CN1256455C - TiC/Al High Damping Composite Material and Its Preparation Technology - Google Patents

Abstract

The present invention relates to a high-damping TiC/Al composite material and a preparation technology thereof, which belongs to the field of materials. The composite material of the present invention comprises the components by the weight percentage: 4 to 5.3% of Cu, 0.15 to 0.35% of Ti, 0.3 to 1% of Mn, 0 to 0.25% of Cd, 0 to 0.3% of V, 0 to 0.2% of Zr, 0 to 0.06% of B, 0.1 to 20% of TiC and Al as the rest. The technology of the present invention comprises the following procedures: prefabricated blocks of the high-damping composite material containing TiC particles are synthesized by a high-temperature vacuum reaction sintering method; after aluminium ingots are added to the prefabricated blocks for complete melt, a melt is covered by a covering agent, and the dried prefabricated blocks of the high-damping composite material are added to the melt; after the prefabricated blocks are completely melted, the melt is agitated, and Cu, Ti and Mn, or Cu, Ti, Mn and Cd, or Cu, Ti, Mn, Cd, V, Zr and B are added to the melt for adjusting chemical compositions; after being made to stand, the melt is poured in an ingot mould to obtain the in-situ synthesis high-damping TiC/Al composite material. The room-temperature damping of the present invention can reach the range of a high-damping material, the room-temperature tensile strength is obviously enhanced, and the present invention lies a favorable foundation for developing structural-functional materials.

Description

TiC/Al High Damping Composite Material and Its Preparation Technology

technical field

The invention relates to a high damping composite material and its preparation process, in particular to a TiC/Al high damping composite material and its preparation process. belongs to the field of materials.

Background technique

Compared with traditional metal materials, metal matrix composites have excellent properties such as high specific strength, specific stiffness, good wear resistance, and low expansion coefficient. Therefore, metal matrix composites are considered to have good application potential. For certain dynamic structures in the fields of aviation, aerospace, automobiles, and electronics industries, the vibration and noise need to be strictly controlled, which puts forward higher requirements on the damping performance of materials. The failure analysis statistics of rockets and satellites show that about three Two out of 10 failures are related to vibration and noise. Damping materials and technology are the most effective methods to control structural resonance and noise. Damping materials are the foundation and core of damping technology, and are a research field that is highly valued internationally.

The damping performance and strength of metal materials are a pair of contradictions, that is, the strength of the material will be reduced while the damping is increased. After literature search, it was found that Cheng Hefa et al. published "Damping Properties of Gr/Al Composite Materials" in "Mining and Metallurgy Engineering" 2002, 22(2): 103-106. This article introduced the preparation of Gr/Al by pressurized seepage process Composite materials, the damping performance of the composite materials prepared by this method has reached the requirements of high damping materials under certain test conditions, but the addition of graphite particles has little contribution to the improvement of the strength of the material, and cannot well realize the structure-function material. Effective combination.

Contents of the invention

The object of the present invention aims at the above-mentioned deficiencies in the prior art, to provide a TiC/Al high damping composite material and its preparation process, so that it can obtain a high-strength, high-damping aluminum-based composite material containing TiC particles in situ, for The basis for further development of structural-functional materials is laid.

The present invention is achieved through the following technical solutions. The in-situ self-generated TiC/Al high-damping composite material of the present invention has the following components by weight percentage: Cu4-5.3%, Ti0.15-0.35%, Mn0.3-1%, Cd0 ~0.25%, V0~0.3%, Zr0~0.2%, B0~0.06%, of which TiC0.1~20%, the rest is Al.

The present invention covers the aluminum melt with a covering agent and prepares the in-situ self-generated TiC/Al high damping composite material by stirring casting and remelting dilution, including the following steps:

(1) Synthesize a high-damping composite material prefabricated block containing TiC particles by high-temperature vacuum reaction sintering method;

(2) After the aluminum ingot is completely melted, the covering agent is added to cover the melt, and the dried high damping composite material prefabricated block is added;

(3) Stir after the prefabricated blocks are all melted;

(4) Add Cu, Ti, Mn or Cu, Ti, Mn, Cd or Cu, Ti, Mn, Cd, V, Zr, B to adjust the chemical composition, and pour it into the ingot mold after standing still to obtain in-situ autogeneous TiC/ Al high damping composite material.

In the method of the present invention, the covering agent includes: KCl, NaCl, MgCl ₂ , MgCl ₂ ·KCl, Na ₂ SiF ₆ , Na ₃ AlF ₆ , NaF, KF.

In step (2), the melting temperature of the aluminum ingot is between 680°C and 750°C, the adding temperature of the prefabricated block is between 680°C and 900°C, and the prefabricated block is kept and dried at 150°C to 250°C for 2 to 5 hours.

In step (3), the stirring speed is 200-400 rpm, the stirring time is 10-30 min, and the stirring temperature is 680°C-900°C.

In step (4), the resting temperature of the melt is 680° C. to 780° C., and the resting time is 10 to 30 minutes.

The process of the present invention utilizes the high-damping composite material prepared by stirring casting and remelting dilution. The in-situ self-generated TiC particles and Al have a good coherent effect, and can effectively refine the grains; its room temperature damping value has reached the category of high-damping materials. And its tensile strength at room temperature has been significantly improved, laying a good foundation for further development of structural-functional materials.

Detailed ways

The following examples are provided in conjunction with the contents of the present invention, and the present invention is further understood:

Example 1

The preparation composition is Cu5.3%, Ti0.15%, Mn0.3%, Cd0.25%, V0.3%, Zr0.2%, B0.06%, of which TiC0.1%, and the rest is Al for high damping Composite materials, the process is as follows:

After the aluminum ingot is melted, add KCl, NaCl, Na ₃ AlF ₆ covering agent to cover, the melt temperature reaches 900°C, add the prefabricated block of high damping composite material that has been heat-preserved and dried at 250°C for 2 hours, and after the prefabricated block is completely melted, use a stirring device to Stir at a stirring speed of 400 rpm for 10 min, and a stirring temperature of 900°C. After adding Cu, Al-Ti, Al-Mn, Cd, V, Zr, B to adjust the chemical composition, after standing at 780°C for 10 minutes, pour it into the ingot mold to obtain the TiC/Al high damping composite material. Cut the obtained composite material into damping samples of 50mm×5mm×1mm, and measure the damping value of the prepared in-situ self-generated TiC/Al high damping composite material Q ^-1 = 9×10 ³ ~ 50×10 ^-3 by DMTA; room temperature The tensile strength is 440-500MPa.

Example 2

The preparation composition is Cu4.8%, Ti0.35%, Mn1%, wherein TiC10%, the rest is Al high damping composite material, the process is as follows:

After the aluminum ingot is melted, add KF, MgCl ₂ ·KCl covering agent to cover, the melt temperature reaches 790°C, add the prefabricated block of high damping composite material that has been heat-preserved and dried at 200°C for 3.5 hours, and after the prefabricated block is completely melted, use the stirring device to rotate at 300rpm Stir at a rotating speed for 20 minutes, and the stirring temperature is 790°C. After adding Cu, Al-Ti, Al-Mn alloys to adjust the chemical composition, after standing at 730°C for 20 minutes, pour it into the ingot mold to obtain the in-situ self-generated TiC/Al high damping composite material. The obtained composite material was cut into damping samples of 50mm×5mm×1mm, and the damping value Q ^-1 of the prepared high damping composite material was measured by DMTA = 9×10 ^-3 ~ 48×10 ^-3 ; the tensile strength at room temperature was 460～550MPa.

Example 3

The preparation composition is Cu4%, Ti0.2%, Mn0.6%, wherein TiC20%, the rest is Al high damping composite material, the process is as follows:

After melting the aluminum ingot, add MgCl ₂ , Na ₂ SiF ₆ , and NaF covering agent to cover, the melt temperature reaches 680°C, add high-damping composite prefabricated blocks that have been heat-preserved and dried at 150°C for 5 hours, and use a stirring device after the prefabricated blocks are completely melted Stir for 30 min at a stirring speed of 200 rpm, and the stirring temperature is 680°C. After adding Cu, Al-Ti, Al-Mn alloy to adjust the chemical composition, after standing at 680°C for 30 minutes, pour it into the ingot mold to obtain the TiC/Al high damping composite material. The obtained composite material was cut into damping samples of 50mm×5mm×1mm, and the damping value Q ^-1 of the prepared high damping composite material was measured by DMTA = 10×10 ^-3 ~ 49×10 ^-3 ; the tensile strength at room temperature was 480～550MPa.

Example 4

The composition is Cu5%, Ti0.2%, Mn0.4%, Cd0.15%, V0.15%, Zr0..1%, B0.03%, of which TiC15%, the rest is Al high damping composite material, The process is as follows:

After the aluminum ingot is melted, add KCl, NaCl, MgCl ₂ covering agent to cover, the melt temperature reaches 800°C, add the prefabricated block of high damping composite material which has been heat-preserved and dried at 250°C for 2 hours, and after the prefabricated block is completely melted, use a stirring device at a speed of 400rpm Stir at a rotating speed for 10 minutes, and the stirring temperature is 800°C. After adding Cu, Al-Ti, Al-Mn, Cd, V, Zr, B to adjust the chemical composition, after standing at 730°C for 15 minutes, pour it into the ingot mold to obtain the TiC/Al high damping composite material. Cut the obtained composite material into damping samples of 50mm×5mm×1mm, and measure the damping value Q ^-1 of the prepared in-situ self-generated TiC/Al high damping composite material by DMTA = 8×10 ^-3 ~ 53×10 ^-3 ; The tensile strength at room temperature is 440-530MPa.

Claims (6)

1. A TiC/Al high damping composite material, characterized in that its composition weight percentage is composed of: Cu 4-5.3%, Ti 0.15-0.35%, Mn 0.3-1%, Cd 0-0.25%, V 0- 0.3%, Zr 0~0.2%, B 0~0.06%, of which TiC 0.1~20%, the rest is Al. 2. A preparation process for the TiC/Al high damping composite material according to claim 1, characterized in that the aluminum melt is covered with a covering agent and the in-situ self-generated TiC/Al high damping is prepared by stirring casting and remelting dilution Composite materials, including the following steps: (1) Synthesize a high-damping composite material prefabricated block containing TiC particles by high-temperature vacuum reaction sintering method; (2) After all the aluminum ingots are melted, cover the melt with a covering agent, and add a prefabricated block of high damping composite material after drying; (3) Stir after the prefabricated blocks are all melted; (4) Add Cu, Ti, Mn or Cu, Ti, Mn, Cd or Cu, Ti, Mn, Cd, V, Zr, B to adjust the chemical composition, and pour it into the ingot mold after standing still to obtain in-situ autogeneous TiC/ Al high damping composite material. 3. The preparation process of TiC/Al high damping composite material according to claim 2, characterized in that the covering agent includes: KCl, NaCl, MgCl ₂ , MgCl ₂ ·KCl, Na ₂ SiF ₆ , Na ₃ AlF ₆ , NaF, KF. 4. The preparation process of TiC/Al high damping composite material according to claim 2, characterized in that in step (2), the melting temperature of the aluminum ingot is between 680°C and 750°C, and the adding temperature of the prefabricated blocks is at 680°C Between ～900℃, the prefabricated blocks are dried at 150℃～250℃ for 2～5 hours. 5. The in-situ self-generated TiC/Al high damping composite material preparation process according to claim 2, characterized in that, in step (3), the stirring speed is 200-400rpm, the stirring time is 10-30min, and the stirring temperature is 680°C ~900°C. 6. The preparation process of TiC/Al high damping composite material according to claim 2, characterized in that in step (4), the resting temperature of the melt is 680°C-780°C, and the resting time is 10-30min.