Gradient composite ceramic tool material and preparation method thereof
A technology of composite ceramics and tool materials, applied in the field of gradient composite ceramic tool materials and its preparation, can solve the problems of low flexural strength and fracture toughness, limit the application range, etc., achieve high flexural strength and fracture toughness, and broad application prospects , Improve the effect of surface hardness
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Embodiment 1
[0020] To prepare a gradient ceramic tool with a layer thickness ratio of 0.3 and a layer number of 3, the specific preparation steps are as follows:
[0021] Ingredients: The following table shows the mass percentages (wt%) of the total 2 groups of mixed powders of L1 and L2
[0022]
[0023] Put the mixed powder of each layer into the ball milling tank respectively, use tungsten carbide balls as the balls and absolute ethanol as the medium for ball milling for 48-60 hours, dry the milled suspension at 110°C for 24-48 hours, pass through a 200-mesh sieve, Through the powder quality control layer thickness, put the powder into the graphite inner sleeve in the order of L2-L1-L2 and pre-press layer by layer, pave and fill until the required number of layers, and then put the graphite inner sleeve into the vacuum hot-press sintering furnace. Raise the temperature to 1310°C at a rate of 50°C / min, apply a pressure of 20MPa and keep it for 5min, then raise the temperature to 1620...
Embodiment 2
[0026] To prepare a gradient ceramic tool with a layer thickness ratio of 0.6 and a layer number of 5, the specific preparation steps are as follows:
[0027] Ingredients: The following table shows the mass percentages (wt%) of the three groups of mixed powders of L1, L2, and L3
[0028]
[0029] Put the mixed powder of each layer into the ball milling tank respectively, use tungsten carbide balls as the balls and absolute ethanol as the medium for ball milling for 48-60 hours, dry the suspension after ball milling at 100°C-110°C for 24-48h, pass 200 Mesh sieve, through the powder quality control layer thickness, put the powder into the graphite inner sleeve in the order of L3-L2-L1-L2-L3 and pre-press layer by layer, pave and fill until the required number of layers, and then put the graphite inner sleeve into In the vacuum hot-pressing sintering furnace, the temperature was raised to 1310°C at a rate of 50°C / min, and a pressure of 20MPa was applied for 5 minutes, and then...
Embodiment 3
[0032] To prepare a gradient ceramic tool with a layer thickness ratio of 0.3 and a layer number of 7, the specific preparation steps are as follows:
[0033] Ingredients: The following table shows the mass percentages (wt%) of 4 groups of mixed powders of L1, L2, L3, and L4
[0034]
[0035] Put the mixed powder of each layer into the ball milling tank respectively, use tungsten carbide balls as the balls and absolute ethanol as the medium for ball milling for 48-60 hours, dry the suspension after ball milling at 100°C-110°C for 24-48h, pass 200 Mesh sieve, through the powder quality control layer thickness, put the powder into the graphite inner sleeve in the order of L4-L3-L2-L1-L2-L3-L4 and pre-press layer by layer, until the required number of layers, and then graphite Put the inner sleeve into a vacuum hot-pressing sintering furnace, raise the temperature to 1310°C at a rate of 50°C / min, apply a pressure of 20MPa and keep it for 5min, then raise the temperature to 165...
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