP, HDL-C, UA, BUN, AST, ALT, insulin, and HOMA-IR were analyzed. Results The results showed that the extract increased glucose uptake in C2C12 myotubes and 3T3-L1 adipocytes with an IC50 value of 79.95 and 135.96 μg/mL, respectively. And about 12%, 19%, and 10% (p < 0.05) in HepG2 cells when compared with the control at the concentration of 25, 50, and 100 μg/mL, respectively. After 28 days’ treatment with the extract, significant reduction was observed in blood glucose, HOMA-IR, TC, TG, UA, BUN, AST, and ALT levels, while the levels of TP and HDL cholesterol increased. Discussion and conclusion These results suggest that H. angustifolia root ethanol extract possess potent antidiabetic activity, which is the first report on antidiabetic activity of this plant. © 2016 Taylor & Francis


Patent
Taisei Kogyo Co. | Date: 2014-11-05

[Object] The present invention provides a porous sintered body which has a uniform porosity, a high level of freedom in forming, allowing to be formed into varieties of shapes and various levels of porosity, and to be formed to an extremely high level of porosity. [Means for Solution] There is provided a porous sintered body 1 which is obtained by sintering a powder 4, and includes hollow cores 5 following a vanished shape of an interlaced or otherwise structured fibriform vanisher material 2; sintered walls 6 obtained by sintering the powder held around the cores and extending longitudinally of the cores; and voids 7 between the sintered walls.


Patent
Taisei Kogyo Co. | Date: 2014-03-05

[Object] There is provided a porous sintered body has a uniform porosity, a high level of freedom in body formation which allows formation into varieties shapes and various levels of porosity, and a very large surface area. [Solution] The porous sintered body includes: hollow cores which follow a vanished shape of an interlaced or otherwise structured fibriform vanisher material; sintered walls 226 which extend longitudinally of the cores and obtained by sintering a first sintering powder held around the cores; and voids formed between the sintered walls. The cores and the voids communicate with each other via absent regions formed in the sintered walls. The sintered walls have surfaces formed with a sintered microparticulate layer 232 made from a material containing a second sintering powder which has a smaller diamater than the first sintering powder, and has predetermined pores 231.


A thermal formation sintering compound containing a binder, a sinterable powder material and a pore formation material, for formation into a predetermined shape in a thermal formation step, removal of the binder in a degreasing step, and sintering of the powder material in a sintering step is provided. The binder contains a low-temperature draining component which melts in the thermal formation step, begins draining at a temperature lower than a draining temperature of the pore formation material, and drains at a temperature lower than a temperature at which the pore formation material drains; and a high-temperature draining component which melts in the thermal formation step, begins draining after the pore formation material begins draining, and drains at a temperature higher than does the pore formation material.


[Object] There is provided a porous sintered body has a uniform porosity, a high level of freedom in body formation which allows formation into varieties shapes and various levels of porosity, and a very large surface area. [Solution] The porous sintered body includes: hollow cores which follow a vanished shape of an interlaced or otherwise structured fibriform vanisher material; sintered walls 226 which extend longitudinally of the cores and obtained by sintering a first sintering powder held around the cores; and voids formed between the sintered walls. The cores and the voids communicate with each other via absent regions formed in the sintered walls. The sintered walls have surfaces formed with a sintered microparticulate layer 232 made from a material containing a second sintering powder which has a smaller diamater than the first sintering powder, and has predetermined pores 231.


Patent
Taisei Kogyo Co. | Date: 2012-12-28

[Object] The present invention provides a porous sintered body which has a uniform porosity, a high level of freedom in forming, allowing to be formed into varieties of shapes and various levels of porosity, and to be formed to an extremely high level of porosity. [Means for Solution] There is provided a porous sintered body 1 which is obtained by sintering a powder 4, and includes hollow cores 5 following a vanished shape of an interlaced or otherwise structured fibriform vanisher material 2; sintered walls 6 obtained by sintering the powder held around the cores and extending longitudinally of the cores; and voids 7 between the sintered walls.


PubMed | University of Tsukuba and Taisei Kogyo Co.
Type: Journal Article | Journal: Pharmaceutical biology | Year: 2016

Context The root of Helicteres angustifolia L. (Sterculiaceae) has been used as folk herbal drug to treat cancer, bacterial infections, inflammatory, and flu in China. However, there is no report on its antidiabetic activity. Objective This study evaluates the antidiabetic activity of ethanol extract from H. angustifolia root. Materials and methods The promoting effect of H. angustifolia root ethanol extract (25, 50, and 100 g/mL) on glucose uptake was evaluated using HepG2 cell, differentiated C2C12 myotubes, and differentiated 3T3-L1 adipocytes. The antidiabetic activity of the extract was assessed in vivo using STZ-induced diabetic rats by orally administration of the extract (200 and 400mg/kg b.w.) once per day for 28 d. Blood glucose, TG, TC, TP, HDL-C, UA, BUN, AST, ALT, insulin, and HOMA-IR were analyzed. Results The results showed that the extract increased glucose uptake in C2C12 myotubes and 3T3-L1 adipocytes with an IC50 value of 79.95 and 135.96 g/mL, respectively. And about 12%, 19%, and 10% (p < 0.05) in HepG2 cells when compared with the control at the concentration of 25, 50, and 100 g/mL, respectively. After 28 days treatment with the extract, significant reduction was observed in blood glucose, HOMA-IR, TC, TG, UA, BUN, AST, and ALT levels, while the levels of TP and HDL cholesterol increased. Discussion and conclusion These results suggest that H. angustifolia root ethanol extract possess potent antidiabetic activity, which is the first report on antidiabetic activity of this plant.

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