热线法导热分析仪TCT 426| 国内供应信息| 国内采购信息- 精彩商务贸易 ...
仪器简介:
对于耐火材料,其导热性能是一项十分重要的性质,尤其在耐火材料被用作为工业设备的衬层之时,这一性能显得尤为重要,甚而对设备结构有着决定性的影响。某些场合(如绝热材料)要求热耗低,这时便需要材料的导热系数较低;另一些场合下则恰恰需要高的导热系数(如热交换器)。国际上将导热系数 λ 定义为热流率除以温度梯度,单位 W/(m*K)。
关于耐火材料与绝热材料在高温下导热系数的测量,已建立起数种方法,热线法(ISO8894)即为其中的一种。
热线法是一种动态的,{jd1}的测量方法。使用热线法测量导热系数有多种方式,其中交叉线技术为测量线性热源(热线)的温升,平行线技术则测量与线性热源隔着一定距离的一定位置上的温升。
将热线与热电偶插入两片试样之间,从加热电流接通之时开始测量,得到温升对时间的函数,由此得出试样材料的导热系数。
另一种测量方式名为“铂电阻测温技术”或“T(R)技术”,符合ASTM-C1113标准,是将热线同时作为热源与温度传感器,通过测量其电阻的变化来得到温升数据。其导热系数的计算方法则与交叉线技术相同。
NETZSCH TCT426 包含了上述全部三种方法,通过更换预装有热线的相应的测量框,可在其间自由切换
TCT 426 - 技术参数
•    温度范围:RT ... 1500℃
•    炉体:带 12 个 Super-Kanthal 加热元件
•    升降温速率:0.01 ... 5 K/min
•    气氛:静态空气
•    热线功率:0.1 ... 50 W(在 2 个区域内功率连续可调)
•    使用热电偶测量温升
•    样品尺寸:250mm×125mm×75mm(由两片样品构成一个测试单元)
•    交叉线法、十字线法相应的测量框
•    T(R) 法的测量框(选件)

联系方式如下:
伟奥仕科技(北京)有限公司
北京市石景山区高新技术产业孵化基地      邮编:100041  
电话:(+86-10)6888 2912  
E-mail:
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