Study On Atmospheric Pressure Sintering Of Several Carbon-containing Auxiliaries Boron Carbide Ceramics

Boron carbide ceramic is a new type of ceramic with many excellent properties.Due to its properties of high hardness,low density,good thermal stability,abrasive resistance and good performance of absorbing neutron,boron carbide is widely applied in the field of Engineering Technology.However,because of its strong covalent bonds,it becomes extremely difficult to achieve densification sintering under low temperature.This thesis,based on the study of sintering boron carbide ceramic under pressure-free condition by adding carbonaceous sintering additives,finds that:1.Both the density and hardness of boron carbide sample sintered under 2200 degree centigrade by adding 4%w.t glucose additives,are higher than that of pure boron carbide sample sintered under 2250 degree centigrade.Glucose additives has the effect of reducing the temperature of sintering and improving the properties of products.In the process of sintering,liquid-phase sintering is also observed.2.Both the density and hardness of boron carbide sample sintered under 2200 degree centigrade by adding 4%w.t activated carbon additives,are higher than that of pure boron carbide sample sintered under 2250 degree centigrade.Activated carbon additives has the effect of reducing the temperature of sintering and improving the properties of products.3.Good densification of boron carbide sample sintered under 2100 degree centigrade by adding 4%w.t graphite additives additives is obtained,but the hardness is low.The density and hardness of boron carbide sample sintered under 2200 and 2250 degree centigrade are very low.Graphite additives doesn't have the effect of reducing the temperature of sintering and densification.