Method of producing fluorapatite and a moisture sensitive resist

Details Method of producing fluorapatite and a moisture sensitive resist Method of producing fluorapatite and a moisture sensitive resist

1989-04-12

1990-11-20

Barr, Josephine

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, 264 67, 252518, 252520, 252521, 338 20, 338 35, 423301, C04B 3334, H01B 106, H01C 304

Patent

active

049717391

ABSTRACT:
A method of producing fluorapatite wherein predetermined amounts of calcium monohydrogen phosphate, calcium carbonate, and calcium fluoride are weighed, subjected to a mechanochemical action, and caused to react with one another in water. With this method, a fluorapatite having a uniform composition can be obtained without the accompaniment of by-products. A moisture sensitive resistor of the present invention can be obtained by sintering the fluorapatite produced in accordance with this method. This moisture sensitive resistor has a sufficiently low resistance corresponding to a humidity, and has substantially no hysteresis.

REFERENCES:
patent: 2553595 (1951-05-01), Maier
patent: 4157378 (1979-06-01), Tomlinson et al.

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