Mayekawa Mfg. Co., Ltd.

Nissan Motor Company Limited

Kabushiki Kaisha Riken

Takaaki Ito

Hiroshi Ishida

Akira Iwashita

Pancer Branko

Makoto Abe

Akira Fujiki

Akiyoshi Ishibashi

Kimitsugu Kiso

Kazutoshi Takemura

A particles object freezing device includes an air-permeable belt configured to support conveyance of a particles object, and an injection plate which includes a plurality of injection holes configured to inject a cooling gas for fluidizing the particles object toward the belt from below. The injection plate includes a first injection part and a second injection part which are disposed along a width direction of the belt, and are different in opening ratio. A first boundary between the first injection part and the second injection part is along a traveling direction of the belt.

Particles object freezing device

A particulate material freezing device includes a belt and an injection plate. The belt is configured to support conveyance of a particulate material and has air permeability. The injection plate includes a plurality of injection holes configured to inject a cooling gas to the belt from below. Further, the belt includes a sliding portion configured to move while sliding on an upper surface of the injection plate in a traveling direction of the belt. Thus, the particulate material freezing device is implemented where a flow of the cooling gas is stabilized.

A material for valve seats comprising a wear resisting sintered ferro alloy formed by dispersing particles of a high speed steel in a matrix in which hard alloy particles are dispersed. Steps for forming include mixing particles of a matrix material, carbide material and a hard alloy, and blending the mixture with high speed steel particles, pressurizing and compacting the mixture after blending, then sintering them at 1000.degree. to 1200.degree. C. In the preferred method, at least one element of Fe, C, Ni, Co, Si or Mn is included as the matrix material, and at least one element of Fe, Cr, Mo or V as the carbide material and at least one element of Fe, Cr, Mo, Co, C or W as the hard alloy are prepared. Furthermore, the ferro alloy preferably includes the following amounts of the above mentioned elements, 0.5 to 2.0 wt % of C, 1 to 25 wt % of one or more of Cr, Mo, V, or W and 1 to 15 wt % of one or more of Co, Ni, Mn, or Si.

Hard alloy particle dispersion type wear resisting sintered ferro alloy

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Tokyo, Japan

Takaaki Ito