Phosphor raw material and method for producing alloy for phosphor raw material
A phosphor and raw material technology, applied in the field of phosphor raw materials, can solve problems such as unestablished mass production technology, low boiling point, and difficulty in obtaining alloys
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Embodiment 1
[0262]
[0263] Weigh each metal so that the metal element composition ratio becomes Al:Si = 1:1 (molar ratio), and use a graphite crucible to melt the raw material metal in a high-frequency induction melting furnace under an argon atmosphere, and then cast it from the crucible to a metal mold , and solidified to obtain an alloy (master alloy) in which the metal element composition element ratio is Al:Si=1:1.
[0264]
[0265] The master alloy and other raw material metals were weighed so that Eu:Sr:Ca:Al:Si=0.008:0.792:0.2:1:1 (molar ratio). Vacuum the furnace to 5×10 -2After Pa, stop the exhaust, and fill the furnace with argon to a predetermined pressure. Melt the master alloy in the calcium oxide crucible, then melt Sr, add Eu and Ca, and stir the molten metal obtained by melting all the components by induction current. After confirming that the molten metal is stirred, transfer the molten metal from the crucible The mixture was cast in a water-cooled copper mold (pl...
reference example 1
[0279]
[0280] The plate alloy lump obtained in Example 1 is pulverized into a median diameter D in a nitrogen flow 50 20 μm, obtain alloy powder, fill the alloy powder into a boron nitride disk, and place it in a hot isostatic pressing device (HIP), and exhaust the vacuum in the device to 5×10 -1 After Pa, heat to 300°C, and continue vacuum exhaust at 300°C for 1 hour. Thereafter, 1 MPa of nitrogen gas was filled, the pressure was released to 0.1 Pa after cooling, and nitrogen gas was filled again up to 1 MPa, and this operation was repeated twice. Thereafter, the internal pressure of the device was maintained at 190MPa, while heating to 1900°C at a temperature increase rate of 10°C / min, and kept at this temperature for 1 hour, thereby obtaining the target composite nitride phosphor Sr 0.792 Ca 0.2 AlSiN 3 :Eu 0.008 .
[0281] As a result of powder X-ray diffraction measurement of the obtained phosphor, it was found that the CaAlSiN 3 Orthorhombic crystal phase of th...
Embodiment 2
[0286] In the manufacture of the alloy for phosphor raw materials in Example 1, except that each metal and the master alloy were weighed so that the metal element composition ratio was Eu:Sr:Al:Si=0.008:0.992:1:1, the same method as in Example 1 was used. Alloys were produced under the same conditions.
[0287] For this alloy, ICP method is used for composition analysis, and the result is consistent with the composition of the feed. Therefore, it can be considered that all elements from Eu to are uniformly distributed.
[0288] The powder X-ray diffraction pattern of the obtained alloy is shown in FIG. 8 . In Figure 8, the dotted line with the index indicates that Sr(Si 0.5 al 0.5 ) 2 peaks, the dotted line without index indicates Al 2 Si 2 Sr peak. The same is true in FIG. 9 .
[0289] As shown in Fig. 8, the obtained alloy has the main phase and Sr(Si 0.5 al 0.5 ) 2 Similar powder X-ray diffraction pattern. In addition, it can be confirmed from FIG. 8 that the ob...
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Abstract
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