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采用铂铑-铂热电偶直接插入盐浴炉内测量炉温,既不受外界环境影响,测量数据又准确。但是,其金属保护管长期工作在1270～1300℃之间的高温条件下,帮命很短,极易氧化,极易腐蚀。我们经过多次试验,选用低碳钢棒料加工成3～3.5mm厚的管子,经过渗铝,可大大提高抗氧化性,抗腐蚀性。含有铝金属的介质分解后产生的活性原子吸收到被渗金属的基体表面,再经过扩散处理后,逐渐渗于金属晶格内,形成铝层,此时渗铝层表面含量达
Platinum and rhodium - platinum thermocouple directly into the salt bath furnace temperature measurement, both from the external environment, the measurement data and accurate. However, its metal protective tube long-term work between 1270 ~ 1300 ℃ under the high temperature conditions, help life is very short, extremely easy to oxidation, highly corrosion. After many tests, we choose to use low carbon steel bar processed into 3 ~ 3.5mm thick pipe, after aluminizing, can greatly improve the oxidation resistance, corrosion resistance. The active atoms generated after the decomposition of the medium containing aluminum metal are absorbed into the surface of the substrate to be infiltrated and then diffused into the metal lattice to form an aluminum layer,