The thermal damage of diamond in Fe-based binder under different sintering processes was analyzed.It was found that Fe-based binder would erode the appearance of diamond and damage the crystal surface and edges of diamond with the increase of sinte-ring temperature.The static compressive strength of diamond also decreases when the sintering temperature exceeds a certain level,but the impact strength of diamond does not decrease significantly in a reasonable temperature range,which indicates that the static compressive strength can reflect the appearance damage of diamond more directly.Titani-um plating of diamond can delay the thermal damage of diamond in the Fe-base body to a certain extent and increase the temperature of diamond erosion.The damage mechanism of diamond is different in the Fe-based binder matrix with pressure sintering and free sin-tering.Under pressure sintering,the erosion of diamond appearance starts from the(111)crystal surface which is theoretically the most stable and the most difficult to e-rode.In the case of free sintering without pressure,the erosion of diamond appearance starts and extends from the easily eroded(100)crystal surface,and the damage degree is deeper.Therefore,the thermal damage of diamond is related to the pressure sintering method.
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