A kind of phosphorescent magnetic powder and its preparation method and a kind of phosphorescent magnetic particle detection liquid
A magnetic particle detection and phosphorescence technology, applied in chemical instruments and methods, luminescent materials, material magnetic variables, etc., can solve problems such as lack, and achieve the effect of strong magnetism, high quality, and easy defect observation.
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Embodiment 1
[0044] A kind of phosphorescent magnetic powder, phosphorescent magnetic powder passes through in SrAl 2 o 4 The luminous powder is coated with magnetic materials, such as figure 1 As shown, the specific form is a large SrAl 2 o 4 Luminous powder particles contain several small magnetic material particles. However, the existing fluorescent magnetic powder uses a large particle of magnetic material to coat the surface of several small particles of fluorescent powder. In the preparation process of this existing fluorescent magnetic powder, the amount of magnetic material particles is generally guaranteed to be redundant, but this Proportioning mode In the phosphorescent magnetic powder of this embodiment, there will be a phenomenon that a large number of redundant magnetic material particles cannot be coated in the luminous powder, so that in the actual defect detection, the magnetic material in the defect has a small luminous intensity and is not Easy to observe defects. A...
Embodiment 2
[0049] A kind of phosphorescent magnetic powder of the present embodiment, the phosphorescent magnetic powder passes through SrAl 2 o 4 Inner coated nano-Fe 3 o 4 powder prepared in which nano-Fe 3 o 4 Powder particle diameter is 1nm ~ 100nm, SrAl 2 o 4 The particle diameter of luminous powder is 500 mesh to 800 mesh.
[0050] The reason why the above two materials are selected to prepare phosphorescent magnetic powder is because although the iron-cobalt-nickel alloy magnetic material has strong magnetism, it is difficult to obtain due to the complicated preparation process, and the corresponding cost is relatively high, while Fe 2 o 3 Magnetic properties of the powder without nano-Fe 3 o 4 The powder is high, and because of the large particles of SrAl 2 o 4 Luminous powder has good luminous effect and low cost.
[0051] What is even more unexpected is that through a large number of experiments, it was unexpectedly discovered that nano-Fe 3 o 4 Powder and SrAl 2...
Embodiment 3
[0053] This embodiment provides a kind of preparation method of phosphorescent magnetic powder, and phosphorescent magnetic powder passes through SrAl 2 o 4 The luminous powder is coated with a magnetic material, and this example uses SrAl 2 o 4 Luminous Powder and Nano Fe 3 o 4 Powder as an example, other luminous powders and magnetic materials as described in Example 1 will not be described here one by one. In this example, nano-Fe was prepared by chemical co-precipitation method before coating. 3 o 4 Powder, the specific steps are as follows: the FeCL 3 ·6H 2 O and FeSO 4 ·7H 2 O is mixed according to the substance ratio of 2:1 and then added 300ml H 2 O, electromagnetic stirring in an oil bath, control the pH value of the reaction solution to 11 with 28%wt ammonia water, and control the temperature to 80°C. After reacting for 1h, separate by magnetic precipitation, wash with absolute ethanol and water several times to make the supernatant liquid appear neutral. T...
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