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US 4,396,587 AGranted
Method for manufacture of silicon nitride
AssigneeAsahi-Dow Limited
InventorsMasami Yamaguchi, Yoshirou Tajitsu, Yoshiharu Kitahama, Isamu Iwami
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AssigneeAsahi-Dow Limited
InventorsMasami Yamaguchi, Yoshirou Tajitsu, Yoshiharu Kitahama, Isamu Iwami
Estimating the term…
Silicon nitride of improved quality is obtained by using a liquid silicic acid or modified liquid silicic acid as a silicic substance and carbon in a powdered form, a precursor of carbon in a powdered form, or a precursor of carbon in the form of a solution as a carbonaceous substance, and thermally treating these raw materials in a non-oxidative atmosphere containing nitrogen. By this method, .alpha.-type silicon nitride can be easily obtained. Particularly, finely divided .alpha.-type silicon nitride suitable for use as the raw material for the production of high-strength sintered articles is also produced. .alpha.-type silicon nitride whiskers useful as a reinforcing material for ceramic and metallic articles is also obtained.
A method for the manufacture of silicon nitride having a particle diameter of at most 1.5 microns which comprises subjecting a homogeneous mixture of a liquid silicic acid or a modified liquid silicic acid with carbon in the form of powder or a solution to a heat treatment at a temperature of 1300.degree. C. to 1600.degree. C. in a non-oxidizing atmosphere containing nitrogen.
A method for the manufacture of silicon nitride having a particle diameter of at most 1.5 microns which comprises forming a homogeneous mixture of a liquid silicic acid or a modified liquid silicic acid with carbon in the form of a powder or a precursor of carbon in the form of powder or a solution, precipitating the mixture, and heat treating the precipitate at a temperature of 1300.degree. C. to 1600.degree. C. in a non-oxidizing atmosphere containing nitrogen.
A method for the manufacture of silicon nitride having a particle diameter of at most 1.5 microns which comprises forming a homogeneous mixture of a liquid silicic acid or a modified liquid silicic acid with carbon in the form of powder or a precursor of carbon in the form of powder or a solution, drying the mixture, and heat treating the dried mixture at a temperature of 1300.degree. C. to 1600.degree. C. in a non-oxidizing atmosphere containing nitrogen.
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