钨极氩弧焊用的喷咀必须由绝缘性能好、高温时能保持其形状和强度、耐热冲击性强的材料制成。迄今,氧化铝、铝土几乎是唯一的可选材料。然而,铝质喷咀在高温下也易烧损。氮化硅是可选作气焊咀和弧焊喷咀的一种新材料,它耐烧损、使用寿命较长。制作氮化硅喷咀,是先将硅粉与有机粘合剂的混 The nozzle for TIG welding must be made of a material that has good insulating properties and maintains its shape and strength at high temperatures and is resistant to thermal shock. To date, alumina and alumina are almost the only available materials. However, aluminum nozzles also burn easily at high temperatures. Silicon nitride is a new material that can be optionally used as a gas welding tip and an arc welding nozzle. It is resistant to burning and has a long service life. Making silicon nitride nozzle, the first silicon powder and organic binder mixed