Preparation method of a special composite structure riser for low pressure casting
A composite structure and low-pressure casting technology, which is applied in the direction of pipes, rigid pipes, mechanical equipment, etc., to achieve the effects of good thermal shock resistance, saving production costs, and high hardness
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[0045] Example 1
[0046] Such as figure 1 The process flow shown, the production process is as follows:
[0047] (1) The preparation of silicon nitride and silicon carbide inner and outer tubes includes the following continuous steps:
[0048] A. According to silicon carbide: silicon=70:30, weighing 2~1mm accounted for 40%, 1~0.088mm accounted for 20%, less than 0.088mm accounted for 10% of various silicon carbide raw materials and 30% silicon powder in the mixer Mix for 5-6 minutes, then add 3% of the total amount of the above-mentioned raw materials as a binder, and mix for 15-20 minutes. After drying at 60°C, the batch material is sieved, and the material between 0.1 and 2.5 mm is left to form pellets.
[0049] B. The above-mentioned pelletized batch material is subjected to cold isostatic pressing at a pressure of 140 MPa.
[0050] C. Dry the pressed tube at 200°C for 24 hours.
[0051] D. The dried tube is processed by a grinder into the required appearance size.
[0052] E. Place...
Example Embodiment
[0055] Example 2
[0056] Such as figure 1 The process flow shown, the production process is as follows:
[0057] (1) The preparation of silicon nitride and silicon carbide inner and outer tubes includes the following continuous steps:
[0058] A. According to silicon carbide: silicon=75:25, weighing 2~1mm accounted for 45%, 1~0.088mm accounted for 15%, less than 0.088mm accounted for 15% of various silicon carbide raw materials and 25% silicon powder in the mixer Mix for 5-6 minutes, then add 4% of the total amount of the above-mentioned raw materials as a binder, and mix for another 15-20 minutes. The batch material is dried at 50°C and then sieved, and the material between 0.1 and 2.5 mm is left to form pellets.
[0059] B. The above-mentioned pelletized batch material is subjected to cold isostatic pressing at a pressure of 150 MPa.
[0060] C. Dry the pressed tube at 150°C for 24 hours.
[0061] D. The dried tube is processed by a grinder into the required appearance size.
[0062]...
Example Embodiment
[0065] Example 3
[0066] Such as figure 1 The process flow shown, the production process is as follows:
[0067] (1) The preparation of silicon nitride and silicon carbide inner and outer tubes includes the following continuous steps:
[0068] A. According to silicon carbide: silicon=80:20, weighing 2~1mm accounts for 40%, 1~0.088mm accounts for 15%, less than 0.088mm accounts for 25% of various silicon carbide raw materials and 20% silicon powder in the mixer Mix for 5-6 minutes, then add 3% of the total amount of the above-mentioned raw materials as a binder, and mix for 15-20 minutes. After drying at 60°C, the batch material is sieved, and the material between 0.1 and 2.5 mm is left to form pellets.
[0069] B. The above-mentioned pelletized batch material is subjected to cold isostatic pressing at a pressure of 140 MPa.
[0070] C. Dry the pressed tube at 180°C for 24 hours.
[0071] D. The dried tube is processed by a grinder into the required appearance size.
[0072] E. Place th...
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