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US 10,662,062 B2Granted
Nanostructured silicon nitride synthesis from agriculture waste
AssigneeThe Government of the United States of America, as represented by the Secretary of the Navy
InventorsSyed B. Qadri, Bhakta B. Rath, Edward P. Gorzkowski, III
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Abstract
Si3N4 nanotubes and nanorods wherein the nanotubes and nanorods of silicon nitride are pure α-Si3N4 formed by carbothermal reduction of SiO2 from reacting agricultural husk material in heat and forming the silicon nitride nanotubes and nanorods.
Claims2
A Si3N4 nanotube and nanorod made from the steps of:
- adding agricultural husk material powder to a container;
- wherein the container is a covered boron nitride crucible;
- creating an inert atmosphere of nitrogen inside the container;
- applying heat;
- heating the agricultural husk material;
- heating the agricultural husk material to a temperature of about 1300-1500° C.;
- and
- reacting the agricultural husk material and forming silicon nitride;
- wherein the silicon nitride is nanorods with a diameter of 0.1 micron;
- wherein the nanorods of silicon nitride are pure α-Si3N4 formed by carbothermal reduction of SiO2,
- cooling the silicon nitride nanorods to room temperature;
- transferring the silicon nitride nanorods to an Al2O3 crucible;
- and
- heating the silicon nitride nanorods in the Al2O3 crucible in a furnace;
- wherein the step of heating the silicon nitride nanorods in the Al2O3 crucible in a furnace is at 700° C. in O2;
- and
- wherein the step of heating the silicon nitride nanorods in the Al2O3 crucible in a furnace at 700° C. in O2 eliminates excess carbon via O2 purification.
14 more elements
A Si3N4 nanotube and nanorod made from the steps of:
- washing husks in distilled water;
- pulverizing husks into fine husk powder using high energy mill with stainless steel milling media;
- pressing the fine husk powder into pellets;
- heating the pellets;
- heating the pellet to a temperature of about 1300-1500° C.;
- maintaining the temperature of the pellets at about 1300-1500° C.;
- and
- cooling the pellets comprising nanorods with a diameter of 0.1 micron and nanoparticles of silicon nitride;
- wherein the nanorods of silicon nitride are pure α-Si3N4 formed by carbothermal reduction of SiO2 from reacting agricultural husk material in heat and forming the silicon nitride nanorods.
6 more elements
Dependencies are inferred from the claim text.