Hitachi, Ltd.

Hitachi Metals, Ltd.

Junji Sakai

Mitsuo Nakagawa

Hitoshi Okoshi

Syogo Morimoto

Yoshiyuki Yasutomi

Takahiko Ookouchi

Tetsuo Nakazawa

Masahisa Sobue

Yoshitaka Nakayama

Tamihito Kawahigashi

Osamu Shitamura

Takahiko Okouchi

Tomohito Oyagi

Tadahiko Miyoshi

Yasutsugu Yoshimura

Yoshio Takakura

Yukio Saito

Akio Chiba

Takashi Shimaguchi

Masatoshi Seki

Hironori Shimogama

Seiji Okazaki

Teruo Yamaguchi

Yasunobu Kani

Seiji Watahiki

Takatoshi Tanigawa

Ryoji Takahashi

Minoru Morikawa

Yoshitsugu Maehashi

Mituo Taguchi

Hiroki Numata

Toshio Kamata

Takehisa Kimura

In a molten metal plating apparatus all surfaces of a sinking roller and a supporting roller to be in contact with a molten metal are coated with iron silicide films. A bearing comprises a holder made of a heat resistant steel and lined with a carbon-carbon fiber complex material. A surface of the holder is coated with an Fe,Si film similar to the sinking roller. There is an Fe,Si film on a surface of a shaft portion, and the Fe,Si is in contact with and slides on the carbon-carbon fiber complex material.

Molten metal plating apparatus

An apparatus comprising a plurality of sliding members, at least one of the sliding members being a self-lubricating-function sliding member characterized by containing a precursor compound which produces a solid-lubricating compound during sliding by reacting with an atmosphere in which the sliding member is used or a component of a material with which the sliding member is in sliding contact.

Apparatus having sliding member with precursor material providing solid

A slide structure comprises a roll shaft and a roll bearing. A whole circumference of the roll shaft is made of a sintered ceramics body. A sliding surface of the roll bearing is constructed by inserting a cermet into a carbon-carbon reinforcing graphite member. A continuous hot dipping apparatus has a roll supported and rotated in a molten metal bath. A sliding surface of the roll shaft and the roll bearing employs the slide structure. The corrosion resistivity and the wearing resistivity can be improved and a long service life can be attained. The slide structure comprised of the roll shaft and the roll bearing can be smoothly rotated by decreasing the friction coefficient of the slide structure.

Slide structure and continuous hot dipping apparatus having slide

A sliding bearing to be immersed in molten metal has low friction and long life. The bearing is provided with a solid particle trap portion for preventing solid particles in the molten metal from penetrating between sliding surfaces of the shaft and the bearing and removing the solid particles. Abrasive wear and an increase in friction, caused by biting of the solid particles into the sliding surfaces can be prevented. A continuous hot-dip plating apparatus employs the sliding bearing in the molten metal.

Molten metal immersion sliding bearing and continuous hot-dip plating

A continuous hot dipping apparatus which comprises a slide bearing structure of a bearing and a roll shaft which is of a combination of a ceramic material and a solid lubricant material, and which has good wear resistance and long term durability. A heat resistant steel is provided, which is used in a molten metal of hot dipping and which essentially consists of 0.15-0.30% C, not more than 20% Si, not more than 2% Mn, 20-30% Cr, 10-20% Ni and not less than 50% Fe.

Continuous hot dipping apparatus and slide bearing structure therefor

A casting method for manufacturing various types of ceramics products having an intricate configuration and a partly diversified wall thickness, such as compressor scroll blade and a screw rotor, by casting a slurry including ceramics, etc. in a mold, includes an arrangement wherein the mold is partly or entirely formed of a flexible gel material which can be melted by heating at a temperature lower than the boiling point of the dispersion medium, whereby the stresses generated when molding the product can be mitigated. Thus, the molding of a product having a high level of dimensional accuracy can be carried out with ease.

Slip casting method

The present invention is a composite ceramic structure having a porosity of 5 to 40% by volume comprising particles selected from the group consisting of grains and whiskers of at least one inorganic compound AB, where B is oxygen, nitrogen or carbon and A is any metal so the difference in electronegativity between A and B is less than 1.7; or particles selected from the group consisting of grains and whiskers of an inorganic compound, where there is a difference of 1.7 and higher between the components, and having layers of the inorganic compound AB formed on the surfaces of the particles. The particles are bonded together by silicon nitride particles having an average particle size of less than 0.2 micron. The composite ceramic structure is produced by sintering a shape composed of particles of AB or composed of particles having layers of AB formed on the surfaces of the particles in a gaseous atmosphere containing silicon and nitrogen to grow silicon nitride particles on the surfaces of the shaped inorganic particles.

High strength composite ceramic structure and process for producing the

A continuous hot-dip plating apparatus has a roll assembly having superior resistance to erosion caused by the hot melt plating metal, as well as high resistance to wear of the shaft and bearings, which are immersed in the hot melt of the plating metal. A ceramic material is mounted on the sliding portions of the metallic roll shaft to make sliding contact with the metallic bearings and/or on the sliding surfaces of the metallic bearings which contact the metallic roll shaft. A clearance is left between the shafts and bearings to hold molten metal thereinbetween for lubrication.

Continuous hot-dip plating apparatus

A mold for casting particularly a core, is produced by mixing refractory particles with colloidal alumina to give a slurry, filling said slurry in a pattern having water absorption properties, solidifying the slurry, followed by drying and firing. The resulting mold, particularly core, has high dimensional accuracy with no cracks.

Process for producing core for casting

In a mold to be hardened by a CO.sub.2 gas, a mold binder material comprising a combination of polymers containing carboxyl groups, at least one of multi-valent metal oxides and multi-valent metal hydroxides, and resins of polyvinyl alcohol group, and at least one of sodium salt of gluconic acid and polyhydric alcohols or a mold binder material comprising a combination of polymers having carboxyl groups, at least one of multi-valent metal oxides and multi-valent metal hydroxides, and at least one of sodium salt of gluconic acid and polyhydric alcohols is provided. By use of the present binder material, the following various effects can be obtained: (1) easy preparation of mold sand, (2) easy removal of the binder material by water washing even if bodies or clothes are fouled by the binder material, (3) a longer working time of mold sands, (4) a higher mold strength, (5) an improved working atmosphere at shaping of the mold, (6) an improved production efficiency of molds, (7) the desired mold strength being obtained with a smaller amount of CO.sub.2 gas used, etc.

Mold binder material

A mold with an increased compression strength and a good collapsibility is prepared with a good efficiency by mixing refractory particles with a binder material comprising a caustic alkali-neutralized product of a copolymer containing a carboxyl group and calcium hydroxide, thereby preparing molding materials, filling the molding materials around a pattern, and blowing CO.sub.2 gas into the mold sand, thereby hardening the molding materials. Polyvinyl alcohol, calcium oxide, at least one hydroxide of zinc, aluminum, barium, magnesium, and iron, SBR latex, etc. can be added to the binder material, when desired.

Process for preparing mold

Particulate material for forming molds produced by mixing particulate refractory material with one material selected from the group consisting of colloidal silica, colloidal alumina, colloidal zirconia and ethyl silicate, drying the mixture and allowing same to set, and crushing the dried mixture into particulate form again. The particulate material includes refractory particles provided with a coat of silica or alumina or zirconia on the surface and increases the strength and surface precision of a mold.

Growing community of inventors

Ibaraki, Japan

Junji Sakai