Ultrasonic transducer matching layer material and preparation method thereof

1 . A method for preparing matching layer materials of ultrasonic transducers, comprising following steps:

S 01 , taking the following raw materials in parts by weight: 15~34 parts of phenolic resin, 50~92 parts of alumina, 3~17 parts of graphite, 1~16 parts of carbon fiber, 1.5~5 parts of curing agent and 0.5~5 parts of lubricant;

S 02 , crushing the phenolic resin in the raw materials into powder, and then stirring and mixing evenly with other powdery raw materials;

S 03 , putting the uniformly mixed powdery raw materials into an internal mixer for mixing;

S 04 , cooling the powdery raw material after internal mixing, then placing the powdery raw material in a mold for thermoforming in a flat vulcanizing machine, and then obtaining a sheet material; and

S 05 , grinding the sheet to a preset thickness to obtain a matching layer for ultrasonic transducers;

wherein needle-like alumina powder with a particle size of 3~4 μm for the alumina is used in step S 01 .

2 . The method for preparing matching layer material of ultrasonic transducers according to claim 1 , wherein the phenolic resin in step S 01 is thermoplastic phenolic resin.

3 . The method for preparing matching layer material of ultrasonic transducers according to claim 1 , wherein the curing agent in step S 01 is hexamethylenetetramine.

4 . The method for preparing matching layer material of ultrasonic transducers according to claim 1 , wherein calcium stearate or zinc stearate is used as the lubricant in step S 01 .

5 . The method for preparing matching layer material of ultrasonic transducers according to claim 1 , wherein step S 04 comprises following steps:

S 41 , pre-pressurizing for 6~10 minutes at a pressure of 15~20 MPa;

S 42 , degassing 5~15 times, 10 seconds for each degassing;

S 43 , pressurizing for 60~90 minutes at a pressure of 20~25 MPa; and

S 44 , cooling to 30~50° C.