A hafnium boride-silicon carbide-graphite-tantalum silicide composite ceramic heating element and its preparation method
A technology of composite ceramics and hafnium boride, applied in the direction of electric heating devices, ohmic resistance heating, electrical components, etc., can solve the problems of poor thermal shock resistance and low toughness of heating bodies, and achieve high operating temperature, small thermal expansion coefficient, and anti-oxidation and excellent mechanical strength
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Embodiment 1
[0023] Example 1, the preparation process is as follows,
[0024] The first step: mixing
[0025] Use 83vol% hafnium boride, 10vol% silicon carbide, 5vol% graphite, 2vol% tantalum silicide mixed powder as the ball milling materials, and add the ball milling materials and absolute ethanol to the stainless steel lined with tetrachloroethylene in a volume ratio of 1:2 Jar, add ZrO 2 Ball milling (the ratio of ball to material is 4:1), the speed of the ball mill is 200r / min, and the milling time is 6 hours;
[0026] Step 2: Dry
[0027] In order to avoid the precipitation and stratification of the mixed slurry due to the density difference during the drying process, a rotary evaporator is required to dry the mixed slurry. The drying speed is 100r / min and the drying temperature is 40℃;
[0028] Step 3: Sintering
[0029] Before loading, apply a layer of BN (boron nitride) coating on the inner wall of the mold, put the mixed powder into the graphite mold, separate the powder from the upper an...
Embodiment 2
[0030] Example 2, the preparation process is as follows,
[0031] The first step: mixing
[0032] Use 72vol% hafnium boride, 15vol% silicon carbide, 10vol% graphite, 3vol% tantalum silicide mixed powder as the ball milling materials, and add the ball milling materials and absolute ethanol to the stainless steel lined with tetrachloroethylene in a volume ratio of 1:2 Jar, add ZrO 2 Ball milling (ball-to-material ratio is 5:1), ball mill speed is 180r / min, ball milling time is 8 hours.
[0033] Step 2: Dry
[0034] In order to avoid precipitation and stratification of the mixed slurry due to density differences during the drying process, a rotary evaporator is required to dry the mixed slurry. The drying speed is 40r / min and the drying temperature is 70°C.
[0035] Step 3: Sintering
[0036] Before charging, apply a layer of BN coating on the inner wall of the mold, put the mixed powder into the graphite mold, separate the powder from the upper and lower graphite gaskets with graphite pap...
Embodiment 3
[0037] Example 3, the preparation process is as follows,
[0038] The first step: mixing
[0039] The mixed powder of 60vol% hafnium boride, 20vol% silicon carbide, 15vol% graphite, and 5vol% tantalum silicide is used as the ball milling material, and the ball milling material and absolute ethanol are added to the stainless steel lined with tetrachloroethylene in a volume ratio of 1:2 Jar, add ZrO 2 Ball milling (ball-to-material ratio is 6:1), ball mill speed is 190r / min, ball milling time is 7 hours;
[0040] Step 2: Dry
[0041] In order to avoid the precipitation and stratification of the mixed slurry due to the density difference during the drying process, a rotary evaporator is needed to dry the mixed slurry. The drying speed is 80r / min and the drying temperature is 60°C.
[0042] Step 3: Sintering
[0043] Before charging, apply a layer of BN coating on the inner wall of the mold, put the mixed powder into the graphite mold, separate the powder from the upper and lower graphite g...
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