采用爆炸喷涂法揭示新型(Sm1-XGdX)2Zr2O7缓烧蚀材料隔热机理

Reveal Thermal Insulation Mechanism of the New Type Erosion Reducing Materials of (Sm1-XGdX)2Zr2O7 by Detonation Spraying

以(Sm1-XGdX)2Zr2O7为研究对象,以微晶蜡作为载体,通过14.5 mm弹道枪膛壁温度测试试验,开展(Sm1-XGdX)2Zr2O7降膛壁温度效果研究。结果表明,在不装填(Sm1-XGdX)2Zr2O7试样的条件下,14.5 mm弹道枪坡膛内壁最高温度为957℃,在装填质量比为1∶2(微晶蜡:钐钆复合物锆酸盐)试样条件下,5发坡膛内壁最高温度的平均值为869℃,降温效果明显。通过半密闭爆发冲刷试验,开展(Sm1-XGdX)2Zr2O7用量及爆炸压力对沉积层的影响研究,包括分散性及化学组成。研究结果表明,在60 MPa和2500 K条件下,随着(Sm 1-X-Gd X)2Zr 2O 7用量的增加,沉积层变厚,沉积层中存在(Sm1-XGdX)2Zr2O7且分散良好;在(Sm1-XGdX)2Zr2O7试样质量比为1∶2及2500 K条件下,随着爆炸压力的增加,沉积层变薄,沉积层中存在(Sm1-XGdX)2Zr2O7且分散良好。最终得出隔热机理为:在高温条件下,试样融化吸收部分热量,同时高压条件形成的气流携带(Sm1-XGdX)2Zr2O7高速冲刷枪管内壁,部分(Sm1-XGdX)2Zr2O7沉积到内壁,在界面结合处形成了一层均匀分布的沉积层,综合起到隔热保护作用.

(Sm1-XGdX)2Zr2O7 was taken as the research object,and microcrystalline wax was used as the carrier.The cooling barrel wall temperature effect of(Sm1-XGdX)2Zr2O7 was investigated through barrel wall temperature test of 14.5 mm ballistic gun.The results showed that the maximum temperature of inner wall was 957℃without loading(Sm1-XGdX)2Zr2O7 sample.The average value of 5 slopes maximum temperature of inner wall was 869℃with a mass ratio of 1∶2(microcrystalline wax∶(Sm1-XGdX)2Zr2O7 zirconates)sample,the cooling effect was obvious.The effects of(Sm1-XGdX)2Zr2O7 dosage and explosion pressure on the deposited layer were studied through the closed burst scour test,including dispersion and chemical composition.The results showed that the more the(Sm1-XGdX)2Zr2O7 was used,the thicker the sedimentary layer was at 60 MPa and 2500 K.(Sm1-XGdX)2Zr2O7 was existed and well dispersed in the sedimentary layer.The greater the explosion pressure,the thinner the sedimentary layer under the condition of 1∶2 mass ratio and 2500 K,(Sm1-XGdX)2Zr2O7 was existed and well dispersed in the sedimentary layer.Finally,we knew the heat insulation mechanism of(Sm1-XGdX)2Zr2O7.It absorbed part of the heat at high temperature,At the same time the air flow formed by the high pressure condition carried the(Sm1-XGdX)2Zr2O7 scours the inner wall of the gun barrel at high speed.Part of(Sm1-XGdX)2Zr2O7 was deposited onto the inner wall,a uniformly distributed sedimentary layer was formed at the interface junction which played the role of heat insulation protection in a comprehensive way.