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The Effect Of Oxygen Content In Binders On The Performance Of Diamond Saw Blades

June 14,2023

The oxygen content in the binder powder and its effect on the performance of the saw blade were analyzed using nitrogen/oxygen automatic analyzer and sEM, XI Mountain and other methods. The results showed that during the sintering process, the binding agent with high oxygen content strongly eroded thediamond. Many pits have formed on the surface of diamonds, ultimately leading to a significant increase in the proportion of overall diamond fragmentation during the cutting process, resulting in a sharp decrease in tool life and efficiency.

Wear of Diamond Saw Blade Metal Powder with Oxygen Content

Metal bonded diamond tools are widely used in drilling, sawing, and grinding tools, mainly for processing hard and brittle non-metallic materials such as granite, cement, ceramics, etc. In the process of manufacturing metal bonded diamond tools, diamonds are mainly affected by three factors: the composition of the bond, sintering temperature, and holding time. Bullen studied the effects of temperature and binder composition on the strength and weight loss of diamonds. Unfortunately, the experiment was heated without atmosphere protection, which is far from the actual production process; In addition, the experiment did not consider the effect of oxygen content in the powder itself on the performance of diamond. Kanstatl∥2。 During the hot pressing of cobalt powder, others found that an increase in oxygen content in the drill powder can inhibit grain growth during the sintering process of cobalt powder, hinder the fcc-hcp phase transition of cobalt during cooling, and improve the hardness of the sintered body. However, the latter’s research did not involve the effect of oxygen content in the powder on the performance of diamond tools.

The main purpose of this study is to promote a better understanding of the impact of oxygen content in the binder powder on the mechanical properties and usability of diamond saw blades.

1. Experimental method

Using a 200 mesh reduced iron powder, reduced cobalt powder, and reduced nickel powder; -300 mesh atomized tin powder; One 300 mesh electrolytic copper powder. Mix the powder in a certain proportion (with iron and copper content greater than 35 III%) and perform ball milling. Then expose the powder to air for pre oxidation treatment (time is 60 days). The pre oxidized powder is divided into two batches, one of which is subjected to hydrogen reduction treatment. Finally, the powder is mixed with diamond and sintered in a graphite mold by hot pressing. To ensure comparability of the experimental results, the quality, concentration, and sintering conditions of the diamond used in the experiment are the same. The oxygen content of the powder is measured using the Daiichi 436 nitrogen/oxygen automatic analyzer produced by Liko Company in the United States; The morphology, composition, and phase analysis of the samples were performed using the Landachi X-650 scanning electron microscope, Pv 9900 energy spectrometer, and X-3014 X-ray diffractometer, respectively. The bending strength test was conducted on the IJ-300A material testing machine, with a sample span of 14.5 meters. The hardness test was conducted on the Hwl87.5 Brinell hardness tester. The cutting equipment is a cJc-5c cutting machine, with a main power of 18kW and a saw blade linear speed of 35 seconds. The cutting method is forward cutting. The diameter of the saw blade is 350mm. The grinding ratio of the saw blade and the diamond wear state on the surface of the saw blade were statistically and classified according to references [3,4].

2. Analysis and Discussion

With the increase of oxygen content in the powder, the strength and hardness of the bond increase, while the trend of change in bending strength after adding diamond is opposite. This indicates that an increase in the oxygen content of the powder within a certain range is beneficial for sintering, but an increase in oxygen content has an adverse effect on the bonding between the bond and diamond.

The cutting efficiency and lifespan of sample 2 with high oxygen content significantly decreased; The proportion of broken diamonds has significantly increased, while the proportion of intact diamonds has sharply decreased; That is to say, with the increase of powder oxygen content, the fragmentation of diamond during the cutting process is greatly accelerated, ultimately leading to a decrease in cutting efficiency and cutting life.