Summary of the invention
Purpose of the present invention is exactly to provide a kind of dimensional precision height, equipment cost and die cost low ceramic lock pin based on zirconium oxide and manufacturing process thereof for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of ceramic lock pin based on zirconium oxide is characterized in that, the composition of this lock pin comprises and contains 3mol%Y
2O
3ZrO
2And AL
2O
3, described ZrO
2Account for 97.0~99.8% weight, described AL
2O
3Account for 0.2~3.0% weight.
Described lock pin external diameter is Ф 1.2~4.0mm, and centre hole is 0.115~0.20mm, and concentricity is 30~60 μ m, and volume density is 5.8~6.1g/cm
3
A kind of manufacturing process of ceramic lock pin based on zirconium oxide is characterized in that, it comprises following processing step:
(1). earlier with composition for containing 3mol%Y
2O
3ZrO
297.0~99.8% weight powder carries out pre-burning under 700~1100 ℃, add AL then
2O
30.2~3.0% weight obtains compound, adds the oleic acid or the stearic acid that account for this mixture volume 1~10% again and carries out the ball milling mixing, sieving obtains the zirconium white powder;
(2). zirconium white powder that step (1) is obtained and moulding wedding agent are by 25~50: 40~110 volume ratio is mixed, and carries out mixingly then under 40~110 ℃ of temperature, and described moulding wedding agent can be paraffin or blended wax;
(3). the mixed zirconia ceramics raw material of step (2) is made ceramic lock pin based on zirconium oxide through LPIM in mould, injecting forming temperature is 40~110 ℃, and forming pressure is 0.2~1.0Mpa, and molding time is 5~15 seconds.
In the described step (2), the zirconium white powder is 28~50: 50~70 with the preferable mixed volume ratio of moulding wedding agent, and preferable melting temperature is 60~80 ℃.
In the described step (3), injecting forming temperature is preferably 60~80 ℃, and forming pressure is preferably 0.4~0.9Mpa, and molding time is preferably 10~15 seconds.
Compared with prior art, the present invention has the following advantages and effect:
1. ceramic lock pin based on zirconium oxide dimensional precision height of the present invention, after organism took off row, burns till, the dimensional precision of goods can reach the listed index of table one:
Table one ceramic lock pin based on zirconium oxide dimensional precision index
The specification precision |
Blank of cored spare before the precision work | After the lock pin precision work |
Concentricity | ????30~50μm | ????≤1μm |
The diameter of bore tolerance | ????±3μm | ????Φ125+0.001/-0 |
The external diameter tolerance | ????±0.02mm | ????Φ2.4990±0.0005 |
Length tolerance | ????±0.5mm | ????SC:10.5±0.05 ????ST:12.7±0.05 |
2. low pressure molding ceramic lock pin based on zirconium oxide biscuit of the present invention, blank density is even, is out of shape for a short time, and after organism took off row, burns till, volume density can reach 6.02~6.06g/cm
3, hardness can reach HRA88.
3. the injection pressure of ceramic lock pin based on zirconium oxide manufacturing process of the present invention is lower, can reduce mould and equipment cost greatly.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
A kind of ceramic lock pin based on zirconium oxide, its composition are Y-PSZ:ZrO
2(contain 3mol%Y
2O
3) 99.5% weight, AL
2O
30.5% weight.
The low head injection manufacturing process of above-mentioned ceramic lock pin based on zirconium oxide, this technology comprises the following steps:
(1) with ZrO
2(contain 3mol%Y
2O
3) powder of 99.5% weight inserts in the electric furnace, through 850 ℃ of pre-burnings, the ratio in 0.5% weight adds AL again
2O
3Mix compound, add oleic acid and mix by 2% of this mixture volume through 12 hours ball milling, it is standby to obtain the zirconium white powder after 100 mesh sieves.
The refined waxs of (2) zirconium white powder and the moulding wedding agent that step (1) is obtained---52~55 degree were with 32: 68 mixed, and are mixing down at 70 ℃.
(3) mixed zirconia ceramics raw material is made ceramic lock pin based on zirconium oxide through LPIM in mould, injecting forming temperature is 60 ℃, and forming pressure is 0.2~1.0Mpa, 0.4~0.9Mpa preferably, and molding time is 5~15 seconds.
Embodiment 2
A kind of ceramic lock pin based on zirconium oxide, its composition are Y-PSZ:ZrO
2(contain 3mol%Y
2O
3) 98% weight, AL
2O
32% weight.
The low head injection manufacturing process of above-mentioned ceramic lock pin based on zirconium oxide, this technology comprises the following steps:
(1) with ZrO
2(contain 3mol%Y
2O
3) powder of 98% weight inserts in the electric furnace, through 950 ℃ of pre-burnings, the ratio in 2% weight adds AL again
2O
3Mix compound, add oleic acid and mix by 5% of this mixture volume through 12 hours ball milling, it is standby to obtain the zirconium white powder after 100 mesh sieves.
(2) zirconium white powder that step (1) is obtained and blended wax be with 35: 65 mixed, and be mixing down at 70 ℃.
(3) mixed zirconia ceramics raw material is made ceramic lock pin based on zirconium oxide through LPIM in mould, injecting forming temperature is 60 ℃, and forming pressure is 0.2~1.0Mpa, 0.4~0.9Mpa preferably, and molding time is 5~15 seconds.
Embodiment 3
A kind of ceramic lock pin based on zirconium oxide, its composition are Y-PSZ:ZrO
2(contain 3mol%Y
2O
3) 99.7% weight, AL
2O
30.3% weight.
The low head injection manufacturing process of above-mentioned ceramic lock pin based on zirconium oxide, this technology comprises the following steps:
(1) with ZrO
2(contain 3mol%Y
2O
3) powder of 99.7% weight inserts in the electric furnace, through 950 ℃ of pre-burnings, the ratio in 0.3% weight adds AL again
2O
3Mix compound, add stearic acid and mix by 10% of this mixture volume through 12 hours ball milling, it is standby to obtain the zirconium white powder after 100 mesh sieves.
(2) zirconium white powder that step (1) is obtained and blended wax be with 35: 65 mixed, and be mixing down at 70 ℃.
(3) mixed zirconia ceramics raw material is made ceramic lock pin based on zirconium oxide through LPIM in mould, injecting forming temperature is 65 ℃, and forming pressure is 0.6Mpa, and molding time is 10 seconds.
The ceramic lock pin based on zirconium oxide dimensional precision height of the foregoing description 1,2,3 after organism takes off row, burns till, can reach the listed index of table two:
The technical indicator that table two embodiment reaches
The item description | Main component | Volume density g/cm
3 | Hardness HRA | Surface color spot μ m | Concentricity μ m | Internal orifice dimension tolerance μ m | External diameter tolerance mm | Length tolerance mm |
Touch the mark | ZrO
2 | ??6.02 ??~ ??6.06 | ??88 | <100×100 | ??30 | ???±3 | ±0.02 | ±0.5 |
Low head injection ceramic lock pin based on zirconium oxide manufacturing process of the present invention, forming pressure is 0.2~1.0Mpa, can guarantee product's dimensional precision, the ceramic lock pin based on zirconium oxide biscuit of moulding, blank density is even, is out of shape little, after organism took off row, burns till, volume density can reach 6.02~6.06g/cm
3, hardness can reach HRA88.And lower to the requirement of mould and equipment, in the production of zirconia ceramics near-net-shape, application value is widely arranged.