Hitachi Chemical Company, Ltd.

Kiyoshi Kawai

Hiroki Mikuni

Katsunori Kodato

Kazuyuki Akasaka

The aluminum silicate of the invention has: an element ratio of Si and Al, represented by Si/Al, of from 0.3 to 1.0 by molar ratio; a peak at approximately 3 ppm in aAl-NMR spectrum; peak A at approximately &#x2212;78 ppm and peak B at approximately &#x2212;85 ppm in aSi-NMR spectrum; and a peak at approximately 2&#x3b8;=26.9&#xb0; and a peak at approximately 2&#x3b8;=40.3&#xb0; in a powder X-ray diffraction spectrum. The aluminum silicate has an area ratio of peak B with respect to peak A of from 2.0 to 9.0, or does not include a tubular substance having a length of 50 nm or more as observed in a transmission electron microscope (TEM) photograph of the aluminum silicate taken at a magnification of 100,000. The aluminum silicate is produced by a method comprising: subjecting a reaction product of a silicate ion solution and an aluminum ion solution to desalting and solid separation; subjecting a resultant to a thermal treatment in an aqueous medium in the presence of an acid under concentration conditions in an aqueous medium such that a silicon atom concentration is 100 mmol/L or more and an aluminum atom concentration is 100 mmol/L or more; and subjecting a resultant to further desalting and solid separation.

Aluminum silicate, metal ion adsorbent, and method for producing same

It is an object of the invention to provide a ceramic sintered body that has a dense structure and minimal cracking and that exhibits excellent sliding properties even in a non-lubricated state, as well as a process for its production and sliding parts that employ the same. According to a preferred mode, the sintered body of the invention comprises silicon carbide as the parent material and further contains a solid lubricant A with a mean particle size of no greater than 5 &#x3bc;m and a solid lubricant B with a mean particle size of 10-70 &#x3bc;m.

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Hitachinaka, Japan

Kiyoshi Kawai