High-temperature-resistant Cr-containing lead lithium alloy with excellent die casting performance

[0016] Example 1

[0017] A high-temperature-resistant Cr-lead-lithium alloy with excellent die-casting properties smelted at 350 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 2.1wt.%, Cr: 0.3wt.%, Nd: 0.2wt.%, Bi: 0.4wt.%, Co: 0.4wt.%, Si: 0.3wt .%, and the balance is lead. The preparation method of the alloy: add the above-mentioned raw materials into the atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heat to 350 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes; put the alloy liquid in After standing at 350°C for 10 minutes, it is cast into the equipment at the same level as the hot top for semi-continuous casting into the required square and round ingots, and the ingot moves down at a speed of 12m/min. The ingot can be used as a casting raw material for pressure casting in the subsequent process to prepare complex-shaped lead-lithium alloy castings; the final heat treatment process of these castings is: vacuum solution treatment at 218 degrees for 2.6 hours; vacuum aging treatment at 135 degrees for 1.5 hours .

[0018] The lead-lithium alloy has excellent processing performance, and the cutting speed can be 2.4 times that of the lead alloy used for common shielding materials. And it has the advantages of good fluidity, excellent filling performance, small shrinkage cavity formation tendency, and low gas absorption of molten metal. It can produce thin-walled castings with high dimensional accuracy and low surface roughness. The wall thickness of die-casting parts can reach castings with a minimum wall thickness of 1mm, and small holes with a diameter of about 0.5mm can be cast. At room temperature, the tensile strength of the alloy reaches 326MPa. The tensile strength of the lead alloy used in traditional shielding materials at room temperature is 238 MPa respectively. At 150°C, the tensile strength of the material can be maintained at 228MPa within 10 hours, while the tensile strength of traditional lead alloys has been reduced to below 100MPa at this temperature. Used in nuclear reactors in tropical environments, medical radioactive source shielding, nuclear waste disposal and other fields, it can effectively ensure the safe operation of nuclear reactor systems and improve the operating life of the systems. The weight loss of the lead-lithium alloy due to volatilization and slag formation during the smelting process is about 1.5wt.%.

[0019] Example 2

[0020] A high-temperature-resistant Cr-lead-lithium alloy with excellent die-casting properties smelted at 370 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 1.8wt.%, Cr: 0.2wt.%, Nd: 0.2wt.%, Bi: 0.4wt.%, Co: 0.4wt.%, Si: 0.3wt .%, and the balance is lead. The preparation method of the alloy: add the above-mentioned raw materials into the atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heat to 370 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes; put the alloy liquid in After standing at 370°C for 10 minutes, it is cast into the equipment at the same level as the hot top for semi-continuous casting into the required square and round ingots. The ingot moves down at a speed of 10m/min. The ingot can be used as a casting raw material for pressure casting in the subsequent process to prepare complex-shaped lead-lithium alloy castings; the final heat treatment process of these castings is: vacuum solution treatment at 218 degrees for 2.6 hours; vacuum aging treatment at 135 degrees for 1.5 hours .

[0021]The lead-lithium alloy has excellent processing performance, and the cutting speed can be 2.6 times that of the lead alloy used for common shielding materials. And it has the advantages of good fluidity, good filling performance, small tendency to form shrinkage cavities, and low metal liquid inhalation. It can produce thin-walled castings with high dimensional accuracy and low surface roughness. The wall thickness of die castings can reach the minimum wall thickness of 1mm, and the small holes with a diameter of about 0.5mm can be cast. At room temperature, the tensile strength of the alloy reaches 335 MPa. The tensile strength of lead alloys for traditional shielding materials at room temperature is 236MPa, respectively. At 150 degrees, the tensile strength of the material can be maintained at 235MPa for 10 hours, while the tensile strength of traditional lead alloys has been reduced to below 100MPa at this temperature. It is used in the fields of nuclear reactors, medical radioactive source shielding, and nuclear waste disposal in tropical environments, which can effectively ensure the safe operation of nuclear reactor systems and improve the operating life of the system. The weight loss of the lead-lithium alloy due to volatilization and slag formation during the smelting process is about 1.6 wt.%.

[0022] Example 3

[0023] A high temperature resistant Cr-containing lead-lithium alloy with excellent die-casting properties melted at 390 degrees. By weight percentage, the chemical composition of the alloy is: Li: 1.8wt.%, Cr: 0.3wt.%, Nd: 0.3wt.%, Bi: 0.4wt.%, Co: 0.5wt.%, Si: 0.4wt% .%, the balance is lead. The preparation method of the alloy: the above-mentioned raw materials are added to the induction furnace protected by the atmosphere, and a silicon carbide crucible is used; the alloy solution is formed by induction heating to 390 degrees, and the electromagnetic stirring effect is used to fully stir for about 10 minutes; After being kept at 390 degrees for 10 minutes, it was cast into the hot top level equipment for semi-continuous casting into the required square ingots and round ingots, and the ingot moving speed was 12m/min. The ingot can be used as casting raw material for pressure casting in the subsequent process to prepare lead-lithium alloy castings with complex shapes; the final heat treatment process of these castings is: vacuum solution treatment at 218 degrees for 2.6 hours; vacuum aging treatment at 135 degrees for 1.5 hours .

[0024] The lead-lithium alloy has very good processing performance, and the cutting speed can be 2.8 times that of the lead alloy used for ordinary shielding materials. And it has the advantages of good fluidity, good filling performance, small tendency to form shrinkage cavities, and low metal liquid inhalation. It can produce thin-walled castings with high dimensional accuracy and low surface roughness. The wall thickness of die castings can reach the minimum wall thickness of 1mm, and the small holes with a diameter of about 0.5mm can be cast. At room temperature, the tensile strength of the alloy reaches 332 MPa. The tensile strength of lead alloys for traditional shielding materials at room temperature is 236MPa, respectively. At 150 degrees, the tensile strength of the material can be maintained at 238MPa for 10 hours, while the tensile strength of traditional lead alloys has been reduced to below 100MPa at this temperature. It is used in the fields of nuclear reactors, medical radioactive source shielding, and nuclear waste disposal in tropical environments, which can effectively ensure the safe operation of nuclear reactor systems and improve the operating life of the system. The weight loss of the lead-lithium alloy due to volatilization and slag formation during the smelting process is about 1.6 wt.%.