Oxygen solid-solution titanium sintered material with both strength and plasticity and preparation method thereof
A technology of sintered materials and solid solution titanium, which is applied in the field of materials, can solve the problems of a large amount of time, low output, and difficulty in commercial scale production, and achieve the effects of low cost, overcoming technical prejudice, and simple process
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Embodiment 1
[0039] The anatase titanium dioxide powder and titanium powder were uniformly mixed by ball milling. The conditions of ball milling and mixing were as follows: steel balls with a diameter of 2.0 mm were used to mill for 1 hour at a frequency of 60 Hz with a ball-to-powder ratio of 2:1; among them, titanium dioxide The ratio of the total mixed powder oxygen dosing is added according to the mass ratio of 1%, 1.5%, and 2%, respectively.
[0040] The mixed powder was then sintered into blocks using a spark plasma sintering system, where the sintering target temperatures were 950°C, 1000°C, and 1050°C, the heating rate was 50°C / min, and the pressure was 30MPa. The temperature was kept at the target temperature for 1 hour, and then cooled under vacuum. . The vacuum condition is 10 -3 Pa, and finally the mixed powder consolidates into an almost completely dense sample.
Embodiment 2
[0051] The mixed powder of titanium and titanium dioxide that has been ball-milled for 1h is used, and titanium dioxide is added at 1.5% of oxygen atoms. The spark plasma sintering process is as follows: pre-press powder to 30MPa, hold for 1h, heat up to the specified sintering temperature at a heating rate of 100°C / min, and keep hold. The specified sintering temperatures are 900°C, 950°C, 1000°C and 1050°C. Other processing steps and parameters are the same as in Example 1.
[0052] Table 2 is the density of the sintered material of the mixed powder at different sintering temperatures. When the sintering temperature is 900°C, its density is 4.471g / cm 3 , as the sintering temperature rises to 950°C, the density increases to 4.466g / cm 3 . Afterwards, as the sintering temperature continued to increase to 1000°C, the density increased rapidly to 4.485g / cm 3 , the relative density reaches 99.6%, when the temperature reaches 1050°C, the density slowly increases to 4.491g / cm 3 ...
Embodiment 3
[0058] Samples with different oxygen contents were prepared by using the same sintering process parameters, and sintered into blocks, and other process steps were the same as in Example 1. The process parameters are: pre-press the ball-milled mixed powder to 30MPa, keep the temperature at 1000°C for 1 hour at a sintering speed of 100°C / min, and the oxygen doping amounts are 0at.%, 1.0at.%, 1.5at.% and 2.0 at.%. It is known that the atomic radius of oxygen atoms is approximately equal to the volume of the octahedral interstitial spaces in a hexagonal close-packed (HCP) Ti lattice. Therefore, solid dissolved oxygen tends to remain in the octahedral positions of the a-Ti lattice, thus acting as a stabilizer for α-Ti.
[0059] Figure 13 The XRD results at 1000 °C under different oxygen contents all confirmed that only Ti phase exists in the above samples. Additionally, it is generally known that the presence of oxygen solutes in the octahedral interstitials enlarges the c-axis...
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Abstract
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