为了探讨楔入劈拉法测试耐火材料断裂能的可行性以及对测试结果产生影响的相关因素，以镁铝尖晶石浇注料为研究对象，在室温和1100℃高温下对铝镁浇注料试样分别进行了4组不同加载速率（常温下为0．3、0．5、1、2 mm·min-1，高温下为0．5、1、2、5 mm·min-1）下的劈拉断裂试验，并根据所测的荷载-裂缝张口位移曲线计算出试样的断裂能，探讨了加载速率、断裂能以及最大载荷三者的相互影响。试验结果表明：1）当加载速率增加时，常温条件下测试的最大竖向载荷呈现出逐渐增加的趋势，但是增加幅度逐渐缓慢；而高温下最大竖向荷载呈现先升高后降低的变化。2）材料的断裂能与最大荷载呈现相同的变化趋势。3）采用楔入劈拉法测定耐火材料断裂能时的加载速率应不大于0．5 mm·min-1。
The wedge splitting tests of alumina-magnesia castables specimens at room temperature and 1 100 ℃were carried out with different loading rates to investigate the feasibility of wedge splitting method used for testing the fracture energy of refractory materials and the related influencing factors of the test re-sult.The loading rates at room temperature were 0.3,0.5,1,and 2 mm·min -1,and those at 1 100 ℃were 0.5,1,2,and 5 mm·min -1.The fracture energy of every specimen was calculated from the load-crack opening displacement curve.The relationship among loading rate,fracture energy,and the maximum load was discussed.The result shows that:(1)the maximum vertical load increases gradually with the increase of the loading rate at room temperature,and its increasing amplitude decreases gradually;the maximum vertical load increases first and then decreases at 1 100 ℃;(2)the fracture energy has the same change tendency with the maximum load;(3)the maximum loading rate is 0.5 mm·min -1 when the wedge split-ting method is used to test the fracture energy of refractory materials.
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