Method of preparing lamination dispersion strengthening platinum-base composite material
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A composite material and dispersion strengthening technology, which is applied in the field of preparing layered dispersion strengthened platinum-based composite materials, can solve the problems of air bubbles at the laminated composite interface, increase production costs, and prolong the process flow, so as to improve the bonding strength and reduce the cost of precious metals. Loss, the effect of shortening the process flow
Inactive Publication Date: 2011-03-09
SINO PLATINUM METALS CO LTD
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This invention makes the plate fully internally oxidized by thinning the thick plate, and shortens the time of internal oxidation, but at the same time, weak bonding force and interface defects appear in the laminated composite interface during th
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Embodiment 1
[0022] Configure 3000g of raw materials according to the weight percentage of ZrO20.1, Rh 5, and Pt balance, and smelt under vacuum to form ZrO-containing 2 0.1% PtRh 5ZrO 2 0.1 alloy, poured into a flat ingot with a thickness of 8×70mm, after homogenization treatment at 800-1200°C / 2 hours, hot billeting, multi-pass cold rolling, intermediate heat treatment at 800-1200°C / 0.5 hours, finish rolling to thickness It is 0.03-0.08mm.
[0023] The PtRhZr alloy strip with a thickness of 0.03-0.08mm is internally oxidized for 10-100 hours in an oxidizing atmosphere of 0.5-2MPa at a temperature of 800-1300°C to form ZrO 2 Reinforced PtRh5 sheet semi-finished products.
[0024] ZrO with a thickness of 0.03-0.08mm 2 The strengthened PtRh5 thin strip is cut into small pieces with a growth of not less than 200mm and a width of not less than 180mm. According to the thickness and size requirements of products such as crucibles or bushings, a certain amount of small pieces are stacked toget...
Embodiment 2
[0027] The difference from Example 1 is:
[0028] With the composite ingot made in embodiment 1, vacuum tightness is 10 -2 ~10 -3 Pa, pre-press first, then heat up to 1100-1300°C, pressurize to 30-60MPa, hold the pressure for 30-60min, then cool to room temperature with the furnace, and then get the material for making crucible or bushing product thickness.
Embodiment 3
[0030] The difference from Example 1 is:
[0031] With the composite ingot made in embodiment 1, vacuum tightness is 10 -2 ~10 -3 Pa, pre-press first, then heat up to 1200-1300°C, pressurize to 20-30MPa, hold the pressure for 20-50min, then cool to room temperature with the furnace, and then get the material for making crucible or bushing product thickness.
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Abstract
The invention relates to the field of preparing layered composite material by vacuum pressure sintering, particularly to a method of preparing lamination dispersion strengthening platinum-base composite material by vacuum pressure sintering. The obtained composite material has the characteristics of high relative density and few defects at the lamination interface. The method comprises the following steps: vacuum melting, rolling, internal oxidation and preparation of composite ingots by clipping. Then the ingots are heated to the temperature of 1000-1500 DEG C. at a vacuum degree of 10<-2>-10<-3>Pa and are cooled to room temperature in the furnace after being pressurized to 10-50MPa with dwell time 10-90 minutes. Products with a relative density of greater than 95% can be obtained by the pressure molding of composite ingots in the above vacuum environment. By adopting the method provided by the invention, the generation probability of air bubbles at the interface is reduced and interface jointing strength is increased. Meanwhile, the anti-creeping property of dispersion strengthening platinum-base composite material at high temperature is also improved. The present invention solves the problems of low interface jointing strength, more defects at the lamination interface, long technological process and high cost of products prepared by traditional hot pressing method, thus is applicable to the preparation of dispersion strengthening platinum-base composite material of high relative density and few defects at the lamination interface.
Description
technical field [0001] The invention relates to a method for preparing composite materials, in particular to a method for preparing layered dispersion-strengthened platinum-based composite materials. Background technique [0002] Platinum-based materials have been used as high-temperature structural materials because of their high melting point, high-temperature creep resistance, and strong corrosion resistance, especially in the glass preparation industry. At present, there are three main methods for preparing dispersion-strengthened platinum-based composites: powder metallurgy, co-precipitation, and internal oxidation. Among them, the powder metallurgy method is to prepare the alloy powder containing the strengthening phase through smelting, powder making, internal oxidation and other processes, and is prepared through powder molding, sintering, forging and rolling; the difference between the co-precipitation method and the powder metallurgy method is that it adopts The p...
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