Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2885555A
Inventor
Rintaro Takahashi
Takehiko Yuize
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Individual
Original Assignee
Individual
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Publication date
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Priority to GB2885555ApriorityCriticalpatent/GB789700A/en
Publication of GB789700ApublicationCriticalpatent/GB789700A/en
B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
B22F9/00—Making metallic powder or suspensions thereof
Landscapes
Powder Metallurgy
(AREA)
Manufacture Of Metal Powder And Suspensions Thereof
(AREA)
Abstract
Solid or compacted materials are disintegrated by forming within the materials, or impregnating the materials with a substance which substantially increases in volume on taking up water of crystallization and then treating the materials with water to create internal stresses and to cause disintegration of the materials. Examples are given of the treatment of compact and unglazed pottery or concrete by immersion in fused calcium chloride, disintegration being then effected by leaving the material in moist air or in water, of the treatment of hard alloys e.g. of the tungsten carbide-cobalt type with chlorine at 800-850 DEG C. followed by quenching in water, and of the treatment of such a hard alloy with sulphur at about 500 DEG C. to form cobalt sulphate followed by immersion in water to form hydrated cobalt sulphate which by increasing in volume causes disintegration of the alloy. Hard alloy constituents recovered in this way may be reused in the production of further hard alloy compositions.
GB2885555A1955-10-101955-10-10A method for chemically pulverizing solid material
ExpiredGB789700A
(en)
Improvements improved in the perfections to manage aggressives of insects and harmful plants based on silicates (Machine-translation by Google Translate, not legally binding)