中文摘要：

以日本柳杉（Cryptomeria japonica D．Don）为试材，采用差热分析仪（附带DSC测试配置）对经温度为80、120、160、180℃，相对湿度分别为0、40％、60％、100％（80℃时最大相对湿度为80％）过热蒸汽处理后的试件进行了测试，探讨不同温度、不同相对湿度条件对木材热稳定性的影响。结果表明：高温高压过热蒸汽处理后的木材与未处理材的热分解机理基本相同；处理木材的温度越高，木材热分解所需温度也随之增高；高温高压过热蒸汽处理材的热稳定性好于未处理材，并随处理温度的升高而提高；相同温度条件下，相对湿度较低时处理的木材．其热稳定性好于相对温度较高时处理的木材；相同相对湿度条件下，高温处理的木材，其热稳定性好于低温处理的木材。

英文摘要：

Specimens trom Japanese sugi （ Cryptomeria japonica D. Don） wood were treated with superheated steam at temperatures of 80, 120, 160, 180 degrees C and relative humidity of 0, 40 percent, 60 percent, 100 percent （the highest relative humidity at 80 degrees C was 80 percent）. The effects of temperature and relative humidity on the thermal stability of wood were examined by differential scanning calorimetry. Results showed that the thermal decomposition mechanism of wood treated with superheated steam under high temperature and pressure was similar to that of untreated wood. The thermal decomposition temperature increased with the temperature of the treated wood increasing. The thermal stability of the treated wood under high temperature and high pressure steam conditions was superior to that of the untreated wood, and it could be improved with the temperature of treated wood increasing. The thermal stability of the treated wood at low relative humidity was better than that at high relative humidity under the same temperature conditions, while the thermal stability of the treated wood at high temperature was better than that at low temperature under the same relative humidity conditions.