ZrO2涂层在小高炉单套风口上的试验研究

分别采用等离子喷涂两层和三层梯度隔热涂层的方法研究了梯度隔热涂层对高炉风口寿命的影响,并分别进行了工业试验。试验采用的两层结构即金属型粘结底层(Ni-Cr-Al-Y)和ZrO2陶瓷工作层;三层结构即在工作层的ZrO2涂层中配入3%～6%的CaO作为稳定剂来抑制ZrO2相变膨胀,在金属型粘结底层(Ni-Cr-Al-Y)上涂附25%Ni-Cr-Al-Y和75%ZrO2的复合粉作为中间过渡层以消除膨胀应力。两种涂层的厚度均为0.1mm。结果表明:这两种涂层结构设计都能够有效延长金属风口的寿命,使风口的寿命分别提高了1倍和3倍;但理想的涂层厚度应为0.3～0.5mm。

Experimental research on ZrO2 coating for single tuyere of small blast furnace

Effects of gradient heat insulation coating on the service life of blast furnace tuyere were researched by two-and three-layer gradients heat insulation coating method,and the commercial tests were carried out separately.The used two-layer structure is the metal intermediate layer(Ni-Cr-Al-Y)and ZrO2 ceramics working layer.Three-layer structure was got by adding 3%~6% CaO to the ZrO2 ceramics working layer as stablizer to restraining the phase transformation and expansibility of ZrO2,and coating 25% Ni-Cr-Al-Y and 75% ZrO2 compound powder on metal intermediate layer(Ni-Cr-Al-Y)as transition layer to weaken expansive stress.The thicknesses of two kinds of coating are 0.1 mm.The result indicated that:two kinds of coating structure effectively lengthened the service life of metal tuyere,which was increased by 1 time and 3 times.But the ideal coating thickness was 0.3~0.5 mm.