Preparation method for Ti(C,N)-based cermet with high-entropy alloy bonder phase
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A high-entropy alloy and cermet technology, which is used in the preparation of cermet materials and the preparation of high-entropy alloy binder phase Ti-based cermets, can solve the problems of content reduction and hard phase grain growth, and achieve thermal insulation. Short time, fast heating rate, and the effect of maintaining the composition and structure of high-entropy alloys
Active Publication Date: 2018-12-18
CHENGDU UNIVERSITY OF TECHNOLOGY
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[0005] The present invention aims at the problem that it is difficult to obtain a real high-entropy alloy binder phase cermet by mixing the binder phase and the hard phase together and then carrying out conventional sintering, and the grain growth and content decrease of the hard phase also occur. Prepare the technical scheme of preparing amorphous high-entropy alloy binder phase powder first, and finally microwave sintering
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example 1
[0018] Example 1: Prepare a high-entropy alloy binder phase Ti(C,N)-based cermet according to the following steps:
[0019] (1) Preparation of amorphous high-entropy alloy powder: Weigh various raw material powders, according to atomic percentage Co:Ni:Fe:Cu:Mn=1:1:1:1:0.3; Planetary ball mill, the ball milling speed is 300r / min, the ball-to-material ratio of the ball mill is 10:1, using WC-6Co balls with a diameter of 5mm, the ball milling medium is absolute ethanol, and the amount added is 15% of the total weight of the binder phase powder , the ball milling process is filled with 0.03MPa argon gas for protection, the ball milling time is 72 hours, the ball milling is 4 hours intermittently for 20 minutes, after the ball milling is finished, it is filtered with a 400 mesh screen, dried at 92 ° C, and passed through a 100 mesh screen;
[0020] (2) Preparation of Ti(C,N)-carbide-amorphous high-entropy alloy binder phase mixture: Weigh Ti(C,N), carbide and amorphous high-entrop...
example 2
[0023] Example 2: Prepare a high-entropy alloy binder phase Ti(C,N)-based cermet according to the following steps:
[0024](1) Preparation of amorphous high-entropy alloy powder: Weigh various raw material powders, according to atomic percentage Co:Ni:Fe:Cu:Mn=1:1:1:1:1; Planetary ball mill, the ball milling speed is 380r / min, the ball-to-material ratio of the ball mill is 10:1, using WC-6Co balls with a diameter of 5mm, the ball milling medium is absolute ethanol, and the amount added is 20% of the total weight of the binder phase powder , the ball milling process is filled with 0.03MPa argon gas for protection, the ball milling time is 110 hours, the ball milling is 5 hours intermittently for 20 minutes, after the ball milling is finished, it is filtered with a 400-mesh screen, dried at 98°C, and passed through a 100-mesh sieve;
[0025] (2) Preparation of Ti(C,N)-carbide-amorphous high-entropy alloy binder phase mixture: Weigh Ti(C,N), carbide and amorphous high-entropy all...
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Abstract
The invention discloses a preparation method for a Ti(C,N)-based cermet with a high-entropy alloy binder phase. The preparation method is characterized in that firstly, an amorphous high-entropy alloybinder phase powder with Co:Ni:Fe:Cu:Mn = 1:1:1:1:(0.3-1) is prepared by using an intermittent planetary ball mill; then, the amorphous high-entropy alloy binder phase powder is mixed with a hard phase powder by using a drum-type ball mill, and the prepared mixture is still in an amorphous state; lastly, microwave sintering at 1400-1450 DEG C is performed to allow the amorphous high-entropy alloybonder phase in the cermet to be crystallized, a transition process from the amorphous state to the crystalline state and the hysteretic element diffusion effect of the high-entropy alloy restrain the dissolution of the hard phase into the binder phase, and the binder phase of the cermet is the single-phase high-entropy alloy with a face-centered cubic structure; and thus, the cermet with the high-entropy alloy bonder phase is prepared. The preparation method overcomes the problem that during the existing preparation process of a cermet with a high-entropy alloy binder phase, a Ti(C,N) hard phase dissolves in a bonder phase, so that the relative content decreases and the grains of the hard phase are prone to abnormal growth, and finally insufficient mechanical properties of a hard alloy are caused. The preparation method can be used in cutting tools, wear-resistant parts and other fields.
Description
technical field [0001] The invention relates to a method for preparing a cermet material, in particular to a method for preparing a high-entropy alloy bonding phase Ti(C,N)-based cermet, and belongs to the field of composite materials. Background technique [0002] Ti(C,N)-based cermets are based on Ti(C,N), etc., Ni / Co is used as binder, and WC, Mo 2 C, TaC and other carbides are multi-phase solid materials prepared by powder metallurgy. Since Ti(C,N)-based cermets use Ti and Ni, which are relatively abundant resources, as the main raw materials, they can save the scarce strategic resources of W and Co. At present, they have been regarded as substitute materials for traditional hard alloys and have been valued. Cermets, like hard alloys, have a structure of hard phase + binder phase. At present, many studies have been carried out on the compounding and ultra-refining of hard phases at home and abroad, but the improvement of the performance of the binder phase is relatively...
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