Laser selective melting cobalt chromium alloy false tooth infrared heating annealing heat treatment method

A laser selective melting and annealing heat treatment technology, applied in the field of heat treatment, can solve the problems of long holding time, slow heating rate, low heat treatment efficiency, etc., and achieve the effects of short holding time, fast heating speed and high heat treatment efficiency

Active Publication Date: 2020-05-19
无锡德润堂贸易有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, resistance wire heating is mostly used for annealing heat treatment of parts through convective heat transfer. Generally, the heating rate is only 10-20°C / min, and it takes about 2 hours to keep warm. Therefore, there is a heating rate through conventional resistance wire heating. Slow, long holding time and other problems, resulting in low heat treatment efficiency

Method used

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  • Laser selective melting cobalt chromium alloy false tooth infrared heating annealing heat treatment method
  • Laser selective melting cobalt chromium alloy false tooth infrared heating annealing heat treatment method
  • Laser selective melting cobalt chromium alloy false tooth infrared heating annealing heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An infrared heating annealing heat treatment method for cobalt-chromium alloy dentures formed by laser selective melting. Firstly, according to the process parameters recommended by the 3D printer manufacturer, cobalt-chromium alloy dentures are formed by laser selective melting. The process parameters are shown in Tables 1 and 2 below, respectively.

[0025] The cobalt-chromium alloy denture formed by selective laser melting is annealed under vacuum, including the following steps:

[0026] Put the cobalt-chromium alloy denture formed by selective laser melting into the tubular infrared heating furnace, evacuate to -0.01MPa, and then perform infrared heating and annealing heat treatment on the denture. The specific process is as follows:

[0027] (1) Raise the cobalt-chromium alloy denture from room temperature to 950°C at 100°C / min;

[0028] (2) Insulate at 950°C for 15 minutes;

[0029] (3) Heating is stopped, and the furnace is cooled to 300° C., taken out from the...

Embodiment 2

[0035] Example 2: Effect of Maximum Temperature on Deformation

[0036] The effect of cobalt-chromium alloy stress relief annealing heat treatment is closely related to the process parameters such as the maximum heating temperature, holding time and cooling method.

[0037] Compared with Example 1, the only difference is that the cobalt-chromium alloy warped sample was raised from room temperature to 850°C, 900°C, 950°C, 1000°C and 1050°C at 100°C / min, and kept for 15 minutes. The furnace was cooled to room temperature and taken out, the warped sample was separated from the substrate by wire cutting, the deformation of the warped sample was measured with a vernier caliper, and the effect of heat treatment was observed. The specific experimental scheme is shown in Table 3.

[0038] Table 3 Experimental scheme for changing the maximum temperature

[0039]

[0040] It can be seen from Table 3 that the deformation of the warped sample in Experiment 1 was 0.12 mm, the deformati...

Embodiment 3

[0042] Embodiment 3: the influence of holding time on deformation

[0043] Compared with Example 1, the only difference is that the cobalt-chromium alloy warping sample was raised from room temperature to 950°C at 100°C / min, kept for 5min, 10min, 15min, 20min, and 25min respectively, and then cooled with the furnace to Take it out at room temperature, separate the warped sample from the substrate by wire cutting, measure the deformation of the warped sample with a vernier caliper, and observe the effect of heat treatment. The specific experimental scheme is shown in Table 4.

[0044] Table 4 changes the experimental scheme of the incubation time

[0045]

[0046] It can be seen from Table 4 that the deformation of the warped sample in experiment a is 0.26 mm, the deformation of the warped sample in experiment b is 0.07 mm, and the deformation of the warped sample in experiments c, d and e are all 0 .

[0047] In experiment a, due to the short holding time, the internal st...

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Abstract

The invention discloses a laser selective melting cobalt chromium alloy false tooth infrared heating annealing heat treatment method, and belongs to the technical field of heat treatment. The method comprises the following steps that a cobalt chromium alloy false tooth formed through laser selective melting is placed in a tubular infrared heating furnace, the cobalt chromium alloy false tooth is subjected to annealing heat treatment by adopting infrared heating, a thermal insulation temperature of infrared heating annealing heat treatment is 850-1050 DEG C, thermal insulation time of the infrared heating annealing heat treatment is 5-25 min, furnace cooling is firstly conducted to 300 DEG C, and then the tooth is taken out to be subjected to air cooling to a room temperature. Compared withthe mode that a resistance wire is used to heat the cobalt chromium alloy false tooth through convective heat transfer, the method has the advantages that due to the fact that infrared heating conducts heat transfer through radiation, a heating speed is high, the thermal insulation time is short, and the heat treatment efficiency is high.

Description

technical field [0001] The invention relates to an infrared heating and annealing heat treatment method for cobalt-chromium alloy dentures melted by laser selective area, and belongs to the technical field of heat treatment. Background technique [0002] Cobalt-chromium alloy has good mechanical properties and biocompatibility, so it is widely used in dental and other medical device fields. Selective laser melting (SLM) is a kind of additive manufacturing technology. The 3D data is layered and sliced ​​through software, and then the high-energy laser beam is used to melt the powder layer by layer to obtain dense three-dimensional solid parts. However, in the laser selective melting forming process, due to the rapid melting and solidification of the material, the temperature gradient is large, and thermal stress is easily accumulated, so that the parts are prone to deformation. Therefore, it is necessary to perform annealing heat treatment on the workpiece after selective la...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22C19/07C21D9/00B22F3/105A61L27/04
CPCC22F1/10C22C19/07C21D9/0068A61L27/045A61L2430/12B22F10/00B22F10/37B22F10/28B22F10/64B22F10/36Y02P10/25
Inventor 孟战力唐凯明马伏艮孟卫东
Owner 无锡德润堂贸易有限责任公司
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