METHOD FOR INCREASING YIELD OF STAPLE FOOD CROP

摘要

It is an object to provide a high velocity gas spraying apparatus that can extend the service life of a thermal-sprayed coating thermal-sprayed onto a molten metal-resistant member. The high velocity gas spraying apparatus has a spray nozzle for spraying a combustion gas and a thermal spraying material supply section for supplying thermal spraying particles into the combustion gas flowing inside the spray nozzle. The high velocity gas spraying apparatus is characterized in that the thermal spraying material supply section includes a thermal spraying material supply port that is formed in an inner surface of the spray nozzle at a position within 30 mm from an end of the spray nozzle.